A collection of over 1100 circuits yo

u can build, from audio, power supplies,
testing, video.
 

Sample

 
      Alarm  Securitys
1chip burglar alarm   
Alarm_Circuits-Circards_13   
Alarm_-_Car   
Alarm_-_Loop_Sensor   
Alarm_-_Touch_Triggered   
Alarm_-_Universal_System   
Alarm_-_Warning_Strobe_Flashers   
Alarm_Circuits_-_Circards_13   
Auto alarm   
Burglar alarm 2   
Burglar alarm   
Semiconductor fail safe alarm   
Single ic auto alarm   
 
     Amplifiers
15v chopper amp   
2-30 Mhz 140w amature radio lienear amp   
20W audio amp   
28 db noninverting amp   
29 Mhz amp   
50w audio power amp   
6w audio amp with preamp   
80w 3-30 12 5 - 13 5v amp   
Absolute value notron amp   
AC coupled dynamic amp   
Active clamp limiting amp   
Audio power amp   
Broadcast band RF amp   
Cascaded amp   
Class D power amp   
Composite amp   
Constant bandwidth amp   
Current Shunt amp   
DC stablized fast amp   
Differential amp   
Differential to single ended voltage amp   
Digital programmable precision amp   
Equalized preamp for magnet phono cartridges   
Flat responce tape amp   
Foward current booster   
Hybrid power amp   
input output buffer amp for analog multiplexers   
Intrinsically safe protection op amp   
Inverting amp   
Inverting programmable gain amp   
Low noise photodiode amp   
Magntic phono preamp   
Miniature windband amp   
record preamp   
Noninverting amp   
Noninverting programmable gain amp   
Output stage power booster   
Photodiode amp   
Polarity reversing low power amp   
Portable amp   
Programmable amp   
Programmable gain differential input amp   
Summing amp   
Tape playback amp   
Two Pole NAB type preamp   
Voltage follower amp for signal supply operation   
Wide range digitally controlled variable gain amp   
Wind band AGC amp   
Windband 500 khz 1 ghz hybrid amp   
Windband uhf amp with high performance fets   
Write amp   
 
      Audio
10 band octave equalizer   
siren   
2 tone siren   
2 way intercom   
20 db audio booster   
3 band active tone control   
4 channel mixer   
555 beep transformer   
AGC with squelch control   
Audio amp   
Audio circuit bridge load drive   
Audio_Generators-How_They_Work   
Audio_Oscillator_With_Dfm_Option   
Audio_Test_Station   
Audio_Tone_Vu_Meter   
Auto_to_Trailer_Interface   
Bidrectional intercom system   
Dolby b c noise reduction system   
Dolby b noise reduction circuit 2   
Dolby b noise reduction circuit   
Electronic bagpipe   
Electronic siren   
Extended play circuit   
Gain controlled stereo amp   
Hands off intercom   
Hee Haw siren   
IC preamp tone control   
Input buffered mixer   
Intercom   
Line operated amp   
Linear IC siren   
Magnetic phono preamp   
Micro sized amp   
Microphone amp   
Mini stereo   
Personal pocket pager 2   
Personal pocket pager   
professinal audio nab tape playback preamp   
RIAA preamp   
Rumble scratch filter   
Signal combiner   
Simple mixer   
Siren   
Sound activated switch   
Sound actived tape switch   
Speaker amp for hand held transceivers   
Steam train with whistle   
Super sound generator   
TV audio amp   
Universal mixer stage   
Voice operated switch   
Voltage controlled attenuator   
Wailing siren   
Wien bridge filter   
Yelping siren   
 
     Automotive
Auto air conditioner smart clutch   
Auto headlight delay   
Auto ingition substitute   
Auto locater   
Auto voltage regulator   
Automatic_Parts_Tray   
Back up beeper   
Calibrated tachometer   
CAR_LOCATOR.gif
Courtesy light delay switch   
Courtsey light extender   
Delayed extra brake light   
Digital tach dwell meter   
Directional signals monitor   
Door ajar monitor   
Electronic car horn   
Flashing 3 brake light   
Headlight alarm   
Lights on reminder   
Low freq tachometer   
Read head preamp   
Tachometer with set point   
Tachometer   
 
     Battery
9v battery life extender   
Auto battery alternator monitor   
Automatic shutoff for battery powered project   
Batter splitter 2   
Battery capacity tester   
Battery splitter   
Battery status indicator   
Battery voltage monitor   
Battery_Charger_-_1_hour_battery_charger   
Battery_Pack_Capacity_Indicator   
Electric vehicle battery saver   
Gel cell charger   
Lead acid battery charger   
Lead acit low battery detector   
Lithium battery charger   
Lithium batterys state of charge indicator   
Low battery dector   
Low battery indicator   
Low battery protector 2   
Low battery protector   
Low battery tester 2   
Low battery warning - disconnector   
Low battery warning desconnector   
Low battery warning   
Nicad battery analyzer   
Nicad battery protection circuit   
Nicad battery zapper 2   
Nicad battery zapper   
Portable nicad battery charger   
Put battery charger   
Quickly deactivating battery sensor   
Rapid battery charger for ICOM   
Step up switching regularot for 6v battery   
Thermally controlled nicad charger   
UJT battery charger   
Universal battery charger 2   
Universal battery charger   
 
     Clock timers flash pulse
1 2 ghz frequency counter   
1 mospower fet analog switch   
1 shot timer   
10 mhz frequency counter   
12v latch   
2 state neon oscillator   
3 minute timer   
3 year LED flasher   
300v pulse generator   
40 Mhz universal counter   
5 lamp neon flasher   
60w flashing light   
AC Flasher   
AC solid state relay   
Adjustable delay   
Alternating LED Flahser 2   
Alternating LED flasher   
Astable multivibrator   
Basic track and hold sample and hold   
CMOS flasher   
CMOS precision programmable laboratory timer   
CMOS short pulse generator   
Current monitor   
Digital clock with alarm   
Electronic time delay   
Filtered sample and hold   
Frequency counter preamp   
Hall effect compass   
Hall effect switch   
High speed sample and hold   
Hold current limiter   
Incandescent light flasher   
Inverting sample and hold   
Lamp flasher   
Leading edge delay   
Logic pulser   
Long time timer   
Low cost frequency counter   
Low power wide range
Minimum component flasher   
On off inverters   
Power consumptin limiter   
Pulse delay with dual edge trigger   
RF power switch   
Ring around LED flasher   
Sample and hold 2   
Sample and hold 3   
Sample and hold 4   
Sample and hold   
SCR chasser   
SCR Flasher   
SCR replacing latching switch   
SCR ring counter   
Security door ajar alarm   
Sequential timer   
Simple time dalay   
Single lamp flasher   
Smoke detector   
Switch debouncer   
Timing threshold and load driver   
Track and hold sample and hold   
Transistor flasher   
Up down counter extreme count freezer   
Variable strobe light   
Very low duty cycle pulse generator   
Voltage contriller pulse width generator   
Wide range pulser   
 
1 5 w offline converter   
1 hz to 1 25 mhz voltage to freq converter   
1 hz to 10mhz voltage freq converter   
1 hz to 30 hmz voltage to frequency converter   
10hz to 10khz v f converter   
12 to 16 v converter   
12vdc to 117vac at 60hz power inverter   
2 function signal generator   
2 simple temperature to time converters   
3 25 v dc dc converter   
4 18 mhz converter   
4 channel comparator   
4 output waveform generator   
5 khz to 2mhz voltage to freq converter   
50 mhz theral rms to dc converter   
A-D_Converter-1_Digit   
A-D_Converter-Low_Cost   
A-D_Converter-Tracking_Sample_&_Hold   
A-D_Converter_-_10Bit_Fast_Serial_Output.zip
A-D_Converter_-_8_Bit   
A-D_Converter_-_Clockless   
A-D_Converter_-_Low_Resolution_BCD_3_Bit   
A-D_Converter_-_Tracking_Sample_&_Hold_Type   
A-D_Converter_with_Switching_Pre-amp   
A-D_Conveter_-_8Bit_With_Output_Current-To-Voltage_Convers~1.zip
Accurate voltage to freq converter   
Astable mulitvibrator   
Astable   
Basic function generator   
Buck booste converter   
Classic op amp astable multivbrator   
Comparator latch   
Complementory output variagle freq inverter   
Differntial input voltage to freq converter   
Direction detector decoder   
Dual limit microvold compartor   
Dual output 12 or 15v dc dc converter   
Easily tuned sine wave sqare wave generator   
Efficient supply splitter   
Encoder decoder   
Fixed frequency generator   
Frequency detecting comparator   
Frequency to voltage converter   
Function generator 2   
Function generator   
Harmonic generator   
HiFi compressor with pre emphasis   
High efficiency flybck voltage converter   
Isolated 15v dc dc converter   
Linear ramp monostable   
Linear trangle wave timer   
Low cost fsk generator   
Low cost voltage to freq converter   
Low frequency converter   
Low frequency fm generators   
Low frequency multivibrator   
Low voltage compander   
Medium power inverter   
Microold comparator with hysteresis   
Monostable multivibrator   
Monostable operation   
Non integer programmable pulse driver   
Oscillator clock generator   
Percise triangle square wave generator   
Pin photodiode to frequency converter   
Positive to negative converter   
Positive triggered monostable   
Power inverter   
Power mosfet inverter   
Precision audio waveform generator   
Precision comparator withbalanced inputs   
precision one shot   
Precision voltage inverter   
Preserved input voltage to freq converter   
Programmable frequency astable   
Programmable frequency free running multivibrator   
Programmable triangle square wave generator   
Pulse height to width converter   
pulse train to sinusoid converter   
Pulse width to voltage converter   
Regulated 15v out 6v driven converter   
Regulated dc dc converter   
Retriggerable one shot   
Sawtooth and pulse generator   
Second audio program adapter   
Self oscillating flyback switching converter   
Shortwave converter   
Single control functin generator   
Single OP amp clock   
Single supply multivibrator   
Sound activated decoder   
Square to sine wave converter   
Step up down dc dc converter   
Tone decoder   
Triangle generator   
Triangle square wave genrator   
Unipolar to dual supply converter   
Variable duty cycle timer   
Variable slope compressor expander   
Versatile 2  pulse generator   
Voltage ratio to frequency converter   
Voltage to freq converter   
Voltage to frequency converter   
Wide frequency TTL clock   
Wide range triangle square wave generator   
Wide range tunable function generator   
Wide range voltage to freq converter   
Wide range voltege to freq converter 2   
Window comparator 2   
Window comparator   
XOR gate complementary signal generator   
Zero ib error v i converter   
 
     Detectors Sensors
0-63 c temperature sensor   
500 hz tone detector   
AC circuit breaker   
AC power line connection monitor   
Analog peak detector with digital hold   
Audio decibel level detector with meter driver   
Capacitive sensor alarm   
Differential thermometer   
Digital frequency detector   
Digital frequency window   
Digital peak detector   
Dual liquid level detector   
Edge detector   
Electronic crowbars   
Electronic head sniffer   
Electronic thermometer   
Fast overvoltage protector   
Flood alarm or temperature monitor   
Fluid level control   
Frequency boundary detector   
Gas smoke detector 2   
Gas smoke detector   
High bandwidth peak detector   
Implantable ingestible electronic thermometer   
Isolated tempurate sensor   
Line voltage monitor   
Liquid level checker   
Liquid level monitor   
Low cost humidity sensor   
Low drift peak detector   
Low flow rate thermal flowmeter   
Methane concentration detector   
Missing pulse detector   
Multiple aperature window discriminator   
Null detector   
Out of bound pulse width detector   
Phase detector   
Phase selector phase detector   
Phase sequence detector   
Piezoelectric fan based temperature controller   
Power failure alarm   
Precision envelope detector   
Precision threshold detector   
Proportional temperature controller   
Proximity sensor   
Proximity switch   
Schmitt trigger   
SCR proximity alarm   
SCR smoke alarm   
Servo sensed heated protector   
Simple linear thermometer   
Simple window detector   
Smoke detector 2   
Smoke detector 3   
Smoke detector   
Smoke gas vapor detector   
Soil moisture meter   
Temperature controller   
Temperature measuring add on for ddm voltmeter   
Temperature reporting digital thermometer   
Thermocouple multiplex system   
Thermometer adapter   
UHF movement detector   
Water level sensor and control   
Wide bandwidth peak detector   
Wide range peak detector   
Window detector 2   
Window detector 3   
Window detector 4   
Window detector   
Zero point switching temperature control   
 
     Digital computer
1 of 15 cascaded video mux   
1 of 8 cannel transmission system   
1 of 8 channel transmission system   
12 bit binary 2s complement da conversion system   
2 level multiplexer   
20Mhz to nubus clock phase lock   
3 channel multiplexer with sample and hold   
4 channel da output amp   
5v powered eeprom pulse generator   
8 digit microprocesor display   
9 bit CMOS da converter   
ADC   
Analog multiplexer with buffered input and output   
Automatic rS232 dataselector   
Coprocessor socket degugger   
Demultiplexer   
Digital to analog converters   
Half Flash ADC   
HiFi expander with de emphasis   
Interface to 680x and 8080 families   
Logic line monitor   
Long delay line for logic signals   
Low cost 4 channel multiplexer   
Microprocessor controlled analog signal attenuator   
Multiple input detector   
Multiplying da converter   
Positive peak detector   
RGB blue box   
RS232 to CMOS line receiver   
RS232C LED Circuit   
Spare flip flop inverter   
Switched capacitor ADC   
Tracking ADC   
Transformerless tone annunicator   
XOR gate up down counter   
 
     Fiber optics  Display
2 variable LED matrix display   
50 mbs fiber optic receiver   
Fiber optic link   
Fiber optic receiver   
Fiber optic transmitter   
Low cost 100 M baud fiber optic receiver   
 
     Games
Coin flipper   
Electronic dice   
Whos first   
 
     Infared  Optical  Laser
AC relay   
Ambient light ignoring optical sensor   
Bipolar_Stepper_Motor_Drive_Circuit.zip
DC latching relay   
Digital IR transmitter   
Discrete sequence osicillator   
High voltage ac switcher 2   
High voltage ac switcher   
Indicator lamp driver   
Infared receiver   
Infared transmitter   
Infrared_Logic_Probe   
INFRARED_REMOTE_CONTROL.ZIP
INFRARED_TRANMITTER_DECODER   
IR receiver   
IR transmitter   
Laser diode pulsers   
Laser_Experiments_Errata   
Laser_Light_Shows   
Laser_Show_Pattern_Generator   
Line current detector   
Line operated power outage light   
Long range object detector   
Normally closed half wave zvs contact   
Normally open and normally clossed   
Photodiode source follower   
Simple IR detector   
Soptical CMOS coupler   
Sptical TTL coupler   
Triggering SCR series   
Visible red continous laser gun   
Voltage-Controlled_Filter_&_Oscillator   
Zero voltage switching solid state relay   
 
     Lamps Lights Motors
12V_Colour_Organ_&_Reverb   
12V_Sound_To_Light_Unit   
16_Channel_Stage_Light_Dimming_System   
2-Pre-Set_Stage_Lighting_Switch   
800w soft start light dimmer   
8w fluorewscent lamp inverter   
April_Fools_LEDs
Automatic fan speed controller   
Bridge type ac servo amp   
Christmas_Star   
Closed loop motor speed control   
Color_Organ-3_Channel   
Color_Organ___4_Channels.zip
Colour_Organ-Sheraton-Caravan_Hotel-Edmonton-1975   
Constant speed motor driver   
Contrant brightness control   
DC motor drive   
DC_Lamp_Dimmer.zip
Digi_Color_Organ   
Dimmer_Interface_For_Madison's_Night_Club_-_Vancouver_Bc   
Dimmer_Power_Board_Layout   
Dimming_Fluorescent_Lamps   
Efficent switching controller   
Electronic_Candle   
Electronic_Candle2   
Flame monitor   
Flourescent_Lamp_Dimmer   
Flourescent_Lamp_Music_Into_Light_Controller   
Flourescent_Sound_To_Light_System   
Halogen lamp dimmer   
High efficiency motor speed controller   
Lamp life extender   
Lamp_Chaser-3_Channel-Logic_Or_Low_Voltage_Only   
Led_Sequencer_Program   
Light controlled lamp switch   
Light controlled one shot timer   
Light level detector   
Light modulator   
Light sensitive audio   
Lighted display brightness control   
Lighting_Controller-Caper   
Lighting_Controller-Dale_Holland   
Lighting_Controller-Scandals_Disco   
Lighting_Controller-Verna_Rhode   
Lighting_Controller-Walt_Kowal   
Lighting_Controller_-_EH_Keith_Unit   
Lighting_Controller_R1   
Lighting_Controller_R22   
Lighting_Controller_R2A   
Lighting_Controller_R2B   
Lighting_Controller_R2B_Logic_Section   
Lighting_Controller_R3   
Lighting_Controller_R3A   
Lighting_Controller_R5   
Lighting_Controller_R6   
Lighting_Controller_R7   
Lighting_Controller_R9   
Lighting_Controller_R9_Complete_Schematic   
LIGHTMETER   
Light_Chaser_Logic   
Light_Crossfader   
Line voltage operated auto night light   
Low light level drop detector   
Microcontroller_Multichannel_Light_Dimmer   
Optical sensor to TTL interface   
Phase control 2   
Phase control   
Photoelectric AC power switch   
Pseudorandom sequencer   
Pulse width modulation lamp brightness control   
PWM motor controller   
PWM servo amp   
PWM speed control   
Servo system controller   
Solar triggered switch   
Solid state light dissolver   
Speed controlled reversible DC motor drive   
Start and run motor circuit   
Stepping motor driver   
Sun tracker   
Switched mode motor speed controller   
Tachless motor speed controller   
Triac light dimmer   
Visual_Production_&_Laser_Light_Shows   
Warning light and maker light   
 
     Miscellaneous
10_Channel_Follower   
12_Channel-2_Scene_Dimmer_System-Berlin   
1_of_4_Decoder_with_Enable   
2 terminal touch switch   
3 chip EKG simulator   
50 mhz trigger   
8_Bit_Digital_Firing_Circuit   
A-D_Encoder-Logarithmic   
AC line voltage announcer   
Accurate null variable gain circuit   
Acid rain monitor   Add on telephone hold button   
Adder   
adjustable_phase_quadrature_generator   
Air motion detector   
Allophone generator   
An_Ac_Dimmer_For_Use_With_The_Stamp   
Applause_Meter.gif
Applause_Meter   
ASSORTED_ASCII_SCHEMATICS   
Auto zeroing scale   
Bar code scanner   
Bearth monitor   
Biofeedback_Monitor-PC_based   
Breath alert alcohol tester   
Bug detector   
Bug tracer   
Burst power control   
cable_desc.zip
Call_Director   
Capacitance meter   
Carrier current am receiver   
Carrier current audio transmitter   
Carrier current fm receiver   
Carrier_Current_Rcvr-Transmitter_Set    
Cassette interface   
CD_Buddy   
Central image canceller   
Cheap_PC_Boards   
Class_D   
Closed loop tracer   
Compass-Digital.zip
Computer speech synthesizer   
Constant current stimultor   
Constant_Current_Dummy_Load   
CONTACTLESS_VOLTAGE_DETECTOR.ZIP
Controller_for_Model_Traffic_Lights   
Controlling_Stepper_Motors   
Counter_Speed_Doubler   
DARKNESS_CONTD_LIGHT_SWITCH.ZIP
Decimal_to_BCD_Converter   
Design_of_Transmission_Line_Transformers   
Determining_Transformer_Polarities   
Dial phone number vocalizer   
Dial pulse indicator   
Differential_Audio_Distortion_Analyzer   
Digital touch on off switch   
Digital_Code_Converters   
Digital_Switching_System.zip
Digital_Touch_On-Off_Switch.zip
Divide myltiply with only 1 trim   
Dmx_Booster   
Door opener   
Duplex line amp   
Dynamic noise reduction circuit   
Earthquake_Detector   
Eico_330_Rf_Generator   
Eico_369_Tv-Fm_Sweep-Marker_Generator   
Eico_379_Audio_Generator   
Electromagnetic_Levitator   
Electronic music   
Electronic telephone set   
Electronic voice substitute   
Elenco_Sg-9500_Rf_Generator   
Encoders_and_Decoders   
Fart_Strength_Meter   
Flame ignitor   
Fluxmeter_Input_For_Dmm   
Furnace_Fan_Speed_Control   
Generators-Sine_Wave-Misc   
Hands free telephone   
Heathkit_Sg-1271_Function_Generator   
Hewlett-Packard_204C-204D_Oscillator   
High freq inverting follower   
High freq noninverting follower   
High Q notch filter   
High-Performance_Dc_Voltmeter_Converter   
Hybrid_Networks   
HYDROGEN_POWER   
Infrared wireless speaker system   
Intergrator with programmable reset level   
IR_RELATED_ASCII_SCHEMATICS   
IR_RS_232_TRANSCEIVER.ZIP
IR_TYPE_DATA_LINK.ZIP
JACOB'S_LADDER   
keyboard_scanned_eight_tone_generator   
Kinetic_Images_From_Sound   
Knotted_Handkerchief   
Line activated solid state switch   
Line hum touch switch   
Line synchronized driver   
Linear-Scale_Ohmmeter   
Listening_to_Class_D   
LM567   LOGARITHMIC_LIGHT_SENSOR.ZIP
Low power RS232 driver   
Low_Cost_Dot_Bar_Generator   
LVDT driver demodulator   
Magnetic_Ball_Levitator   
Magnetic_Sensor_Experiments   
Magnetometer_Update_Article   
MICROCONTROLLER_DEVELOPMENT_THOUGHTS   
Milli-Ohm_Adapter   
Model_Train_Throttle_Control   
MODULATOR_PULSE_HEIGHT   
Motion_Detector_-_Lamp_Control_Head   
Motion_Detector_-_Micropower_Wireless_Motion_Detector   
Multivibrator-Fast_Rise_Time   
Negative triggered touch circuit   
Neon_Sequencer___12_Channel.zip
Noise limiter   
On the air indicator   
Optically interfaced ring detector   
Op_Amp_Noise   
Output limited   
pain_field_generator   
Panasonic_TR-329B_AC-DC_Portable_TV   
Parallel telephone connection   
PCB_Making_1.html
PCB_MAKING_1.txt
PCB_Making_2.html
PCB_Making_3.html
PCB_Making_4.html
PCB_Making_5.html
PCB_Making_6.html
Pc_Based_Cable_Tester   
Penncrest_5905_Stereo_Receiver   
Phone_Line_Sentinel   
Photodiode_Amplifier   
PIC_16C63_Midi_controlled_Light_dimmer.zip
PIC_Programmer   
Pink_Noise_Generator   
Polarity_Sensing_Continuity_Tester   
Positive and negative reference tracker   
Positive input negative output   
Possitive triggered touch circuit   
Power line modem   
Power_Amp_D-A_conversion   
Practical current limiting coil driver   
Practical_Surface_Mount   
Precision phase splitter   
Precision_Half-Wave_AC-DC_Converter   
Precision_Unity-Gain_Half-Wave_Rectifier   
Programmable_Theatre_Lighting_Controller   
Pulse amplitude discriminator   
Pulse dialing telephone   
Puzzled_About_Output_Transformers   
R9_Power_Board   
random_led_flasher_8_to_20_leds_ledflasher.jpeg
Rating_Power_Transformers-1953   
Receiver signal alarm   
relative_wind_angle_indicator_for_sailboats   
Remote sensor loop transmitter   
Remote telephone ringer   
REMOTE_CONTROL_JAMMER.ZIP
Remote_two_wire_positioner_   
Resetting integrator   
Reverse_ECG.txt
RF actuated relay   
RF_ICs_-_Japanese_-_Typical   
Rf_Voltmeter   
Ring detector   
Ringer relay   
SAM_S_LASER_FAQ   
Sanwa_501-Zx-Tr_Multitester   
Seed_Drill_Shaft_Monitor   
Series telephone connection   
Signal track and hold   
Signal_Injector   
Signal_Line_Tester   
Simple follower   
Simple low cost RF switch   
Simple tesla coil   
Simple touchtone generator   
Simple_Frequency_Doubler   
Sinewave_doubler   
Single chip pulse tone dialer   
Solid_State_Tesla_Coil   
Sound-to-Light_Translator   
Speakerphone   
Stage_Lighting_Controller   
Stereo indicator   
Stimulus isolator   
Strobe_Controller_R4A   
Strobe_Lights   
Strobe_Light___Variable.zip
Subtractor   
Super_Wireless_Control_   
Telco_In_A_Box   
Telephone amp   
Telephone controlled night light   
Telephone handset encoder   
Telephone recorder   
Telephone repeater   
Telephone sound level meter monitor   
Telephone speech activity detector   
Telephone tap   
Telephone-related_ASCII_Schematics   
Telephone_Tester-Off_Line.zip
Telequipment_S51B_&_S51E_Oscilloscopes   
Tesla coil   
Timer_Circuits_-_555   
Tone dialing telephone   
Totem pole driver with bootstrapping   
Touch on off electronic switch   
Touch switch 2   
Touch switch 3   
Touch switch   
Touch_Controlled_Switch-Mode   
Touch_Switch.zip
Tracer receiver   
Track and hold   
Transformers-Determining_voltage_&_current_ratings_if_unma~1   
Triangle_To_Sine_Wave_Shaper   
True_Rms_Converter   
Twin T notch filter   
Ultra_Low_Distortion_Sine_Wave_Generator   
Ungar_4624_Soldering-Desoldering_Station   
V-F_Converter_-_Linear   
Variable_Brightness_Color_Organ   
VARIABLE_DIGITAL_TIMER.ZIP
Various_Schematics_and_Diagrams   
Video_Head_Tester_Yf-225B-V_User_Manual   
Visual level indicator   
Voltage follower   
Voltage-controlled_triangle-square_Generator   
Windband signal splitter   
Wireless telephone eavesdropper   
X-Y_Plotter   
ZDS1009_High_Side_Current_Monitor   
 
      Music
Biomedical instrumentation differental amp   
Chug Chug   
Differential instrumentation amp   
doorbell_extender   
Downbeat emphasized electronic metronome   
Electronic bird chirper   
Electronic tremolo   
Fuzz box   
Ideband instrumentation amp   
Instrumenation amp   
Low power instrumentation amp   
Race carmotor crash   
Sound effects generator   
Strain guage instrumentation amp   
Thermocouple preamp   
Tremelo 2   
Tremolo 3   
Tremolo   
Ultra precision instrumentation amp   
 
      Oscillators Modulators
3 5v regulator output converter   
50 duty cycle osc   
5v osc   
Accurate ramp generator   
Audio generator   
Audio osc   
Balanced modulator   
Balanced tmos vco   
CMOS osc   
Code practice osc   
Double sideband supperessed carrier modulator   
HCU hct based osc   
High freq osc   
Intergrator ramp generator   
Last cycle completing gate osc   
Logarithmic sweep vco   
Low distortion osc   
Low freq osc   
Low voltage sien bridge osc   
Low_Distortion_Oscillator   
Modulator monitor   
Modulator   
Operational amp   
Oscillators_4011   
OSCILLATOR_SAMPLE___HOLD   
OSCILLATOR_SINE_WAVE   
OSCILLATOR_SINE_WAVE_LM3900   
OSCILLATOR_THERMISTOR   
Oscilloscope_Deflection_Amplifier   
Precision voltage controlled osc   
Programmable freq sine wave osc   
Pulse position modulator   
Pulse width modulator   
Quad osc   
RF modulator 2   
RF modulator   
Saw oscillator modulator   
Scope osc   
SCR relaxation osc   
Simple VCO   
Single supply wien bridge osc   
Super low distortion variable sine wave osc   
Supply voltage splitter   
Variable capacitance diode sparked vco   
Variable wien bridge osc   
VCO   
Waveform generator stable vco   
Wide range osc   
Wien bridge osc   
XOR gate osc   
 
Photography
Camera alarm trigger   
Darkroom enlarger timer   
Electronic Photoflash   
Flash meter   
Slave photographic xenon flash trigger   
Slide show timer   
Slide timer   
 
     Power supply
100 khz multipiple output switching power supply   
12vdc battery operated 120vac power source   
15 v 1a regulator power supply   
3 30v universal power supply   
50w off line switching power supply   
5v to isolated 5v 20 ma converter   
AC voltage regulator   
Adjustable 10a regulator   
ARC jet power supply   
ATX_Power_Supply.gif
Battery powered high voltage generator   
Bilateral current source   
Biopolar reference source   
Biquad audio filter   
Capacitor discharge high voltage gererator   
Charge pool power supply   
Digital controlled voltage reference   
Diodeless precision rectifier   
Dual tracking regulator   
Dynamic noise filter   
Efficient negative voltage regulator   
Expanded scale analog meter   
Fourth order chebyshev bandpass filter   
Fourth order chebyshev high pass filter   
General purpose power supply   
Glitch free turbo circuit   
Hand held transceiver dc adapter   
High current inductorless switching regulator   
High stability 10v regulator   
High voltage bucking regulator   
High voltage DC generator   
High voltage inverter   
High voltage regulator   
Isolated feedback power supply   
Low cost 3a switching regulator   
Low cost low dropout linear regulator   
Low dropout 5v regulator   
Low forward drop rectifier circuit   
Low power active filter   
Low power inverter   
Low power switching regulator   
minus 15v 1a regulated power supply   
Noise signals filter   
Optoisolated high voltage driver   
Positive regulator with NPN and PNP boost   
Positive regulator with PNP booster   
Power converter   
Power supply balance indicator   
Precision full wave rectifier   
Preregulated high voltage supply   
Programmable active filter   
Programmable power supply   
Regulator current source   
Remotely adjustabel solid state HV supply   
Safe constant current source   
Scratch filter   
Second order biquard bandpass filter   
Simple high voltage supply   
Simple power supply   
Single supply fault monitor   
Sixth order elliptic high pass filter   
Slow turn on 15v regulator   
State variable active filter   
State variable filter   
Switching power supply   
Three rail power supply   
Tracking pre regulator   
Triac controlled voltage doubler   
Typical active bandpass filter   
Uninterruptable 5v supply   
Variable voltage regulator   
Voltage controlled current source   
Voltage controlled filter   
Voltage doubler   
 
     Radio
1 mhz meter driver amp   
1 mhz pierce osc   
1 transistor fm transmitter   
1 w CW transmitter   
100 mhz vhr crystal osc   
10db gain amp   
120 khz 500w induction heater   
1296 mhz solid state power amp   
2 30 mhz amp   
2 gate quartz osc   
20 khz arc welding inverter 2   
20 khz arc welding inverter   
20 mhz VHR crystal osc   
450 mhz common gate amp   
50 mhz crystal osc   
565 sca demodulator   
5w 150 mhz amp   
60w 225 400 mhz amp   
80 M amateur radio transmitter   
902 mhz cw transmitter   
Active antenna 2   
Active antenna   
AM Radio   
Beacon transmitter   
Bridge trasducer amp   
Crystal controlled reflectin osc 2   
Crystal controlled reflectin osc   
Crystal timebase   
Devide by 1 5 circuit   
Digital data line receiver   
Digital freq dougler   
Easy start up crystal osc   
FM snooper   
FM tuner   
FM voice transmitter   
Freq doubler   
FSK data receiver   
Fundamental freq crystal osc   
Integrated AM receiver   
Low cost half duplexe transmission link   
Low cost line receiver   
Low freq pierce osc   
Low freq transmitter   
Marker generator   
Narrow band FM receiver   
Odd number counter divider   
Portable RF burst generator   
Pulse width multiplier   
QRP cw transceiver   
Ranging system   
RF wideband adjustable AGC amp   
Simple cmos crystal osc   
Simple ham band receiver   
Single chip freq doubler   
Sireless FM michrophone   
Sonar transducer switch   
Strain gauge signal conditioner   
Temperature comprensated crystal osc   
Tone burst generator   
TV transmitter 2   
TV transmitter   
UHF TV preamp   
Ultransonic transceiver 2   
Ultrasonic pest controller   
Ultrasonic pulsed pest controller   
Ultrasonic receiver 2   
Ultrasonic transceiver   
Ultronsonic pest repeller   
Ultronsonic receiver   
VHF modulator   
VHF tone transmitter   
Voltage controlled crystal osc   
Wireless fm michrophone 2   
Wireless FM michrophone   
 
     Testing  Monitoring
3 5 digit ad capacitance meter   
3 in 1 test set   220v test probe   
4 5 digital dvm   
8 channel voltage display   
AC voltmeter   
Ac_Millivoltmeter   
Add on scope multiplexer   
Audible logic tester   
Audio millivolt meter 2   
Audio millivolt meter   
B&k-501-A_semiconductor curve_tracer   
B&k_1248_Color_Generator   
B&k_1602_Power_Supply   
B&k_467_Crt_Restorer_Analyzer   
B&k_480_Crt_Restorer_Analyzer   
B&k_Model_1076_Television_Analyst   
Battery powered ground noise probe   
Bob_Parkers_Esr_Meter   
Cable tester   
Cable_Tester_-_Go-No_Go   
CMOS universal logic probe   
Continuity tester   
CRO doubler   
Current monitor and alarm   
DC voltmeter   
Dc_Millivoltmeter   
Dc_Voltage_Or_Current_Meter   
Digital freq meter   
Digital logic probe   
Digitizer   
Duty cycle monitor   
Electrostatic detector   
FET probe   
FET voltmeter 2   
FET Voltmeter   
Field strenght meter   
Freq meter   
Full scale 4 decade 3 5 digital dvm   
Function_Generator   
High current osc   
High input resistance dc voltmeter   
High input resistemce voltmeter   
Hot wire anemometer   
LC checker   
LED panel meter   
LED peakmeter   
Line current monitor   
Linear ohmmeter   
Low current measurement system   
Low input capacitance buffer   
Low power magnetic current sensor   
Low voltage indicator   
Motor hour meter   
Multiplexed common cathode LED display   
Nearly 50 duty cycle multivibrator   
Optical pick up tachometer   
Oscilloscope counter preamp   
Oscilloscope preamp   
Oscilloscope triggered sweep   
Over under voltage monitor   
Paper sheet discriminator   
Peak db meter   
Peak program detector   
PH probe and detector   
Picoammeter circuit   
Precision freq counter   
QRP swr bridge   
Quadrature outputs osc   
RF probe 2   
RF probe   
S meter   
Scope sensitivaty amp   
SCR tester   
Sensitive field strenght meter   
Sensitive RF voltmeter   
Signal injector 2   
Signal injector   
Simple continuity tester   
Simplified voltage level sensor   
Sound level meter   
Square wave pulse extractor   
Stabilized low input capacitance buffer   
Starecase generator   
Stereo power meter   
Stud finder   
Tachometer and direction of rotation   
UA2240 staricase generator   
Very short pulse width measurer   
Visible voltage indicator   
Voltage freezer   
Voltage level indicator   
Voltage monitor   
Wide range ac voltmeter   
Wide range RF power meter 2   
Wide range RF power meter   
 
     Video
75 ohm video pulse amp   
Automatic video switch   
Chroma demodulator with RGB matrix   
Color tv crosshatch generator   
Color video amp   
Composite video signal text adder   
DC gain controlled video amp   
General purpose video switcher   
High performance video switch   
Low distortion video buffer   
PAL-NTSC decoder with RGB input   
Picture fixer inverter   
RGB composite converter   
RGB video apm   
Single supply wide range sync separator   
Summing amp clamping circuit   
Video DC restorer   
Video gain block   
Video line driving amp   
Video signal clamp   
Video switch with very high off isolation   
Wireless video camera link