There are 79 circuit schematics available in this category. Click here for all circuit diagrams. The Last circuit was added on Tuesday, 1 November 2016.Please note some adblockers will suppress the schematics as well as the advertisement so please disable if the schematic list is empty.

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CircuitCategoryDate AddedOK?Votes 
Egg timer circuit diagram, PCB layout and assembly informationTiming Status2 vote up vote down
Simple Sine Wave Oscillator including a PCB layoutTimingSep 23, 2009Status-2 vote up vote down
Direct Digital Synthesis VFO for HF Bands - based on Analog Devices AD7009 DDS (PDF)TimingOct 05, 2009Status-1 vote up vote down
Continuous Coverage V.F.O. for H.F. (PDF)TimingOct 05, 2009Status0 vote up vote down
PCB exposure countdown timer based on an Atmel ATtiny2313TimingJun 28, 2011Status1 vote up vote down
Long Time Period Automatic TimerTimingOct 25, 2014Status0 vote up vote down
Trangular wave generatorTimingMar 23, 2015Status-1 vote up vote down
Triangle / Squarewave Generator using a 1458 dual opampTimingOct 21, 2009Status0 vote up vote down
3 - 12 MHz Signal GeneratorTiming Status1 vote up vote down
Signal Frequency Beat Frequency OscillatorTiming Status0 vote up vote down
Wide-swing Variable Crystal OscillatorTiming Status0 vote up vote down
CA4060B Timer CircuitsTimingSep 10, 2006Status0 vote up vote down
Special Function Timer Circuits (LM555)TimingSep 10, 2006Status1 vote up vote down
10MHz GPS disciplined frequency standardTimingJun 19, 2011Status0 vote up vote down
Simple WWV receiver for 10 MHz calibration signalTimingApr 12, 2014Status0 vote up vote down
DDS/PLL based VFO synthesizerTimingOct 07, 2009Status0 vote up vote down
Timer circuit based on a 14536 and 4011 CMOS chips that can be calibrated using a frequency counterTimingJan 31, 2010Status-1 vote up vote down
Audible timer that can be used as a cooking timer for roasting peanuts for exampleTimingJan 31, 2010Status0 vote up vote down
Selection of 14 oscillator circuits include sinewave, audio, logic and LED flashersTimingFeb 20, 2010Status0 vote up vote down
Function Generator Sine / Triangle / Square / Saw / Burst Sweep Noise based on PIC16F870TimingMay 16, 2010Status0 vote up vote down
455KHz oscillator using FET and 455KHz IF transformerTimingMay 25, 2012Status1 vote up vote down
Build a synchronous clock locked to the mains frequencyTimingAug 18, 2009Status0 vote up vote down
AF variable frequency generator using 555 ICTiming Status0 vote up vote down
Crystal switcher using diodesTiming Status0 vote up vote down
IC oscillator 1...30MHz using 74LS04 chipTiming Status1 vote up vote down
Simple AF-oscillator / signal generator using pair on 2N2222 transistorsTiming Status1 vote up vote down
Digital clock based on 74 series logicTiming Status0 vote up vote down
Weston Voltmeter ClockTiming Status0 vote up vote down
Binary clock using LED matrix to display a binary clock with 6 digits of 4 binary bits eachTiming Status0 vote up vote down
Digital clock that receives and displays the time from the Rugby MSF radio transmission (PIC16F877)Timing Status0 vote up vote down
Line powered 60Hz clock generator (PDF)TimingJan 26, 2001Status0 vote up vote down
Micro-power pulse generator (PDF)TimingJan 26, 2001Status0 vote up vote down
Divide by 1.5 counter (PDF)TimingJan 26, 2001Status1 vote up vote down
High-output square wave generator (PDF)TimingJan 26, 2001Status0 vote up vote down
D Flip-flot one-shot circuits (PDF)TimingJan 26, 2001Status0 vote up vote down
Equivalent circuit and SPICE model of 555 timerTimingApr 11, 2011Status0 vote up vote down
Op Amp Triangle-Wave Generator circuit diagram and SPICE simulation filesTimingJan 17, 2011Status0 vote up vote down
Wien Bridge Oscillator with SPICE simulationTimingMar 26, 2011Status-1 vote up vote down
Triangle / Square wave generatorTimingFeb 21, 2005Status0 vote up vote down
Binary clock circuit diagramTimingAug 18, 2009Status0 vote up vote down
Experimental DDS frequency synthesizer uses the AD9851TimingOct 08, 2009Status-1 vote up vote down
LED matrix clock circuit diagramTimingAug 18, 2009Status0 vote up vote down
Panel-mounting clock circuit diagramTimingAug 18, 2009Status0 vote up vote down
Sidereal clock project with circuit diagramsTimingAug 18, 2009Status0 vote up vote down
Simple Function Generator using TL084 or other opampTiming Status0 vote up vote down
Micropower pulse generator (PDF)TimingJan 26, 2001Status0 vote up vote down
Simple GPS Stabilised 10 MHz OscillatorTiming Status1 vote up vote down
DCF-77 PIC LED clock (DCF77 is the name of a German radio station on 77.5 KHz)TimingJun 27, 2010Status0 vote up vote down
24" Wall ClockTiming Status0 vote up vote down
Sleep TimerTiming Status0 vote up vote down
Super VXOTiming Status0 vote up vote down
High Precision GPS/TV controlled Reference OscillatorTimingMay 01, 2004Status0 vote up vote down
TV based Receiver for a Standard Frequency GeneratorTimingMay 01, 2004Status0 vote up vote down
AD9852 DDS schematicTimingFeb 14, 2003Status0 vote up vote down
Decimal DDS Signal GeneratorTiming Status0 vote up vote down
Build A 100Khz Crystal CalibratorTiming Status0 vote up vote down
Crystal heater / temperature stablization circuit (TXCO)Timing Status0 vote up vote down
A GPS receiver based frequency standardTimingMar 23, 2003Status0 vote up vote down
Long duration timer using 4060 12-stage binary ripple counterTimingAug 17, 2009Status0 vote up vote down
Clock generatorTimingJan 26, 2001Status0 vote up vote down
555 Timer Tutorial + CircuitsTimingJan 26, 2001Status0 vote up vote down
All-Ears QSK Timing GeneratorTimingMay 19, 2015Status-1 vote up vote down
Monostable multivibratorTimingJan 01, 2003Status0 vote up vote down
GPS-based universal clock generatorTiming Status0 vote up vote down
VCO covers 300MHz to 500MHz based on Maxim MAX2608 VCOTiming Status0 vote up vote down
Push Button Switch DebouncerTimingJan 26, 2001Status0 vote up vote down
5 to 30 Minute Timer circuit diagramTimingNov 27, 2002Status1 vote up vote down
NE555 Basic MonostableTimingNov 27, 2002Status0 vote up vote down
Clock project based on National Semincondutor MM5402NTimingJul 05, 2015Status0 vote up vote down
A universal XCO/PLL Board that replaces crystal oscillator modulesTimingJul 03, 2016Status0 vote up vote down
MEMS oscillator evaluation board for SiT8008/SiT8208/SiT8209 from SiTimeTimingJul 03, 2016Status0 vote up vote down
Homebrew DDS Generator (with AD9851) V2.0TimingJul 03, 2016Status1 vote up vote down
Perfect Sinus 1 kHz OscillatorTimingSep 07, 2016Status0 vote up vote down
600 MHz to 2.2GHz VCOTimingSep 14, 2016Status0 vote up vote down
800 MHz to 2.2GHz Push-Pull VCOTimingSep 14, 2016Status0 vote up vote down
Two-Tone Audio Generator - M0DGQTimingSep 28, 2016Status0 vote up vote down
Pure Sine-Wave Wien OscillatorTimingOct 17, 2016Status0 vote up vote down
1 kHz Quadrature OscillatorTimingOct 22, 2016Status0 vote up vote down
400 kHz - 30 MHz Low Noise X-tal Oscillator - DJ2LRTimingOct 29, 2016Status0 vote up vote down