Timing and oscillator circuits

• 10MHz GPS disciplined frequency standard
• 24" Wall Clock
• 28 LED clock timer
• 3 - 12 MHz Signal Generator
• 455KHz oscillator using FET and 455KHz IF transformer
• 5 to 30 Minute Timer
• 555 Timer Tutorial + Circuits
• A GPS receiver based frequency standard
• AD9852 DDS schematic
• AF variable frequency generator using 555 IC
• Alarm clock based on Atmel AT89C2051 and Dallas DS1307 RTC chip
• Astable 40KHz clock
• Astable Multivibrator
• Astable Multivibrator Projects / Circuit diagrams
• Audible timer that can be used as a cooking timer for roasting peanuts for example
• Bedside lamp timer
• Binary clock
• Binary clock using LED matrix to display a binary clock with 6 digits of 4 binary bits each
• Build A 100Khz Crystal Calibrator
• Build a synchronous clock locked to the mains frequency
• CA4060B Timer Circuits
• Cheap 40KHz clock using one gate of a 74C14
• Clock divider
• Clock doubler
• Clock generator
• CMOS oscillator using 74C14 inverting Schmitt trigger
• Collection of timer circuit diagrams to generate very long delays
• Constant Reactance Voltage Controlled Oscillator (PDF)
• Continuous Coverage V.F.O. for H.F. (PDF)
• Countdown timer with relay
• Crystal 32.768KHz CMOS Oscillator
• Crystal heater / temperature stablization circuit (TXCO)
• Crystal oscillator using a CMOS or HCMOS inverter
• Crystal switcher using diodes
• D Flip-flot one-shot circuits (PDF)
• D.I.Y. Clock Oscillator based on 555 timer
• DCF-77 PIC LED clock (DCF77 is the name of a German radio station on 77.5 KHz)
• DCF77 PIC16F84A Single-Nixie clock (DCF77 is the name of a German radio station on 77.5 KHz)
• DDS oscillator based on an Analog Devices AD9859 and an Atmel ATmega16 microco (Microsoft Word)
• DDS using AD9835
• DDS/PLL based VFO synthesizer
• Decimal DDS Signal Generator
• Digital clock based on 74 series logic
• Digital clock that receives and displays the time from the Rugby MSF radio transmission (PIC16F877)
• Digital Clock with Alarm Using DS1307
• Digital Stopwatch 0-60sec
• Digital Stopwatch 0-99sec
• Digital timer with 7-segment display and pushbuttons
• Direct Digital Synthesis VFO for HF Bands - based on Analog Devices AD7009 DDS (PDF)
• Divide by 1.5 counter (PFD)
• Egg timer
• Equivalent circuit and SPICE model of 555 timer
• Experimental Base Bias Tuned VFO
• Experimental DDS frequency synthesizer uses the AD9851
• Extended counter using CD4017
• Frequency Tripler using the CA3028 (PDF)
• Function Generator Sine / Triangle / Square / Saw / Burst Sweep Noise based on PIC16F870
• Giant nixie clock
• GPS-based universal clock generator
• HCMOS Gates Make Frequency multipliers (PDF)
• High Precision GPS/TV controlled Reference Oscillator
• High-output square wave generator (PDF)
• Homemade scope clock using a DG7 tube and a Microchip PIC16F876
• IC oscillator 1...30MHz using 74LS04 chip
• Ice Tube Clock - Vacuum fluorescent display (VFD) clock
• LED matrix clock
• Line powered 60Hz clock generator (PDF)
• Long duration timer using 4060 12-stage binary ripple counter
• Low Distortion Crystal Oscillator (PDF)
• Micropower pulse generator (PDF)
• Micro-power pulse generator (PDF)
• Mixer VXO circuit diagram
• Monostable multivibrator
• NE555 Basic Monostable
• Op Amp Triangle-Wave Generator circuit diagram and SPICE simulation files
• Oscilloscope CRT Clock
• Panel-mounting clock
• PCB exposure countdown timer based on an Atmel ATtiny2313
• Photo timer circuit using NE555
• PTT Delay Circuit
• Push Button Switch Debouncer
• 'Rounding Off' a square wave
• Selection of 14 oscillator circuits include sinewave, audio, logic and LED flashers
• Sidereal clock project with circuit diagrams
• Signal Frequency Beat Frequency Oscillator
• Simple AF-oscillator / signal generator using pair on 2N2222 transistors
• Simple Divide-By-N using 161 series chip (PDF)
• Simple Function Generator using TL084 or other opamp
• Simple GPS Stabilised 10 MHz Oscillator
• Simple Sine Wave Oscillator including a PCB layout
• Single-digit Nixie clock
• Sleep Timer
• Special Function Timer Circuits (LM555)
• Square wave oscillator using CMOS 4011 NAND chip
• Square wave to sine wave converter
• Sun tanning timer
• Super VXO
• Switch debounce using 555
• Time Delay Relay using 4011 CMOS NAND gate
• Time Delay Relay using 555 timer
• Timer circuit based on a 14536 and 4011 CMOS chips that can be calibrated using a frequency counter
• Tiny Crystal Oscillator using LP2980 (PDF)
• Triangle / Square wave generator
• Triangle / Squarewave Generator using a 1458 dual opamp
• Tuning VFOs With A PN-Junction
• TV based Receiver for a Standard Frequency Generator
• Two nixie display clock
• Unusual frequency dividers (PDF)
• VCO - Voltage Controlled Oscillator covers around 70-210 MHz
• VCO covers 300MHz to 500MHz based on Maxim MAX2608 VCO
• VFD (vacuum flourescent display) clock
• Weston Voltmeter Clock
• Wide-swing Variable Crystal Oscillator
• Wien Bridge Oscillator with SPICE simulation