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Timing and oscillator circuits

24" Wall Clock
28 LED clock timer
3 - 12 MHz Signal Generator
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
Experimental Base Bias Tuned VFO
Experimental DDS frequency synthesizer uses the AD9851
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
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

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