Free Open Resource Electronics Schematics

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RF Transmitter

Create RF in very Simple


Timing, oscillators etc. (schematics)

1 Second Time Base From Crystal Osc.
10 Hz to 10 Khz VCO with Square and Triangle wave
1KHz Sinewave generator
28 LED clock timer
5 to 30 Minute Timer
555 oscillator
555 time delay circuit
555 timer
555 Timer Tutorial + Circuits
A GPS receiver based frequency standard
AD9852 DDS schematic
Astable Multivibrator
Bedside lamp timer
Budget timer
Cheap 40KHz clock
Circuit that momentarily closes a pair of contacts at long intervals
Clock divider
Clock doubler
Clock generator
CMOS oscillator
Colpitts 1 to 20 MHz Crystal Oscillator
Countdown timer with relay
Crystal 32.768KHz CMOS Oscillator
Crystal oscillator
D Flip-flot one-shot circuits (PDF)
Darkroom camera shutter timer
Day / Night / 24 Hour Select Sensor
DDS using AD9835
Digital Stopwatch 0-60sec
Digital Stopwatch 0-99sec
Divide by 1.5 counter (PFD)
Divide By 1-1/2 Circuit
Generating a Delayed Pulse With a dual 555 Timer
High Precision GPS/TV controlled Reference Oscillator
High-output square wave generator (PDF)
Line powered 60Hz clock generator (PDF)
Long period timer
Low frequency clock
Low Voltage , High Current Time Delay Circuit
Micropower pulse generator (PDF)
Micro-power pulse generator (PDF)
Mini DDS (Direct Digital Synthesis)
Monostable multivibrator
NE555 Basic Monostable
Onboard Fogger Timer
One transistor timer
Photo timer circuit
Power-Off Time Delay Relay Circuit
Power-On Time Delay Relay Circuit
Push Button Switch Debouncer
`Rounding Off` a square wave
Sawtooth wave oscillator
Simple sinewave generator
Sine/Cosine wave oscillator
Square wave oscillator
Square wave oscillator
Square wave to sine wave converter
Stable 40KHz clock
Stable multivibrator (IC)
Stable multivibrator (Transistor)
Sun tanning timer
Switch debounce using 555
Time Delay Relay
Time Delay Relay
Timed beeper
Triangle wave oscillator
TV based Receiver for a Standard Frequency Generator
tw1o Transistor Sine Wave Oscillator
Variable timer
Versatile electronic timer
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