Simple Schmitt Trigger Circuit
A 555 IC is shown configured to function as a Schmitt trigger. Inputs above and below the threshold level will turn the circuit on and off ...
Self Retriggering Timed Generator Circuit
When power is first applied to the circuit, 02 begins to charge via LED1, R3, and R4. When the voltage across C2 reaches Ul`s input trigger level, the output o...
Holiday Light Sequencer Circuit
Integrated circuit Ul (a 555 oscillator/timer) is wired as a conventional pulse generator. The frequency of the pulse generator is controlled by potentiometer ...
Digital Multiple-Gang Potentiometer Control Circuit
A 555 timer can be configured to simulate a multi-gang potentiometer by controlling the mark-space ratio. ...
Fast Pulse Detector Circuit
A fast pulse detector can be made with this circuit. A very fast input pulse will exceed the amplifier slew rate and cause a long overload recovery time....
Headlight Flasher Circuit
The headlight flasher is nothing more than a 555 oscillator/timer that`s configured as an astable multivibrator (oscillator). Its input is used to drive the ga...
Time-On Touch Switch
The circuit is built around a 555 oscillator (Ul), which is turned on when a trigger is applied by touching the touch ...
Time-Out Circuit
This circuit operates in the astable mode and at the end of the first period (up to several minutes), it produces a tone. ...
10 Minute Id Timer
Designed to automatically identify a transmitter every 10 minutes, this 555 circuit has adjustable charge and discharge ...
Simple Pulse Stretcher
A single gate (open collector, noninverting) produces a simple one-shot to produce a pulse that stretches equal to t...
Transistor Pulse Generator
Seven-V narrow pulses from 2 Hz to 50 kHz are produced by this circuit. CI through C4 provide frequency ranges i...
Negative Pulse Stretcher
U1A acts as an amplifier, which drives D2 and charges C2. U1B acts as a voltage follower. R3 and R4 determine the ...
Inexpensive Pulse Generator For Logic Troubleshooting
Built around a 555 timer IC, this pulse generator can be built into a probe for logic...
Slide Projector Auto Advance
A 4001 CMOS Quad NORgate is set up as an astable multivibrator, which drives a simple differentiator and relay...
Model Train And Slot-Car Controller
As shown, a 555 timer (Ul) is configured as an astable multivibrator (oscillator) with a 400:1 duty cyc...
Pulse-Width Modulator
This circuit allows the effective power in a load to be controlled by varying the duty cycle of the on/off ratio of l...
Low-Power Metronome
Using only 0.25 mA, this metronome is ideal for battery operation. The tempo range is 34 to 246 beats per minute. Use a...
Quick Multiconductor Cable Tester
This circuit can be used to check up to an eight-conductor cable. IC1, a 555 timer, drives decade counter...
Run-Down Clock/Sound Generator
Used in electronic roulette or dice games, this circuit produces a clock signal that initially is several te...
Reaction Timer
This circuit uses a timer to generate pulses at a 5-ms clock rate. The pulses are shifted into the shift register, one at a ...