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Monostable multivibrators – Circuit Schematic
Monostable multivibrators
We`ve already seen one example of a monostable multivibrator in use: the pulse detector used within the circuitry of flip-flops, to enable the latch portion for...
Traffic Lights For Model Cars Or Model Railways – Circuit Schematic
Traffic Lights For Model Cars Or Model Railways
Kids these days seem to have most things you see in the toy shops, so if you have a son or grandson who has a collection of cars, here is something he will real...
PWM Modulator – Circuit Schematic
PWM Modulator
If you ever thought of experimenting with pulse-width modulation, this circuit should get you started nicely. We`ve kept simplicity in mind and used a dual 555 ...
Push Off Push On – Circuit Schematic
Push Off Push On
The ubiquitous 555 has yet another airing with this bistable using a simple push-button to provide a push-on, push-off action. It uses the same principle of the...
One second Audible Clock Circuit Schematic – Circuit Schematic
One second Audible Clock Circuit Schematic
This accurate one-pulse-per-second clock is made with a few common parts and driven from a 50 or 60 Hertz mains supply but with no direct connection to it. A be...
Long-Interval Pulse Generator – Circuit Schematic
Long-Interval Pulse Generator
A rectangular-wave pulse generator with an extremely long period can be built using only two components: a National Semiconductor LM3710 supervisor IC and a 100...
Grand Prix Starting Lights – Circuit Schematic
Grand Prix Starting Lights
This circuit reproduces the starting light sequence currently used by FISA for Formula One racing. It could be used with slot car sets (such as HO scale AFX/Lif...
Egg Timer – Circuit Schematic
Egg Timer
This egg timer, which is both simple and functional, shows once again that it is not essential to use a microcontroller for everything these days. The circuit c...
Cheap Pump Controller – Circuit Schematic
Cheap Pump Controller
This simple but effective circuit can be used to control water level in a container. The prototype is used to pump water out of a bucket that collects condensat...
Amplifier Timer Circuit Schematic – Circuit Schematic
Amplifier Timer Circuit Schematic
This circuit turns-off an amplifier or any other device when a low level audio signal fed to its input is absent for 15 minutes at least. Pushing P1 the device ...
LED Flasher Circuit – Circuit Schematic
LED Flasher Circuit
The 555 timer chip is a very versatile IC, because when connected correctly, it can it can create pulses of current at specific time intervals decided by the re...
555 Pulse Generator – Circuit Schematic
555 Pulse Generator
The first positive pulse from a classic 555-based oscillator is always 1. 6 times longer than the following pulses. The difference is caused by the fact that on...
The 555 Monostable – Circuit Schematic
The 555 Monostable
The 555 timer is so named because its primary mode of operation is intended to be in monostable mode. Operating as a monostable, it does not fit the strict defi...
Clocks – Circuit Schematic
Clocks
Clocks have been mentioned in the preceding section with regard to their action with FFs. You will recall that this circuit is a timing signal generated by the ...
electronic dice – Circuit Schematic
electronic dice
The 555 astable board uses a 555 timer in its astable configuration. This means that it outputs a square wave or a series of high and low signals. The speed tha...
Pulse Circuits for Infrared LEDs and Visible Diode Lasers – Circuit Schematic
Pulse Circuits for Infrared LEDs and Visible Diode Lasers
This article demonstrates basic circuits for pulsing infrared LEDs and low power visible semiconductor lasers using components which are inexpensive and fairly ...
74121 IC Description TTL Monostable Multivibrator IC – Circuit Schematic
74121 IC Description TTL Monostable Multivibrator IC
The 74L121 and 74L122 ICs pin out diagram works any any style 74xx121 or 74xx122 DIP chip, but the timing graphs are only valid for the TTL families indicated. ...
Pulse shape – Circuit Schematic
Pulse shape
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Pulse Duration Modulator circuit description – Circuit Schematic
Pulse Duration Modulator circuit description
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555 timer ic operation – Circuit Schematic
555 timer ic operation
The 555 Timer is an integrated circuit used as a timer, a pulse generator, tone generator and many other circuit functions, all from one universal IC function. ...