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Mono stable with 555 and relay – Circuit Schematic
Mono stable with 555 and relay
The two circuits below illustrate using the 555 timer to close a relay for a predetermined amount of time by pressing a momentary N/O push button. The circuit o...
Delaying Pulse from 555 circuit – Circuit Schematic
Delaying Pulse from 555 circuit
The circuit below illustrates generating a single positive pulse which is delayed relative to the trigger input time. The circuit is similar to the one above bu...
Relay driver with a 555 – Circuit Schematic
Relay driver with a 555
This 555 timer circuit below toggles a relay when a button is pressed. Pins 2 and 6, the threshold and trigger inputs, are held at 1/2 the supply voltage by the...
LED Traffic Lights for Games – Circuit Schematic
LED Traffic Lights for Games
This schematic uses the 555 timer and the 4017 IC to drive 3 LED, to simulate the trafic lights....
Servo controller with 555 – Circuit Schematic
Servo controller with 555
This circuit takes standard 0-10V control voltage (for example from analogue light controlling desk) and outputs a standard 1-2 ms RC servo motors control pulse...
Variable Square wave oscilator with 555 circuit – Circuit Schematic
Variable Square wave oscilator with 555 circuit
This is a very simple circuit utilising a 555 timer IC to generate square wave of frequency that can be adjusted by a potentiometer. With values given the frequ...
Over-Under Voltage Cut-Out with 555 – Circuit Schematic
Over-Under Voltage Cut-Out with 555
This over/under voltage cut-out will save your costly electrical and electronic appliances from the adverse effects of very high and very low mains voltages. T...
LED Flasher with 555 – Circuit Schematic
LED Flasher with 555
This is a very basic circuit for flashing one or more LEDS and also to alternately flash one or more LEDs. It uses a 555 timer setup as an astable multivibrato...
Simple Buzzer driver with 555 – Circuit Schematic
Simple Buzzer driver with 555
This very simple circuit just uses a couple of resistors, a capacitor and the easily available 555 timer IC. The 555 is setup as an astable multivibrator opera...
Beeper driver with 555 – Circuit Schematic
Beeper driver with 555
This circuit produces the sound of a beeper like the one in pagers which produces a "beep-beep" sound. Basically the circuit consists of a 555 timer oscillator ...
Electronic Police Siren – Circuit Schematic
Electronic Police Siren
This circuit produces a sound similar to the police siren. It makes use of two 555 timer ICs used as astable multivibrators. The frequency is controlled by th...
Electronic Siren – Circuit Schematic
Electronic Siren
This circuit produces a sound similar to a factory siren. It makes use of a 555 timer Ic used as an astable multivibrator of a center frequency of about 300Hz....
Brakelight Stop flasher – Circuit Schematic
Brakelight Stop flasher
This is basically a flasher circuit modified to turn on and off a bulb instead of a LED. It uses a 555 timer IC working as an astable multivibrator. The flashin...
HV Ignition Coil Driver using 555 – Circuit Schematic
HV Ignition Coil Driver using 555
A Simple design based on a 555 to Drive a Car Ignition Coil. I Designed this for a Small Electric Fence to Protect my Vegitable Garden from some Small Animal ca...
Emergency Pump Control with 555 – Circuit Schematic
Emergency Pump Control with 555
A simple Sump Pump Control Circuit using NE555....
Stun Gun with 555 – Circuit Schematic
Stun Gun with 555
This stun gun is powered by a 9V battery. The transformer steps up the voltage to about 1800V (but with very low current). A 555 timer IC is used to generate a ...
Timer Circuit with optocoupler – Circuit Schematic
Timer Circuit with optocoupler
A small circuit that can find a lot applications of measurement time. She has the possibility us inform with sound signal from the BZ1. At the same time, exist ...
Touch Switch with 555 – Circuit Schematic
Touch Switch with 555
The modern mechanic switches are improved concerning of old technology. We need however many times to replacement some old switch or to check currents bigger t...
2 LED Flasher with 555 – Circuit Schematic
2 LED Flasher with 555
The circuit is based on the IC1 that is 555, for the creation of alternate flashes from the two led D1-2, that can be also different colour. The frequency of a...
Clap switch using timer 555 – Circuit Schematic
Clap switch using timer 555
A single hand clap will be picked up by the electric mic which is coupled through C1 into the op amp IC1. The output of IC1 triggers the 555 IC timer IC2 which ...