Long Period SCR Timer

Posted on Feb 7, 2014

This is a SCR timer circuit. Here, SCR is used to drive the final actuator, the buzzer. The time constanst of this circuit is determined by R1 and C1. The buzzer will sound when C1 charges up to a desired level, it will cause the Q1 to conduct and triggers SCR1. The use of FET for Q1 make the RC constant can be very high for very long time dela

Long Period SCR Timer
Click here to download the full size of the above Circuit.

y, make this circuit has very wide range time setting. Here is the schematic diagram of the circuit:

Leave Comment

characters left:

New Circuits



Popular Circuits

Audio Tone Control
5-12V 200mA Regulated Power supply
12V / 4A Solar cell regulator
Motorised Infrared volume remote control
Stabilizing a laser discharge current
Lm318 Microphone preamplifier with tone control circuit and explanation
Circuits Schematic Mono Audio Mixer
RF circuits
A small FM transmitter (SMD)s
AC measuring circuit diagram
Arms single-phase rectifier bridge rectifier circuit
Differential amplifier circuit four connection methods and compare the characteristics of a
Differential circuit with constant current
Human to Robotic Voice changer circuit