Automatic shut-off circuit
This alarm circuit is very simple, if triggered once, will keep on sounding until either the battery is drained off or the power is cut-off. … Read more
Digital Circuits
Audio metronome circuit with led indicator
The metronome circuit of circuit below produces audible ticks from 40 ticks per minute to 400 ticks per minute by variation of one potentiometer. Gates … Read more
1 MHz Crystal Oscillator based CMOS 4011
Many electronic circuits requiring precision control of time use crystal oscillators. A simple crystal oscillator using only one NAND gate based CMOS 4011 shown in … Read more
Simple Pulse Generator Circuit
The output waveform of oscillator circuits shown in picture circuit below is square wave because capacitor C charges and discharges through the same resistor R. … Read more
Astabil Multivibrator circuit using CMOS
The astable multivibrator shown in above picture operates in a manner very similar to a free-running multivibrator using two cross-coupled NPN transistors. Two NAND gates … Read more
Digital logic touch switch circuit
Many circuits for TAPs (Touch Activated Pro-gramme switches) have previously been pub-lished. However, all of these required the use of two pairs of touch contacts, … Read more
Digital Volume Control Circuit
Many of today’s hi-fi amplifiers feature a “clicking” digital volume control circuit, but this is only rarely a real stepped attenuator based on a wafer … Read more