Line frequency square-wave generator

Posted on Nov 25, 2012

With only three components and a buffer, a line frequency square wave having a 1:1 duty cycle may be derived from the power supply. During the alternate half-cycle, however, A is effectively clamped to - 0.7 V by Dl in the bridge which offsets the forward voltage across D2 giving an input to IC1 of approximately 0 V.

Line frequency square-wave generator
Click here to download the full size of the above Circuit.

When A rises above + 5 V, D2 is reverse biased and remains at +5 V. Rl is needed to load the transformer secondary maintaining a distortion-free waveform at A during the time the diode bridge is not conducting. Cl although not essential may be required to remove transients.

Leave Comment

characters left:

New Circuits



Popular Circuits

Mini Amplifier Using Lm1895N Circuit
lie detector circuit diagram
how to use in-built adc of avr
low frequency sinewave
Generating a Delayed Pulse Using The 555 Timer circuit
1984 F-350: crew cab My fuel gage switch in the dash
Pills Reminder
555 tri-color flash circuit diagram ornaments