Visual zero-beat indicator

Posted on Oct 20, 2012

Light-emitting diodes connected with reverse polarity provide a visual indication of zero-beat frequency. Each LED is on for only half a cycle of the input. When the input frequency is more than 1 kilohertz away from the zero-beat frequency, both LEDs appear to be on all the time. As the input frequency comes within about 20 hertz of zero beat, the LEDs will flicker until zero beat is reached

Visual zero-beat indicator
Click here to download the full size of the above Circuit.

Both LEDs glow or flicker until zero beat is reached, when they go out.

Leave Comment

characters left:

New Circuits



Popular Circuits

Hi-Fi Tone Control
motorola hi fi power
Thyristor Fired Coilgun
4013 D-type flip-flops
2002 Chevy Cavalier heater/AC temp control wont light up at nite
Motorola MaxTrac Radius and GM300 Series Introductory Information
Cordless telephone voice processing circuit diagram