Tone detector


Posted on Apr 1, 2012

The detector circuit is made up a two-amplifier multiple feedback bandpass filter followed by an ac-to-dc detector section and a Schmitt Trigger. The bandpass filter (with a Q of greater than 100) passes only 5Q0 Hz inputs whch are in turn rectified by Dl and filtered by R9 and Ca


Tone detector
Click here to download the full size of the above Circuit.

This filtering action in combination with the trigger level of 5 V for the Schmitt device insures that at least 55 cycles of 500 Hz input must be present before the output will react to a tone input.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Sealed Lead-Acid Charger
Digital Radar Speedometer Circuit
Light Signals
amplifier timer
10.58 to 10.74 mhz vfo oscillator circuit
Thyristor Tester
Simple TV Transmitter Circuit
USAT F3A Tips



Top