Beat-Frequency Audio Generator

Posted on Oct 21, 2012

Ql is a fixed oscillator operating at 455 kHz. Ul is a mixer, with its own internal oscillator running at 45

Beat-Frequency Audio Generator
Click here to download the full size of the above Circuit.

5 kHz. FIL1 and FIL2 are Murata CSB455E filters or equivalent. Dl is a varactor diode (an IN4002 used as a varactor works well here). R6 controls the bias on Dl. When R6 is varied, the oscillator frequency varies a few kHz. Audio beat note is taken, through RF filter L2 and CIO, from pin 5 of Ul.

Leave Comment

characters left:

New Circuits



Popular Circuits

Car battery tester with LM3914
Full-Cup Detector For The Blind
Infrared Transmitter-Receiver with 555
Scientific Society
Electronic Transformers Modulation
Wideband DTV UHF Antenna TV Amplifier Circuit using transistor 2sc3358
circuit to test servo motor (pole rotor) of parabolic antenna
Birds singing analog signal generator circuit