This circuit was found in the December 1992 issue of Radio Electronics magazine. The current is a few mA and the maximum input voltage is around 12 V.
This circuit was suggested by Philips in 1967 documentation. The circuit receives modulated light and has...
The BFO or Beat Frequency Oscillator is used to receive telegraphic signals or even modulated in...
This circuit uses uncommon Texas Instruments components today. The circuit is from an American...