This is the receiver for the previous circuit we found in the December 1992 Radio Electronics magazine. The sensor is a photodiode that must have optical features such as lenses.
Linear Technology's LT213 circuit, which suggests this application in 90s documentation, is not...
This circuit is more elaborate than the previous one, employing an integrated amplifier circuit of the...
This circuit was found in a PE Hobbyst Handbook from 1992. The second oscillator is a VFO. The...