Receiver for FM Infrared Audio Link (CB20978E)

This circuit was found in a Popular Electronics from the 90s. The components admit equivalents and the phototransistor can be of any type.

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Transistors Tester (CB14943E)
We found this circuit in a 1979 Poptronics. The circuit can be easily assembled with the use of...
555 Voltage Quadrupler (CB25545E)
This circuit was found in the December 1992 issue of Radio Electronics magazine. The current is a...
Full Wave SCR Control (CB5278E)
In the figure we have a bridged circuit for the use of an SCR in a full wave control. The diodes...