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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Bipolar Digital Amplifier (CB25627E)
This high-gain digital amplifier uses general-purpose transistors. The supply voltage is logic...
Alternative RIAA Equalizer (CB25698E)
We found this circuit in the March 1993 issue of Electronis Now magazine. The circuit uses common...
Precision Light Activated Alarm (CB26240E)
Using an LDR as a sensor and an operational amplifier this circuit was found in the Encyclopedia of...