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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Operational RIAA Preamplifier (CB14846E)
Common operational amplifiers like the TL series, CA3140 and others can be used in this circuit...
76 dB Gain Preamplifier (CB25695E)
This high-gain amplifier was found in the March 1994 issue of Electronics Now magazine. The...
Process timer (CB21865E)
We found this timer for times of a few minutes in a 1974 Ferranti transistor manual. The relay is 37...