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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RF detector (CB17363E)
This circuit allows the detection of RF signals using the lowest range of direct currents of a...
Frequency DoublerB 150 to 300 MHz (CB19930E)
The MC496 integrated circuit used in this application is not common today. Motorola's circuit...
Voltage level circuit (CB7909E)
This window comparator circuit was found in a Popular Electronics from the 90s. The circuit has a...