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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Simple Voltage-Controlled Oscillator (VCO) Using the 4046 (CB110)
An application for the previous circuit (CB109) is shown here. The central frequency is determined by C and...
Simple long wave converter (CB5931E)
This converter converts a signal in the 200 kHz to 3.8 MHz band into frequency signals that can be...
ADS124S0x Low Power Analog to Digital Converters (COM173E)
January 2017 - The new Texas Instruments ADS124S0x Analog-to-Digital Converters or ADCs can now be...