Wireless Infrared Handset (CB20980E)

This circuit is from a Popular Electronics from the 90's. The audio amplifier admits equivalent. The others integrated are not very common today.

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Laser Power Supply (CB24192E)
This is one of the first solid state laser projects. It was found in the June 1972 issue of Radio...
Speed Control LM13080 (CB4859E)
The integrated circuit used in this project is not common today. It was found in a 2000...
10 Hz to 10 kHz VCO (CB8746E)
This 3-decade operating range VCO was found in a 90s Popular Electronics. The circuit uses...