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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S meter (CB4213E)
This S-meter or signal strength meter, was originally designed for the 80's Regency receiver, but can...
DC Motor Speed Control 555 (CB17246E)
Motors of up to 3 or 4 A can be controlled with this PWM circuit. The circuit can be used with 5 to...
Fast Phototransistor (CB14646E)
With the use of a cascade transistor, the dynamic response of a phototransistor can be increased, as...