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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Kelvin Thermometer (CB15929E)
This circuit suggested by Intersil, provides a Kelvin scale of 3 and a half digits in a 7106, with...
LED Drive for 100 MHz (CB4610E)
This circuit suggested by Motorola can be used as LED high frequency modulator. One possible...
Simple Diodes Test (CB14700E)
This LED diode test is suggested by the Texas Instruments optoelectronics manual. The transformer current...