In use telephone indicator (CB8657E)

Found in a 90s Popular Electronics, this circuit keeps an LED on when a phone is in use. Can be used with extensions.

Robotic Arm (CB18088E)
The idea of this automation can be extended to other applications that involve the control of...
Wireless Guitar (CB25579E)
This sophisticated transmitter was found in the June 1993 issue of Electronics Now magazine. The...
LM5166 Synchronized Buck Converter
March 2017 - Texas Instruments LM5166 Synchronized Buck Converters are available at Mouser for 3V...