Transistor Test (CB22542E)

This circuit is from a commercial transistor test model found in the March 1958 Radio Electronics magazine. The circuit uses an analog indicator.

Varicap Frequency Doubler (CB13349E)
This circuit doubles the frequency of a signal using a varicap. In this case, the input is 28 MHz,...
Broadband IR Receiver TDA3047 (CB15396E)
This receiver for infrared remote control was found in the Philips Databook of 1990, The circuit...
Up to 1000 W Power Control (CB16463E)
This traditional triac power control circuit can control loads up to 1000 W. The triac must be...