Heating Control (CB21371E)

This circuit for powers up to 240 W was found in a 1967 RCA SCR manual. The SCR must be in accordance with the controlled load.

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Automatic Transmitter Switch (CB24533E)
This circuit was found in the December 1977 issue of Radio Electronics magazine. The circuit uses...
Tone control (CB12811E)
We obtained this circuit from an old Argentine magazine. The circuit originally uses germanium...
High Input Voltage Regulator (CB13050E)
The 78XX series voltage regulator integrated circuits do not support an input voltage greater than...