Tube negative ion generator (CB21002E)

This circuit was found in an old American magazine for radio amateurs. The circuit is based on a very high voltage tube of the time.

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Universal Motor Control (CB24059E)
This triac circuit was taken from an article in the July 1970 Radio Electronics magazine. Note the...
Gain Relay Excitation Circuit (741) (CB11882E)
Signals ranging from a few millivolts to a few volts can be used to excite a relay with this...
Low Power C to DC Converter (CB20668E)
This circuit was found in American documentation from the 90's. The transformer determines the...