Transistorized multimeter (CB7355E)

This circuit is from a 1967 Triplett manual. The circuit uses components of the time, the common FET and the general-purpose bipolar transistor.

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Thermostat (CB19390E)
This SCR thermostat circuit was obtained in a technical documentation from the 1980s. Some...
Light Activated Switch (CB12193E)
This circuit is from an English publication from 1981. It can still be assembled with transistors BC548...
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