Universal power control (CB8709E)

This circuit was found in a 90s Popular Electronics. The circuit uses several relays in order to obtain different controls for power loads.

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Electrometer (CB13653E)
This circuit requires an input current of only 20 fA (femto amps) which corresponds to a...
LM359 High-Gain General-Purpose Amplifier (CB14372E)
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500 kHz inverter (CB8470E)
Indicated for 12 V systems, this circuit was obtained in a 90s Siliconix documentation. The...