9V power source (CB21164E)

This simple circuit with a 5V regulator was found in an American documentation from the 90's. The output voltage is adjusted in a trimpot.

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Rain alarm (CB20776E)
This simple rain, leak or moisture detector circuit appears in other places on this site with...
LCD power supply (CB8713E)
This circuit was obtained in a 90s EDN. The components used are from that time. The voltage...
Damped filter for triac (CB6742E)
This circuit is from a 1967 General Electric SCR manual. The capacitors are polyester and the...