This 1975 tachometer for cars with platinum can serve as an idea for new projects. The components are from the era and a modern equivalent operational amplifier can be used.
This high voltage source circuit was found in an old American publication. It uses a voltage...
This different power control circuit with SCR was obtained from a 1967 magazine. The SCR can be...
This isolated shield for triac was found in old European documentation. The resistor R1, in fact,...