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 configuration enables the use of low current switches or sensors to control high power loads...
We found this circuit in an old amateur radio manual. The circuit makes use of PIN diodes to...
The purpose of this circuit is to invert the phase of a noise and apply it to the environment in...