We found this circuit in a Popular Electronics of the 90s. The circuit can be easily mounted today, as the components are common. The SCR can be the TIC106.
This circuits shows how to use in operational amplifier as a basic voltmeter. Power supply must be...
The coils determine the frequency of this oscillator that we found in the January 1996 issue of...
This circuit was found in a National Semiconductor Handbook from the 1990s. The integrated circuit...