Based on the LF256 operational amplifier, this circuit was found in the September 1989 issue of Radio Electronics magazine. The indicator is analog, and the power supply must be symmetrical.
This low power circuit can be powered with voltages from 1.8 V. We find it in a 80s Hands On...
This static switch or triac contactor was obtained from Philips 1969 documentation. The SCR is...
This circuit can be used to set the compass for walks or exercises, being small enough to be...