We found this circuit in the July 1988 Radio Electronics magazine. The frequencies are given by capacitor C1 and the voltage input is made at pin 1.
This interesting circuit allows to obtain symmetrical voltages from a simple battery. Among its...
We found this circuit in an English magazine from 1980. The circuit can be easily assembled even...
This optical tachometer with LASCR was found in a 1965 General Electric documentation. The diode at...