Based on an integrated circuit of the time, this circuit appeared in the October 1979 issue of Radio Electronics magazine. The circuit monitors voltages in the range of 10.5 to 16.0 V.
This circuit was obtained from an English documentation based on a 74121 TTL integrated circuit....
This circuit generates signals with opposite phases determined by C1 and adjusted by R2. The...
The presented circuit uses two old germanium transistors. We found this configuration in a...