This circuit provides both frequency and voltage division. The circuit was found in a 1966 documentation. The circuit must be supplied with voltages from 32 to 40 V.
This simple electroscope with bipolar transistors is not the most sensitive, but can detect static...
This oscillator for various frequencies was obtained from a 1980s telecom documentation. The...
This circuit is from a July 1970 Radio Electronics magazine. The sensors are metal probes. The 18 V...