We found this circuit in an American documentation from the 90's. The circuit makes use of general purpose NPN transistors. The 0.005 uF (5nF) capacitors determine the frequency.
The circuit presented is from a 1972 RCA technical documentation. The integrated circuit consists of a...
This circuit is from a 1967 publication. The configuration holds true for modern transistors having...
This proximity relay circuit was found in the July 1990 Radio Electronics magazine. The supply...