This circuit was found in a Radio Electronics from February 1966. The circuit operates with a common battery and the frequency is given by the resonant LC circuit.
We found this circuit in an English publication from the 1980s. The circuit uses current...
This circuit uses common transistors for a fault indicator that turns on an LED and provides an...
This high current switching stage was found in a 1967 EEE. The power transistor is from that time....