This circuit was found in a 1968s American. Transistors are of general purpose and the input is a rectangular signal of appropriate amplitude.
This variable oscillator with power step for alarms was found in an American documentation from...
Found in a 90s Popular Electronics, this circuit is interspersed between the filter and the...
This circuit was found in a 1968 General Electric manual. The circuit is for 3 A motors but can be...