We found this circuit in an English publication from 1969. The circuit uses transistors from the time and can operate at frequencies up to 300 MHz. Observe the waveforms of the obtained signal.
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...