The transistor used in this circuit is uncommon today. AC124 or equivalent such as AC188K and 2N2431 can be used. The circuit is from the 80's and makes use of transformers.
This circuit for professional telegraph handlers automatically produces points and dashes. The...
This basic oscillator with tunnel diode generates a 100 kHz signal with 1 uW output power. The...
September 2017 - Analog Devices is making available through Mouser Electronics the Analog Devices...