We found this circuit in an English publication from the 60's. The transistors are of germanium of the time and the headphones must be high impedance magnetic.
This high input impedance circuit was found in American documentation from the 1980s. The power...
This didactic circuit makes the sequential activation from 0 to 10 to demonstrate the functioning of a...
Originally recommended to give a tone of transmission in equipment of the 60s (tubed) this circuit is...