RF or even switching transistors like the 2N2222 can be used in this circuit. The capacitors are ceramic and the frequency is determined by the crystal.
This didactic circuit makes the sequential activation from 0 to 10 to demonstrate the functioning of a...
This power source was found in an old Argentine publication from 1973. The transistor could be the...
This circuit operates at a voltage of 1.3 V from a single mercury cell. We found in an old...