This circuit was found in an American documentation from 1969. Indications of the used transistors are not given, but general-purpose types can be tested.
In this circuit of 1987 the player has to briefly press one of the keys trying to hit which LED...
This circuit converts the 12 to 13.6 V of a battery into 6 Vwith current up to 1 A. We can use it...
We found this conventional version of a single-transistor oscillator in the January 1996 issue of...