This receiver for the AM band with 6 transistors was manufactured in the 60's in Japan. The power is made with 9 V and the circuit is of the super heterodyne type with FI of 455 kHz.
In this circuit from a 1991 publication, we can use the 2N2646 unijunction transistor and the...
In the figure we have the way to use the transistors of an old-paired pair as a trigger circuit. The...
This static switch or electronic contactor was found in a 1968 Motorola publication. The triac...