This step of two transistors has a high input impedance due to the use of FET. We can use BF245 for this function and the bipolar can be BC548. The circuit is from an 1975 American documentation.
No information was given on the inductor enrolled in the common core of this circuit two years 80. The...
This audio amplifier uses 3 transistor in a traditional configuration named complementary output....
The critical point in this project is the adjustment of the optical system, mainly to avoid...