It is a 13.8 V x 10 A regulator obtained in a 2008 documentation. The 2N3055 transistors must be mounted in excellent heat sinks and the voltage is adjusted in the trimpot.
Found in an American publication from 1968, this circuit generates pulses at a rate of 2,500 per...
The transistors on this circuit can be the BC548. The circuit is from English documentation from...
In the figure we have a stereo decoder from the 70's with pilot lamp for signal indication. The...