Found in a 1969 Ferranti documentation, this circuit uses only bipolar transistors from that time. Transistors can be replaced with modern equivalents.
This circuit was found in a 1999 British magazine (ETI). It is a device that receives the signal...
This power stage with two transistors was found in Radio Electronics magazine from October 1963....
This circuit was obtained from an American publication from the 60's. The transistors are...