This servo circuit was found in 1969 Motorola documentation. Integrated circuits and transistors are types of the time, hard to find today.
This circuit, from an old Argentine publication, provides 6 W of output from an output of less...
This stabilized power supply was found in the 1974 Ferranti transistor manual. The power...
This small experimental amplifier was found in a 1979 documentation. ParaQ1 we can use a BC548 and...