This direct-coupled amplifier was found in Mullard's 1960s transistor manual. The transistors are germanium from the time.
This simple circuit connects in external battery to a load when the AC Power line fails. S1 can be...
We present a circuit for those who want to give the impression that there are people at home when...
This circuit was obtained in an old documentation, receiving the medium wave range. L1 has 20 + 60...