This Mullard circuit was found in a 1969 documentation. It uses complementary transistors on the output and does not need a transformer. The bandwidth goes from 100 to 20 000 Hz.
The original purpose of this circuit, which we find in old American documentation, is to modulate an...
This circuit is from an American publication of 1978. It can be assembled with modern transistors, since...
This circuit detects changes in magnetic flux in a coil as an external magnetic field moves. The...