This 1965 circuit consists of a small inverter for an ultraviolet lamp. The circuit is from a Motorola manual and the transformer must be wound on the core indicated in the diagram.
I found this circuit in an old English magazine from 1979, but it can be easily assembled with...
Using comparators, this circuit can be used in a measurement bridge. The balance indication is...
This circuit uses old germanium transistors because it was found in an old magazine from 1973....