Found in a 90’s 73 magazine for radio amateurs, this circuit provides a few milliamps of output with -15 V from a 3 V input, when the consumption will be 10 mA.
We found this circuit in a 1983 English magazine, but it can be easily assembled today, as all...
This circuit was found in a 1967 documentation. The switch diode is a component of the time and is...
This circuit of very high input resistance was found in a Radio Shack documentation from 1977. The...