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.
Suggested by the General Electric Hobby Manual of 1965 this circuit measures voltages from 0 to...
) The circuit in the figure uses an old OC71 germanium transistor. Performance depends on...
We find this circuit in an American documentation from the 80's. The circuit has the coil given by the...