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.
Indicated for applications with a PC, this circuit was found in an English documentation from...
If you have an old cassette player or bought one from a junk shop, you can set up a small table...
This power oscillator uses an LM380 amplifier. We found it in old English documentation. The C3...