This Power supply sources from 500 to 1,000 mA according the transformar and was found in a publication of the year 1958. The diodes can be now the 1N4004 and the transistor should be mounted on a heatsink.
This circuit produces a sine 1 kHz signal. The frequency is given by C1, C2 and C3. This is a...
This tone-modulated transmitter produces a tone with frequency depending on C4 and C5. Free...
We found this circuit in an American 1980s documentation. The circuit can be easily assembled in our...