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 was found in a 1975 documentation. The SCR can be of any type and in this case, we...
This fuzz circuit is more elaborate with the previous ones, as it has a selection switch that...
The XR2206 is not a common component today, but if you have one you can build this function...