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 is suitable for modulating AM transmitters. The circuit is from a 1977 radio amateur...
This double tone generator uses a specific integrated circuit, having been found in a 1977 CMOS...
This is a simple 1-digit voltmeter circuit using voltage comparators. It was found in a 2004...