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 astable multivibrator using two transistor controls two small 50 mA lamps. The lamps can be...
This circuit has a type of bias called "virtual earth" providing good gain, given by R2. The...
This circuit can work with almost any JFET. The circuit is from an Electronics Now from April...