This amplifier, whose mounting on a printed circuit board was described in Radio Electronics of October 1960, has 35 W of power. The power supply uses a transformer and a set of 5 tubes.
In the figure we have a circuit that allows to increase the maximum current from a 78xx to more...
This audio millivoltmeter was found in a 1992 publication. It can still be assembled, as the...
This circuit is indicated to determine the flight time of an electric motor model airplane. The...