Found in a 1988s Radio Electronics, this circuit uses transistors of general use to increase the intensity of signals up to about 30 MHz. The power can be done by battery because the consumption is low.
This transformerless 16-ohm speaker circuit was found in a Radio Electronics from October 1963. The...
In the figure we have a solar power source for experiments with this type of energy. The cells must...
This circuit was found in a 1986 documentation and it may be difficult to obtain some of its...