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.
Other operational amplifiers series, such as the MC34072, MC34074, MC35071, MC35072, MC35074 d...
This symmetrical power supply with a current of the order of 100 mA was found in an old...
This circuit for semiconductor laser excitation and modulation was found in an American...