Am Antenna Amplifier Diagram. Circuit and working fig. 1 shows the circuit of antenna preamplifier for am radios.

If a power supply is used bypass the power supply using a 0 04µf capacitor to prevent noise pickup. You dont have to make any wire connection with this antenna simply place your am radio near to it. Circuit of antenna preamplifierfor am radios.

I was recently given a tuner set up one of those boxes that you plug tv dvd speakers cd and vcr into and has a built in fm am tuners the tuner has ports in the back to plug in wires for fm antenna and am antenna.

The antenna used on this circuit is a standard 18 inch telescoping type but a thick piece of copper bus bar or piano wire will also work fine. It use 9vdc supply to work. This circuit use active component jfet vhf amplifier mpf102 to boost the radio signal. Using this antenna booster circuit for short wave reception an 8 antenna would produce a strong signal level equivalent to a 20 to 30 feet wire antenna.