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2.13 Antenna amplifier
Circuit 34: LM antenna amplifier for antennas with longer wires
Setup information
Install the transistor and the two resistors as shown in Fig. 2.34. Then install the two ceramic capacitors.
The three jumper wires come next. Check the placement on the board again and only then connect the bat-
tery. Connect the circuit input to the long-wire antenna. The output is connected to the antenna input of an
LW-MW radio receiver but only if you are familiar with the relevant safety guidelines as per VDE and know
how to observe them when working with devices that are to be connected to the mains.
Experiment
If everything is wired correctly, the circuit will amplify the low receiving voltage of the wire antenna within
LW and MW ranges. You should be able to receive several remote stations during the day in addition to the
local station on medium wave. Despite or better due to the complex IP radio and DAB+ systems, the uncom-
plicated and genuinely mobile MW reception seems to be experiencing some sort of comeback.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.34.
Components required:
1 x 2N3904 transistor,
1 x 220 Ω resistor,
1 x 56 kΩ resistor,
2 x 100 nF ceramic capaci-
tor, 1 x breadboard, 1 x 9V
battery with clip connector
Fig. 2.34: LM antenna amplifier
for antennas with longer wires
59
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