59
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.
Components required:
1 x 2N3904 transistor,
1 x 220
Ω
resistor,
1 x 56 k
Ω
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
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.
Summary of Contents for ELECTRONICS EXPERIMENTS BOX
Page 4: ......
Page 265: ...267 Fig 3 56 Cir cuit 56 Audio limiter Fig 3 57 Circuit 57 Amplifier for a storm detector...
Page 269: ...271 Fig 3 64 Circuit 64 Stabilizer for 1 9 V Fig 3 65 Circuit 65 Stabilizer for 2 5 V...
Page 275: ...277 Fig 3 80 Circuit 80 Quiztimer 30 seconds Fig 3 81 Circuit 81 Handy diode tester...
Page 315: ...317 Fig 3 179 Circuit 179 HF generator 150 kHz Fig 3 180 Circuit 180 HF generator 420 kHz...
