60
Circuit 35:
LM antenna amplifier for antennas with short wires
Setup information
Install the two transistors and the four resistors as shown in
Fig. 2.35.
Then install the three ceramic capaci-
tors. The six jumper wires come next. Check the placement on the board again and only then connect the
battery. Connect the circuit input to a short-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 on working with
devices that are to be connected to the mains as per VDE and know how to observe them
Components required:
1 x 2N3904 transistor,
1 x J111 FET transistor,
1 x 1 M
Ω
resistor,
1 x 56 k
Ω
resistor,
1 x 6.8 k
Ω
resistor,
1 x 470
Ω
resistor,
2 x 100 nF ceramic capaci-
tors, 1 x 10 nF ceramic
capacitor, 1 x breadboard,
1 x 9V battery with clip
connector
Fig. 2.35:
LM antenna amplifier
for antennas with short wires
Experiment
If everything is wired correctly, the circuit will amplify the low receiving voltage of the wire antenna in 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. 3.35.
Содержание ELECTRONICS EXPERIMENTS BOX
Страница 4: ......
Страница 251: ...253 Fig 3 27 Circuit 27 4 seconds switch off delay Fig 3 28 Circuit 28 20 seconds switch off delay...
Страница 258: ...260 Fig 3 42 Circuit 42 Active 8 5V battery monitor Fig 3 43 Circuit 43 Active 7 8V battery monitor...
Страница 260: ...262 Fig 3 46 Circuit 46 Meters for 1 5 V Zener diodes and higher Fig 3 47 Circuit 47 Discreet 2 2V Zener diode...
Страница 261: ...263 Fig 3 48 Circuit 48 Discreet 2 9V Zener diode Fig 3 49 Circuit 49 Discreet 3 7V Zener diode...
Страница 265: ...267 Fig 3 56 Cir cuit 56 Audio limiter Fig 3 57 Circuit 57 Amplifier for a storm detector...
Страница 269: ...271 Fig 3 64 Circuit 64 Stabilizer for 1 9 V Fig 3 65 Circuit 65 Stabilizer for 2 5 V...
Страница 275: ...277 Fig 3 80 Circuit 80 Quiztimer 30 seconds Fig 3 81 Circuit 81 Handy diode tester...
Страница 290: ...292 Fig 3 118 Circuit 118 HF watch dog with LED indicator Fig 3 119 Circuit 119 HF watchdog with moving coil instrument...
Страница 295: ...297 Fig 3 130 Circuit 130 4 seconds switch on delay Fig 3 131 Circuit 131 15 seconds switch off delay...
Страница 298: ...300 Fig 3 136 Circuit 136 NAND gate with moving coil instrument Fig 3 137 Circuit 137 Input level Mixing console...
Страница 300: ...302 Fig 3 140 Circuit 140 Electrometer with moving coil instrument Fig 3 141 Circuit 141 Simple AM Radio...
Страница 315: ...317 Fig 3 179 Circuit 179 HF generator 150 kHz Fig 3 180 Circuit 180 HF generator 420 kHz...
Страница 324: ...326 Fig 3 202 Circuit 202 3 seconds switch on delay Fig 3 203 Circuit 203 7 seconds switch on delay...
Страница 325: ...327 Fig 3 204 Circuit 204 Piercing siren sound with Piezo element Fig 3 205 Circuit 205 Discrete Operational ampli fier...
Страница 328: ...330 Fig 3 210 Circuit 210 Discreet 5 2V Zener diode Fig 3 211 Circuit 211 Discreet 7 4V Zener diode...
