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2.79 Buffer amplifier
Circuit 170: Buffer amplifier for magnetic loop antenna
Setup information
Install the transistor, the two resistors and the two ceramic capacitors as shown in Fig. 2.170. The three
jumper wires come next. Check the placement on the board again and only then connect the battery.
Experiment
This circuit is a simple buffer amplifier. The input has high impedance, the output has low impedance.
A signal is not amplified and thus provides the ideal conditions to operate a magnetic loop antenna on a
normal antenna port of a radio receiver.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.170.
Components required:
1 x J111 FET transistor,
1 x 1 kΩ resistor,
1 x 220 kΩ resistor,
2 x 10 nF ceramic capac-
itors, 1 x breadboard,
1 x 9V battery with clip
connector
Fig. 2.170: Buffer amplifier for
magnetic loop antenna
195
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