195
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.
Components required:
1 x J111 FET transistor,
1 x 1 k
Ω
resistor,
1 x 220 k
Ω
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
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.
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...
