196
Circuit 171:
Buffer amplifier for condenser microphone
Setup information
Install the transistor, the two resistors and the two ceramic capacitors as shown in
Fig. 2.171
. 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 2.2 k
Ω
resistor,
1 x 1 M
Ω
resistor,
1 x 1 μF electrolytic
capacitor, 1 x 10 μF
electrolytic capacitor,
1 x breadboard, 1 x 9V
battery with clip con-
nector
Fig. 2.171:
Buffer amplifier for
condenser microphone
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 condenser microphone or an
electret microphone on a normal amplifier port.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.171.
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...
