231
Circuit 206:
Discrete Operational amplifier with Piezo element
Setup information
Install the three transistors, the four resistors and the two electrolytic capacitors as shown in
Fig. 2.206
The
fifteen jumper wires come next. Last but not least connect the Piezo element. Check the placement on the
board again and only then connect the battery.
You can significantly increase the sensitivity of the Piezo element by using a sound plate or even a sound
box. Read more about it in Chap. 1.2.3
Components required:
2 x 2N3904 transistors,
1 x 2N3906 transistor,
1 x 22
Ω
resistor, 1 x 1 k
Ω
resistor, 1 x 2.2 k
Ω
resistor,
1 x 10 k
Ω
resistor,
2 x 10 μF electrolytic
capacitors, 1 x Piezo ele-
ment, 1 x breadboard,
1 x 9V battery with clip
connector
Fig. 2.206:
Discrete Operational
amplifier with Piezo element
Experiment
If everything is wired correctly, you will have a simple audio amplifier with an operational amplifier. If you
connect an mp3 player to the input, you will hear the amplified sound of music coming from the Piezo ele-
ment.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.206.
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...
