139
2.51 Iron-free push-pull amplifier
Circuit 114:
Iron-free push-pull amplifier
Setup information
Install the three transistors, the two diodes, the four resistors and the two electrolytic capacitors as shown
in
Fig. 2.114
Followed by the 14 jumper wires. 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 sensitiv-
ity 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,
2 x 1N4148 silicon diodes,
1 x 100
Ω
resistor,
1 x 1 k
Ω
resistor,
1 x 100 k
Ω
resistor,
1 x 220 k
Ω
resistor,
2 x 1 nF ceramic capaci-
tor, 2 x 10 μF electrolytic
capacitors, 1 x Piezo
element, 1 x breadboard,
1 x 9V battery with clip
connector
Fig. 2.114:
Iron-free push-pull
amplifier
Experiment
If you connect an mp3 player to the input, you will hear the playback loud and sound coming from the
Piezo element.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.114.
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...
