Push-Pull Amplifier - Maker Factory ELECTRONICS EXPERIMENTS BOX Manual

2.94 Push-Pull amplifier

Circuit 200: Iron-free push-pull amplifier
Setup information
Install the three transistors, the two diodes, the three resistors and the two electrolytic capacitors as shown
in Fig. 2.200 followed by the ten 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 sensitivity of the Piezo element by using a sound plate or even a sound
box. Read more about it in Chap. 1.2.3
Experiment
Push-pull amplifiers are basic circuits in analogue amplifier technology. Connect an mp3 player to the input
and you will hear the playback loud and sound over the Piezo element.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.200.
Components required:
2 x 2N3904 transistors,
1 x 2N3906 transis-
tor, 2 x 1N4148 silicon
diodes, 1 x 100 Ω resis-
tor, 1 x 220 Ω resistor,
1 x 100 kΩ resistor,
2 x 10 μF electrolytic
capacitors, 1 x Piezo ele-
ment, 1 x breadboard,
1 x 9V battery with clip
connector
Fig. 2.200: Iron-free push-
pull amplifier
225