187
Circuit 162:
Needle pulse generator 4 kHz
Setup information
Install the two transistors, the two resistors and the ceramic capacitor as shown in Fig. 2.162. The nine
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:
1 x 2N3904 transistor,
1 x 2N3906 transis-
tor, 1 x 10 k
Ω
resistor,
1 x 100 k
Ω
resistor,
1 x 10 nF ceramic
capacitor, 1 x Piezo ele-
ment, 1 x breadboard,
1 x 9V battery with clip
connector
Fig. 2.162:
Needle pulse
generator 4 kHz
Experiment
If everything is wired correctly, you will hear a rhythmic clicking sound coming from the Piezo element. The
refresh rate is approximately 4 kHz.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.162.
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...
