138
2.50 Trill generator
Circuit 113:
Trill generator
Setup information
Install the transistor, the seven resistors and the three ceramic capacitors and the electrolytic capacitors
as shown in
Fig. 2.113
The twelve jumper wires come next and then the jumper, which will function as a
switch (shown dashed). For your guidance, we labelled the “switch” with “Start”. We don’t need the Piezo
element this time. Check the placement on the board again and only then connect the battery.
Components required:
1 x 2N3904 transistor,
1 x 220
Ω
resistor,
1 x 1 k
Ω
resistor,
2 x 10 k
Ω
resistors,
2 x 100 k
Ω
resistors,
3 x 10 nF ceramic capaci-
tors, 3 x 10 μF electrolytic
capacitors, 1 x Piezo
element, 1 x breadboard,
1 x 9V battery with clip
connector
Fig. 2.113:
Trill generator
Experiment
If everything is wired correctly, the “switch” is open, which means that one end of our jumper wire is not
connected. “Close” the jumper marked
START
for a moment. Only when the »switch« is open again, the
Piezo element emits a sound that slowly fades away.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.113.
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...
