219
Circuit 194:
Simple IR receiver
Setup information
Install the transistor, the resistor and the electrolytic capacitor as shown in
Fig. 2.194
followed by the
jumper wire. Finally 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 PT331C phototransis-
tor, 1 x 10 k
Ω
resistor,
1 x 10 μF electrolytic
capacitor, 1 x Piezo ele-
ment, 1 x breadboard,
1 x 9V battery with clip
connector
Fig. 2.194:
Simple IR receiver
Experiment
You can connect an mp3 player or the speaker output of a portable radio to the input. IR diode and pho-
totransistor must face each other head-on at a distance of up to a few centimetres. You will hear music
coming from the Piezo element. If you hold a small piece of metal sheet or cardboard between the IR diode
and the phototransistor, transmission stops immediately.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.194.
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...
