224
Circuit 199:
Infrared receiver
Setup information
Install the transistor, the diode and the resistor as shown in
Fig. 2.199
followed by the four jumper wires.
Check the placement on the board again and only then connect the battery.
Components required:
1 x PT331C phototransis-
tor, 1 x red LED, 1 x 1 k
Ω
resistor, 1 x breadboard,
1 x 9V battery with clip
connector
Fig. 2.199:
Infrared receiver
Experiment
The best way is to build the IR transmitter of our previous circuit together with this one on a shared bread-
board. This allows you to align the IR diode and the phototransistor facing each other so that the infrared
light travels directly into the phototransistor. If everything is wired correctly, the IR diode emits a strong
light within the infrared range. The phototransistor responds and the red LED turns on. A cardboard piece
held between IR diode and phototransistor blocks the beam of light, and the red LED turns off. If the LED
is replaced by a suitable relay, you could use it to remotely turn on and off a self-built tube amplifier, for
example.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.199.
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...
