Infrared indicator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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This device will help to check and repair devices, which work is based on the use of infrared (IR) region of the electromagnetic spectrum, - remote controls for household appliances, paper presence sensors in printers, copiers and facsimile machines. Being brought to the source of infrared rays not perceived by the human eye, it will give a signal about their presence.
The indicator scheme is shown in fig. one.
When irradiated with IR rays, the phototransistor BL1 sensitive to them opens. The current flowing through it in this case, after amplification by transistors VT1 -VT3, is enough to ignite the HL1 LED. The glow of the latter will testify to the operability of the tested source of IR radiation. If you point a working TV remote control at the indicator and press any command button, the HL1 LED will flash at the frequency of the emitted pulses. The IR radiation of the paper presence sensors is continuous, so the LED will be lit without blinking.
The voltage of 5 V to power the indicator can be obtained from the mains adapter. The current consumption is very small. If you want to make the device autonomous, you can power it from a battery of two to four galvanic cells or batteries, remembering to provide a switch. With the supply voltage reduced to 3 V, it may be necessary to replace the resistor R4 with another one, rated 100 ohms.
The drawing of the printed circuit board of the indicator is shown in fig. 2. It is placed in a case - packaging from Tick-Tak dragees. The packaging is transparent, so there is no need to drill holes in it for the LED and phototransistor.
An IR-sensitive phototransistor is carefully soldered out of a faulty computer mouse. Before installing it in the indicator, it is checked with an ohmmeter and, if necessary, the pin assignment is determined. With the correct polarity of connection to the device, the resistance of the collector-emitter section of a working phototransistor in the dark should be very large (more than 1 MΩ), and when illuminated with an ordinary incandescent lamp, it should decrease many times.
KT315B transistors can be replaced with any of the KT315, KT3102 series, and the AL307B LED can be replaced with another domestic or imported one of a suitable size and glow color.
The required sensitivity of the indicator is achieved by selecting the resistor R1. Do not set it too high - the device will react to normal daylight or electric light. A clear fixation of IR radiation at a distance of several centimeters from its source is sufficient.
Author: A. Molchanov, Rivne, Ukraine
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