Circuit Project Electronic www.eleccircuit.com |
| The Infrared receiver circuits using LM1458+CD40103 Posted: 12 Jan 2013 11:04 PM PST From Infrared Remote control transmitter by IC-555-BD137. Let’s build the Infrared receiver circuits. Which has too much circuits. Starting from a simple circuits as Figure 1 first. We will see that a photodiode is connected in the reverse bias form. So, while infrared light to hit it. It has very little current through it. But when has the infrared light from the light will cause the current to flow through the diode is good. Cause a voltage signal to the frequency of the signal transmitter set to transistor TR1(BC549). Which is connected with TR2(BC557) are a amplier circuit about 1000 times. Both capacitors C2,C3 are the high pass filter circuit. Two diode D2(1N4148),D3(1N4148) act as the convert AC voltage signal to DCV. By has C5 is filter current to smooth. The voltage output drive transistor TR3 to the relay works. The relay so work when has the infrared light from [...] |
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