2 module ir light barrier wont run same power source


Posted on Feb 7, 2014

Connected 0. 1uf cap and 500uf electrolytic cap to transmitter and the same to receiver. The result was it still does not work. I tried to add just diodes but it did not help either. when u say it doesent work-what is happening when the ir is recieved by the rx unit-what happens when no ir is recieved a scope would be handy here to see exactly what is happening when the two units are powered


2 module ir light barrier wont run same power source
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up but add decoupling caps across the supply for both units -what type of supply are u using to power them it may be that which is causing the problem. when u say it doesent work-what is happening when the ir is recieved by the rx unit-what happens when no ir is recieved a scope would be handy here to see exactly what is happening when the two units are powered up but add decoupling caps across the supply for both units -what type of supply are u using to power them it may be that which is causing the problem. I`m using this PSU, in dual mode meaning the other PSU was conected to transformer with no load. I did blow my fuse 250mA at the transformer for some reason. I wonder if the fuse rating is correct and if LM338 needs a dummy load, remember I have dual PSU The receiver is just looking for any variation in light levels, and it will also operate when there is noise on the power supply. That will make it fail to detect a break in the beam. Power supply noise could come from the power supply or from the transmitter. Either way, you should isolate the receiver from that noise with something like a 10 © resistor in series, close to the receiver. That, along with the 1000 µF capacitor in the receiver (C5, shown near the buzzer) should remove noise at the frequencies that the receiver is sensitive to. The receiver is just looking for any variation in light levels, and it will also operate when there is noise on the power...




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