Dear All
I have a packing machine which uses a photo-sensor to detect a black mark on the packing paper to drive a motor for advancing the paper roll. The relay driver board for this sensor stopped working and I am unable to make it to work. So I traced out its layout and through a little effort was able to reconstruct its circuit diagram. The board uses a simple 555 timer to process the input signal from the photosensor and drive a relay which in turn drives a contactor which drives the advancing motor. Looking at the circuit, it appears to be a complicated version of a monostable one-shot (the process is repetitive; everytime the sensor detects the black spot, it runs the motor to advance the packing paper).
Can someone please look at the circuit and let me know how the 555 is functioning for my better understanding.
Thanks
I have a packing machine which uses a photo-sensor to detect a black mark on the packing paper to drive a motor for advancing the paper roll. The relay driver board for this sensor stopped working and I am unable to make it to work. So I traced out its layout and through a little effort was able to reconstruct its circuit diagram. The board uses a simple 555 timer to process the input signal from the photosensor and drive a relay which in turn drives a contactor which drives the advancing motor. Looking at the circuit, it appears to be a complicated version of a monostable one-shot (the process is repetitive; everytime the sensor detects the black spot, it runs the motor to advance the packing paper).
Can someone please look at the circuit and let me know how the 555 is functioning for my better understanding.
Thanks
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