C carlson New Member Jun 13, 2009 #1 How do I use this photo interrupter circuit Silicon Chip Online - Circuit Notebook at 3 volt (without relay) to pull pins 12/13 (in12/22) of this IC BA6845FS Datasheet pdf - Magnetic Disk LSIs > FDD stepping motor driver - ROHM low when beam blocked and high when beam not blocked.
How do I use this photo interrupter circuit Silicon Chip Online - Circuit Notebook at 3 volt (without relay) to pull pins 12/13 (in12/22) of this IC BA6845FS Datasheet pdf - Magnetic Disk LSIs > FDD stepping motor driver - ROHM low when beam blocked and high when beam not blocked.
MikeMl Well-Known Member Most Helpful Member Jun 13, 2009 #2 I'd wire it as in the train detector, but put a second inverter after the first. That would give you the high. If you can move the load resistor to the collector of the photo-transistor, then you can do it with only one Schmitt inverter.
I'd wire it as in the train detector, but put a second inverter after the first. That would give you the high. If you can move the load resistor to the collector of the photo-transistor, then you can do it with only one Schmitt inverter.
MikeMl Well-Known Member Most Helpful Member Jun 13, 2009 #4 Probably not, because the transition from on/off off/on will be not be a clean logic transition, will be too slow, and because of the low-gain optointerupter, will float around near the trip-point being modulated by 120Hz incident light.
Probably not, because the transition from on/off off/on will be not be a clean logic transition, will be too slow, and because of the low-gain optointerupter, will float around near the trip-point being modulated by 120Hz incident light.