Moderators: Dave Moll, Steve Anderson
gary wrote:Harry, this circuit change won't help with the wiggly sync bar - but it should make the motor run to speed more reliably - all other things working of course.
gary wrote:Harry, on your new cct, why is encoder pulses connected to pin 4 of the 555?
(I have only had a quick look - will check agin tomorrow).
Steve Anderson wrote:Harry, suggested positive feedback for the LM311 attached. This should give you about 0,5V of hysteresis which means the signal from the phototransistor needs to be greater than this. But if it isn't just increase the value of the 150k feedback resistor until things work.
It may also be advisable to put a 100n disc-ceramic cap right across the power pins on the underside of the board as close to the LM311's power pins as possible.
Added components are in blue...
Steve A.
gary wrote:Harry, this circuit change won't help with the wiggly sync bar - but it should make the motor run to speed more reliably - all other things working of course.
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