I'm sure it could be made to work just fine, but of course you'd have to do some coding and interface the CPU to the real world.. Not my forte, I'm afraid.Any thoughts on the CPU idea?
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I'm sure it could be made to work just fine, but of course you'd have to do some coding and interface the CPU to the real world.. Not my forte, I'm afraid.Any thoughts on the CPU idea?
Do you mean you're powering the whole circuit from 4.5V? If so, it's won't work as designed.using only 4.5 v throughout
You can check with a DMM, since the opto output is being kept low.I don't have an oscilloscope
If pin 2 stays low, pin 3 stays high. That's the way a 555 works .Surely if the Pin 2 is kept low, the output to HOLD should not stay active?
Probably not, if the LED is staying on.That means the fault must lie between C5 and R7 in your schematic
Your presumption is incorrect. If pin2 is kept low the timer output (pin 3) will stay high for as long as pin 2 is low, so will not be determined by the Trim 1 setting. That's why, as Chris has explained, you need to check C7 (and R11/12 as I mentioned in post # 92).I presume if input at 2 is low, the output to the FET gates would be transient determined by set pot 1.