Re: Need help with intermittent circuit failures - JK Flip Flops


However, do I really need to add another IC to my board (the 2nd 555)?
This
board has to be as small as possible... I didn't think I'd need so much
electronics to do this simple task. Maybe 1x 556 (dual 555 IC) instead of
2x 555 would save a little more space??

---
The second 555 isn't necessary. After thinking about it for a
while, Petrus' suggestion to use unused gates to get the delay
turned out to be a good one, so that's what I did. I've posted a
new schematic for you on abse which has that change (as well as
others) on it. After looking the schematic over, if you need a
circuit description I'll be happy to post one here.
---

--------- Hi John, I don't see the new schematic on adse =( Remember how
you couldn't see mine? Looks like the same thing is happening. Please, I
would like to see it =)
If I could get away without the need for an additional IC, I'd be happy.
But if I need it I need it... but I'll probably end up somehow wiring up a
556 rather than two separate 555's. That'd be alright wouldn't it?



The two 15V zener diodes across the motor opposite each other is critical
yeah?

---
Maybe not critical, but you need them in there to clamp any
transients caused by a change of current in the inductance of the
motor.
---

John, please confirm the correct wiring of these zeners on my schematic if
your new schematic doesn't include this section of the circuit. I'm not
100% if I understood what you meant by, "connect two 15V Zener diodes in
series opposition across the motor".

Jason.


.

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