Re: 1-in-4 sequencer freezes up--a noise problem?
- From: "ehsratcliffe@xxxxxxxxxxxxx" <ehsratcliffe@xxxxxxxxxxxxx>
- Date: 6 Jan 2007 17:04:22 -0800
ehsjr wrote:
ehsratcliffe@xxxxxxxxxxxxx wrote:
I have tried using AACircuit.ICO to draw my schematic, and haven't
As requested by others, show us your schematics.
We're working in the dark without them.
Ed
Rich Grise wrote:
<snip>
And, as Chris said, please show us a schematic of what you have now.
Good Luck!
Rich
achieved a very clear result. So I'm experimenting with posting photos
on the Net of my circuit. The address below is just one picture, so
don't bother going to it just yet. If I find one can actually get to
viewing it, I'll put the complete series of photos here, and hope they
give a complete idea of my setup.
Bruce
http://viewmorepics.myspace.com/index.cfm?fuseaction=viewImage&friendID=82939500&imageID=1618869272
Ok! That one is clear.
Add two components to it:
A diode between your + supply and 555 pin 8.
(Banded end connected to pin 8)
A 470 uF cap from pin 8 to ground.
That may fix it. Even if it does, keep working
on posting your circuits. When you can do that,
you can get help more easily.
Ed
Dear Ed,
I GOT IT! I tried your suggestions (diode and 470uF cap) and did not
find success, but when I put 470 uF caps across all three chips (CD4013
& CD4001, as well as the 555) I got some improvement. The new problem
that surfaced was that it would go to the bottom light (green) and
trigger the circuit, but then continue on back to the top amber light.
So the green light would consistently trigger the computer clock to
start timing, but if a racer blinked, they'd not see that the green
light had been ON--since the top amber light light is the one that
stayed on. I figured that the 470 cap on the 555 was holding so much
charge that it allowed the 555 to get one more clock pulse to be
delivered, even after the power to the 555 was shut off. That may not
be a correct analysis, but in any case, when I removed the 470 cap from
the 555 timer, it worked flawlessly (stopping with green light ON) 30
times in a row. I assume that means it works "consistently". Thanks
for inspiring me to fiddle with the circuit. Sorry about never getting
pictures of my circuits posted for people to see--I had two trojan
viruses that attacked last week, and some other frustrations in trying
to get my pictures posted on the net. I know that should be a simple
thing, but I never succeeded in doing it.
Thanks again for your help,
Bruce
.
- Follow-Ups:
- Prev by Date: Re: are these diodes necessary?
- Next by Date: Re: where can I find the issues about the fabrication of the microelectronics?
- Previous by thread: Using a SSR with Triac
- Next by thread: Re: 1-in-4 sequencer freezes up--a noise problem?
- Index(es):
Relevant Pages
|
