"Spehro Pefhany" wrote in message ...
On Thu, 29 Aug 2013 10:18:17 -0700, "Guv Bob"
wrote:

"Guv Bob" wrote in message m...
"Spehro Pefhany" wrote in message ...
On Sun, 25 Aug 2013 23:29:54 -0700, "Guv Bob"
wrote:

"Guv Bob" wrote in message m...
Names can be confusing, so here's what I'm doing....

http://img43.imageshack.us/img43/7434/wvm.gif

When 12VDC is applied to the input, I need a 12VDC output for 5 seconds. Then output will go back off and stay off until the input goes to zero. Then cycle starts again.

Current for both legs is in the 10-50ma range.

A simple on-delay timer would work but I'm having trouble finding one with NC contacts. Tons of stuff $100+, but for this application, it has to be under $20.

===

Thanks for all the tips and good info. I had wanted to put something together from components but my brain is too far behind these days. I'm going to give this a shot and hopefully I'm not picking the wrong one. It's $5 at Frys...

Velleman MK111
http://www.vellemanusa.com/downloads...nual_mk111.pdf

It can be modified to do what you say you want.

- Hmmmm....... in that case, forget the electronics! ;O)


http://www.vellemanusa.com/downloads...nual_mk111.pdf

If I disconnect pin 7, would that make it a one-shot pulse?


Try leaving out R2 & RV1* and D2*, and jumper the free end of R1
(R1-D2 junction) to pin 8.


If you can't quite get 5s with RV2 cranked up all the way, increase R1
to 10K or 20K.

*optionally; if they're already in there, don't bother taking them
out.

Well, I made a real mess of the first board, thanks to a new Weller soldering iron. Ended up digging out my old Radio Shack iron which worked 10 times better - same type and wattage as the Weller. Here's the soldering job on each board....
http://img401.imageshack.us/img401/6528/9oag.jpg

Anyway, I made the changes Spehro mentioned and it works perfectly!

First I snipped the R3 out of the circut which caused the LED to act as a one-shot as needed. So with that good news, I added the jumper and now the relay is in the circuit and I am in Fat City!

FYI, on the left is the assembled board from the kit. Right shows it with the jumper added.
http://img835.imageshack.us/img835/6691/0wxx.jpg
http://img17.imageshack.us/img17/4276/g1k.gif

Thanks again to all for this very educational journey!

Bob

On a sunny day (Sun, 8 Sep 2013 22:02:46 -0700) it happened "Guv Bob"
wrote in
:

Well, I made a real mess of the first board, thanks to a new Weller =
soldering iron. Ended up digging out my old Radio Shack iron which =
worked 10 times better - same type and wattage as the Weller. Here's =
the soldering job on each board....
http://img401.imageshack.us/img401/6528/9oag.jpg

You need to work on your soldering skills.

Maybe your temperature on the weller was not right, too low?

Should be like this for example:
http://panteltje.com/pub/test_board_...e_IMG_3921.GIF

"Jan Panteltje" wrote in message \

You need to work on your soldering skills.

Maybe your temperature on the weller was not right, too low?


Thank you for your opinions.