On 2013-09-05, Guv Bob wrote:
"John Fields" wrote in message ...
On Wed, 4 Sep 2013 11:21:01 -0700, "Guv Bob"
wrote:

"dave" wrote in message m...
On 09/04/2013 01:17 AM, Jan Panteltje wrote:
On a sunny day (Tue, 3 Sep 2013 16:01:31 -0700) it happened "Guv Bob"
wrote in
:

Will this work?

Size R & C so that when switch closes, relay energizes after 5 =
seconds, and remains energized until switch is opened.

http://img839.imageshack.us/img839/4650/uh3.gif

Yes, but 5 seconds needs a big C.


http://www.ebay.com/sch/i.html?_odkw...=0&_fr om=R40

Thanks Dave. That's exactly what I have been looking for. Problem is I can only find these or similar units in the $5-20 range from China (2-3 weeks). Omron and others available in US are $70+

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Why can't you use Jasen Betts' circuit?

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JF

What circuit is that? I don't see it.

It was an ascii-art sketch I posted when you asked about the 555 chip

you've got most of the parts you need in that Velleman kit

in------+-------------+
| |
| . . . .|. . . .
| . VCC(8) .
| . .
+-----+-------RES(4) OUT(3)------ out
_|_ | . 555 .
D1 A [R1] +---TH(6) DIS(7)--
'T` | | . .
+-----+---+---TR(2) CV(5)--
| . .
C1 ===== . GND(1) .
| . . . .|. . . .
| |
----+-------------+---
ground


U1 LMC555 / 7555 etc...
D1 1N914 / 1N4148
C1 10uF
R1 470K

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š‚šƒ 100% natural

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