Looking for a Low Cost On Delay Timer

On a sunny day (Thu, 29 Aug 2013 14:26:57 -0400) it happened Spehro Pefhany wrote in :

I am assuming other loads on the 12 V supply. If it makes you happy, add a signal light bulb. :-)

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I couldn't find the spec's for the switch; do you have a link?

No, I found this on ebay looking for something else.

But Google found the spec for the relay:

(unless you ment relay)

seconds. Then output will go back off and stay off until the input goes to zero. Then cycle starts again.

one with NC contacts. Tons of stuff $100+, but for this application, it has to be under $20.

Thanks hamilton. There are a bunch of these from various mfr on ebay but all come from China -- 3-4 weeks.

seconds. Then output will go back off and stay off until the input goes to zero. Then cycle starts again.

one with NC contacts. Tons of stuff $100+, but for this application, it has to be under $20.

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...

Welp.... as I was connecting the last component, my super strength kicked in and I broke diode D1. Even so, I connected it to 12V. The LED came on and stayed on all the time, regardless of how either VR is set. NO stays open and never switches.

So I figured what the heck.... I pulled out D2 and installed it for D1, then jumpered that loose end of R1 to pin 8. Same result, only now the LED doesn't energize.

Rather than keep monkeying around with this one, I'll get another one at $5 and be more careful this time.... and have a handful of spare parts.

Stay tuned....

Yes, I have to think twice, do I save 1/2 the cost or do I need it now.

hamilton

PS: This is what I was looking for, when I found the Delay-Timer-Module:

This I'll wait 2-3 weeks for.

Will this work?

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

On a sunny day (Tue, 3 Sep 2013 16:01:31 -0700) it happened "Guv Bob" wrote in :

Yes, but 5 seconds needs a big C.

Bob"

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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?

Bob"

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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+

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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?? 100% natural 

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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 D1 1N914 C1 10uF R1 470K

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JF

"Guv Bob"

after 5 =

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+

.|. . . .

Thanks, fellows. Sorry for my ignorance -- I tried viewing this in fixed pitch and still can't make out the connections. Any way to sketch it out and upload it somewhere or post it at one of the binary groups? These are active... alt.binaries.schematics.electronics,alt.binaries.schematics.electronic Bob

John mangled it when he re-posted it. the one I posted at about the same time should be readable

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?? 100% natural 

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On Fri, 6 Sep 2013 21:06:49 -0700, "Guv Bob" wrote:

--- Better yet, here's the LTspice circuit list:

Version 4 SHEET 1 880 680 WIRE -288 80 -432 80 WIRE -128 80 -288 80 WIRE 224 80 -128 80 WIRE -288 112 -288 80 WIRE 288 112 -96 112 WIRE -32 176 -160 176 WIRE 224 176 224 80 WIRE 224 176 192 176 WIRE 288 176 288 112 WIRE -288 240 -288 192 WIRE -64 240 -288 240 WIRE -32 240 -64 240 WIRE -432 256 -432 80 WIRE -400 256 -432 256 WIRE -288 256 -288 240 WIRE -288 256 -336 256 WIRE 288 288 288 256 WIRE -96 304 -96 112 WIRE -32 304 -96 304 WIRE 224 304 192 304 WIRE -432 320 -432 256 WIRE -288 336 -288 256 WIRE -128 368 -128 80 WIRE -32 368 -128 368 WIRE -64 432 -64 240 WIRE 224 432 224 304 WIRE 224 432 -64 432 WIRE -432 464 -432 400 WIRE -288 464 -288 400 WIRE -288 464 -432 464 WIRE -160 464 -160 176 WIRE -160 464 -288 464 WIRE 288 464 288 352 WIRE 288 464 -160 464 WIRE -432 528 -432 464 FLAG -432 528 0 SYMBOL Misc\\NE555 80 272 R0 SYMATTR InstName U1 SYMBOL voltage -432 304 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 WINDOW 3 24 104 Invisible 2 SYMATTR Value PULSE(0 12 1 1e-6 1e-6 10) SYMATTR InstName V2 SYMBOL res 272 160 R0 SYMATTR InstName R2 SYMATTR Value 270 SYMBOL cap -304 336 R0 SYMATTR InstName C2 SYMATTR Value 10µ SYMBOL res -272 208 R180 WINDOW 0 -50 67 Left 2 WINDOW 3 -59 34 Left 2 SYMATTR InstName R3 SYMATTR Value 470k SYMBOL LED 272 288 R0 SYMATTR InstName D1 SYMATTR Value NSCW100 SYMBOL diode -336 240 R90 WINDOW 0 -38 25 VBottom 2 WINDOW 3 -34 28 VTop 2 SYMATTR InstName D2 SYMATTR Value 1N4148 TEXT -408 496 Left 2 !.tran 15

If you don't already have it, you can get LTspice for free at:

Once you download the program, copy the circuit list and save it to a file with a .asc extension, then left-click on the file.

LTspice should find the file, load it, and display the schematic.

If it doesn't, then launch LTspice, navigate to the saved file and click on it.

Once the schematic is displayed you can edit it in any way you wish, and if you want to run it right-click anywhere on the background of the schematic and left-click on RUN when the menu pops up.

-- JF

John & Jasen, thanks for this and all the other great tips!!!

fixed pitch and still can't make out the connections. Any way to sketch it out and upload it somewhere or post it at one of the binary groups? These are active...