Looking for a Low Cost On Delay Timer

[Jan Panteltje]

On a sunny day (Thu, 29 Aug 2013 10:18:17 -0700) it happened "Guv Bob"
<guvbob2003@yahooooooooooooooo.com> wrote in
<Ku2dnWMSI7g8H4LPnZ2dnUVZ_rmdnZ2d@earthlink.com>:

When 12VDC is applied to the input, I need a 12VDC output for 5 =
seconds.
+12

|
-----------------------------------------------------|
| | | |
| --- | ===
| / \ 1N4001 Load --- 1000uF / 16V
| 1u poly --- D2 | | C2
=== C1 |-------------- ///
| |--- d
-------------| | IRLZ34
| 4M7 | |--- s T1
[ ] R --- |
| / \ D1 ///
/// ---
| 1N4148
///

When power is off C1 is discharged.
When power comes on the gate of MOSFET T1 is posive via C1,
and C1 slowly charges via R1,
R.C time, select a suitable capacitor and resistor.
The gate voltage slowly drops, and then T1 stops conducting.
When power goes off, then C1 is discharged again via D1.

D2 and C2 are needed to prevent transients on the drain (load line) of T1 piercing the gate electrode isolation layer.

IRLZ34 is a logic level (2 to 3 V gate on IIRC) MOSFET.

Alternative solution:
12 V light bulb -> wakes up cat -> cat drinks from cup -> cup get lighter -> balance turns -> ball rolls, hits bell -> you wake up, and swtich of the power.

 

[Spehro Pefhany]

On Thu, 29 Aug 2013 10:18:17 -0700, "Guv Bob"
<guvbob2003@yahooooooooooooooo.com> wrote:

"Guv Bob" <guvbob2003@yahooooooooooooooo.com> wrote in message news:lKednb_fcOnJU4bPnZ2dnUVZ_oWdnZ2d@earthlink.com...
"Spehro Pefhany" <speffSNIP@interlogDOTyou.knowwhat> wrote in message news:l20n191irlkc14q13f9on9l0tctgtihjva@4ax.com...
On Sun, 25 Aug 2013 23:29:54 -0700, "Guv Bob"
guvbob2003@yahooooooooooooooo.com> wrote:

"Guv Bob" <guvbob2003@yahooooooooooooooo.com> wrote in message news:1_udnQ7rBpNjRo7PnZ2dnUVZ_sidnZ2d@earthlink.com...
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/0/minikits/manuals/manual_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/0/minikits/manuals/manual_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.

 

[Spehro Pefhany]

On Thu, 29 Aug 2013 18:02:56 GMT, Jan Panteltje
<pNaonStpealmtje@yahoo.com> wrote:

On a sunny day (Thu, 29 Aug 2013 10:18:17 -0700) it happened "Guv Bob"
guvbob2003@yahooooooooooooooo.com> wrote in
Ku2dnWMSI7g8H4LPnZ2dnUVZ_rmdnZ2d@earthlink.com>:

When 12VDC is applied to the input, I need a 12VDC output for 5 =
seconds.
+12
|
-----------------------------------------------------|
| | | |
| --- | ===
| / \ 1N4001 Load --- 1000uF / 16V
| 1u poly --- D2 | | C2
=== C1 |-------------- ///
| |--- d
-------------| | IRLZ34
| 4M7 | |--- s T1
[ ] R --- |
| / \ D1 ///
/// ---
| 1N4148
///

What discharges that 1000uF (and the 1uF) when the transistor isn't
turned on? Or are you assuming push-pull drive on the 12V?

When power is off C1 is discharged.
When power comes on the gate of MOSFET T1 is posive via C1,
and C1 slowly charges via R1,
R.C time, select a suitable capacitor and resistor.
The gate voltage slowly drops, and then T1 stops conducting.
When power goes off, then C1 is discharged again via D1.

D2 and C2 are needed to prevent transients on the drain (load line) of T1 piercing the gate electrode isolation layer.

Maybe replace C2 with a resistor and put 1K/12V zener before the cap.

IRLZ34 is a logic level (2 to 3 V gate on IIRC) MOSFET.

Alternative solution:
12 V light bulb -> wakes up cat -> cat drinks from cup -> cup get lighter -> balance turns -> ball rolls, hits bell -> you wake up, and swtich of the power.

12v heater boils off water so weight on microswitch is reduced. When
power is removed relay N.C. contact allows solenoid valve/flow switch
to refill water container. Oh, and wire in a beeper to bother the cat.

 

[Jan Panteltje]

On a sunny day (Thu, 29 Aug 2013 14:26:57 -0400) it happened Spehro Pefhany
<speffSNIP@interlogDOTyou.knowwhat> wrote in
<qp3v19p2m5shktb4c8c8evhtluqbq8svu6@4ax.com>:

On Thu, 29 Aug 2013 18:02:56 GMT, Jan Panteltje
pNaonStpealmtje@yahoo.com> wrote:

On a sunny day (Thu, 29 Aug 2013 10:18:17 -0700) it happened "Guv Bob"
guvbob2003@yahooooooooooooooo.com> wrote in
Ku2dnWMSI7g8H4LPnZ2dnUVZ_rmdnZ2d@earthlink.com>:

When 12VDC is applied to the input, I need a 12VDC output for 5 =
seconds.
+12
|
-----------------------------------------------------|
| | | | |
| --- | bulb ===
| / \ 1N4001 Load | 12V --- 1000uF / 16V
| 1u poly --- D2 | /// 1W | C2
=== C1 |-------------- ///
| |--- d
-------------| | IRLZ34
| 4M7 | |--- s T1
[ ] R --- |
| / \ D1 ///
/// ---
| 1N4148
///


What discharges that 1000uF (and the 1uF) when the transistor isn't
turned on? Or are you assuming push-pull drive on the 12V?

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

 

[hamilton]

On 8/20/2013 3:12 PM, Guv Bob wrote:

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.

http://www.ebay.com/itm/New-DC-12V-Delay-Timer-Switch-Adjustable-Module-0-to-10-Second/190880088204?_trksid=p2047675.m2109&_trkparms=aid%3D555003%26algo%3DPW.CAT%26ao%3D1%26asc%3D142%26meid%3D962092136014583387%26pid%3D100010%26prg%3D1076%26rk%3D1%26rkt%3D15%26sd%3D251330081051%26

 

[John Fields]

On Sat, 31 Aug 2013 12:28:26 -0600, hamilton <hamilton@nothere.com>
wrote:

On 8/20/2013 3:12 PM, Guv Bob wrote:
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.

http://www.ebay.com/itm/New-DC-12V-Delay-Timer-Switch-Adjustable-Module-0-to-10-Second/190880088204?_trksid=p2047675.m2109&_trkparms=aid%3D555003%26algo%3DPW.CAT%26ao%3D1%26asc%3D142%26meid%3D962092136014583387%26pid%3D100010%26prg%3D1076%26rk%3D1%26rkt%3D15%26sd%3D251330081051%26

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

--
JF

 

[hamilton]

On 8/31/2013 5:29 PM, John Fields wrote:

On Sat, 31 Aug 2013 12:28:26 -0600, hamilton <hamilton@nothere.com
wrote:

On 8/20/2013 3:12 PM, Guv Bob wrote:
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.

http://www.ebay.com/itm/New-DC-12V-Delay-Timer-Switch-Adjustable-Module-0-to-10-Second/190880088204?_trksid=p2047675.m2109&_trkparms=aid%3D555003%26algo%3DPW.CAT%26ao%3D1%26asc%3D142%26meid%3D962092136014583387%26pid%3D100010%26prg%3D1076%26rk%3D1%26rkt%3D15%26sd%3D251330081051%26

---
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:
http://www.mycomkits.com/reference/Songle_SRD%28T73%29_Relay.pdf

(unless you ment relay)

 

[Guv Bob]

"hamilton" <hamilton@nothere.com> wrote in message news:kvtckq$6s7$1@dont-email.me...

On 8/20/2013 3:12 PM, Guv Bob wrote:
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.

http://www.ebay.com/itm/New-DC-12V-Delay-Timer-Switch-Adjustable-Module-0-to-10-Second/190880088204?_trksid=p2047675.m2109&_trkparms=aid%3D555003%26algo%3DPW.CAT%26ao%3D1%26asc%3D142%26meid%3D962092136014583387%26pid%3D100010%26prg%3D1076%26rk%3D1%26rkt%3D15%26sd%3D251330081051%26

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

 

[Guv Bob]

"Spehro Pefhany" <speffSNIP@interlogDOTyou.knowwhat> wrote in message news:0n2v19dqcu9kb569k6ul3s2mktal1tr4m2@4ax.com...

On Thu, 29 Aug 2013 10:18:17 -0700, "Guv Bob"
guvbob2003@yahooooooooooooooo.com> wrote:

"Guv Bob" <guvbob2003@yahooooooooooooooo.com> wrote in message news:lKednb_fcOnJU4bPnZ2dnUVZ_oWdnZ2d@earthlink.com...
"Spehro Pefhany" <speffSNIP@interlogDOTyou.knowwhat> wrote in message news:l20n191irlkc14q13f9on9l0tctgtihjva@4ax.com...
On Sun, 25 Aug 2013 23:29:54 -0700, "Guv Bob"
guvbob2003@yahooooooooooooooo.com> wrote:

"Guv Bob" <guvbob2003@yahooooooooooooooo.com> wrote in message news:1_udnQ7rBpNjRo7PnZ2dnUVZ_sidnZ2d@earthlink.com...
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/0/minikits/manuals/manual_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/0/minikits/manuals/manual_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.

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.

http://www.vellemanusa.com/downloads/0/minikits/manuals/manual_mk111.pdf

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....

 

[hamilton]

On 9/3/2013 1:30 PM, Guv Bob wrote:

"hamilton" <hamilton@nothere.com> wrote in message news:kvtckq$6s7$1@dont-email.me...
On 8/20/2013 3:12 PM, Guv Bob wrote:
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.

http://www.ebay.com/itm/New-DC-12V-Delay-Timer-Switch-Adjustable-Module-0-to-10-Second/190880088204?_trksid=p2047675.m2109&_trkparms=aid%3D555003%26algo%3DPW.CAT%26ao%3D1%26asc%3D142%26meid%3D962092136014583387%26pid%3D100010%26prg%3D1076%26rk%3D1%26rkt%3D15%26sd%3D251330081051%26

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

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:

http://www.ebay.com/itm/IOS-Android-Smartphone-control-4-Channel-Wireless-Relay-Kit-for-Cars-WIFI-AP/321191029473?_trksid=p2047675.m2109&_trkparms=aid%3D555003%26algo%3DPW.CAT%26ao%3D1%26asc%3D142%26meid%3D962216198496163743%26pid%3D100010%26prg%3D1076%26rk%3D5%26rkt%3D15%26sd%3D190587779059%26

This I'll wait 2-3 weeks for.

 

[Guv Bob]

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

 

[Jan Panteltje]

On a sunny day (Tue, 3 Sep 2013 16:01:31 -0700) it happened "Guv Bob"
<guvbob2003@yahooooooooooooooo.com> wrote in
<NbWdnYVOc48K97vPnZ2dnUVZ_rWdnZ2d@earthlink.com>:

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.

 

[dave]

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"
guvbob2003@yahooooooooooooooo.com> wrote in
NbWdnYVOc48K97vPnZ2dnUVZ_rWdnZ2d@earthlink.com>:

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=omron+relay+switch&_fspt=1&_sop=12&_osacat=0&_mPrRngCbx=1&_trksid=p2045573.m570.l1313.TR0.TRC0.Xomron+delay&_nkw=omron+delay&_sacat=0&_from=R40

 

[Guv Bob]

"dave" <ricketzz@earthlink.net> wrote in message news:6uednZvbC998sbrPnZ2dnUVZ_vqdnZ2d@earthlink.com...

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"
guvbob2003@yahooooooooooooooo.com> wrote in
NbWdnYVOc48K97vPnZ2dnUVZ_rWdnZ2d@earthlink.com>:

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=omron+relay+switch&_fspt=1&_sop=12&_osacat=0&_mPrRngCbx=1&_trksid=p2045573.m570.l1313.TR0.TRC0.Xomron+delay&_nkw=omron+delay&_sacat=0&_from=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+

 

[John Fields]

On Wed, 4 Sep 2013 11:21:01 -0700, "Guv Bob"
<guvbob2003@yahooooooooooooooo.com> wrote:

"dave" <ricketzz@earthlink.net> wrote in message news:6uednZvbC998sbrPnZ2dnUVZ_vqdnZ2d@earthlink.com...
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"
guvbob2003@yahooooooooooooooo.com> wrote in
NbWdnYVOc48K97vPnZ2dnUVZ_rWdnZ2d@earthlink.com>:

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=omron+relay+switch&_fspt=1&_sop=12&_osacat=0&_mPrRngCbx=1&_trksid=p2045573.m570.l1313.TR0.TRC0.Xomron+delay&_nkw=omron+delay&_sacat=0&_from=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+

---
Why can't you use Jasen Betts' circuit?

--
JF

 

[Guv Bob]

"John Fields" <jfields@austininstruments.com> wrote in message news:tldg29h2pjcv80iqsuvhsctse62lsu6pr4@4ax.com...

On Wed, 4 Sep 2013 11:21:01 -0700, "Guv Bob"
guvbob2003@yahooooooooooooooo.com> wrote:

"dave" <ricketzz@earthlink.net> wrote in message news:6uednZvbC998sbrPnZ2dnUVZ_vqdnZ2d@earthlink.com...
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"
guvbob2003@yahooooooooooooooo.com> wrote in
NbWdnYVOc48K97vPnZ2dnUVZ_rWdnZ2d@earthlink.com>:

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=omron+relay+switch&_fspt=1&_sop=12&_osacat=0&_mPrRngCbx=1&_trksid=p2045573.m570.l1313.TR0.TRC0.Xomron+delay&_nkw=omron+delay&_sacat=0&_from=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+

---
Why can't you use Jasen Betts' circuit?

--
JF

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

 

[Jasen Betts]

On 2013-09-05, Guv Bob <guvbob2003@yahooooooooooooooo.com> wrote:

"John Fields" <jfields@austininstruments.com> wrote in message news:tldg29h2pjcv80iqsuvhsctse62lsu6pr4@4ax.com...
On Wed, 4 Sep 2013 11:21:01 -0700, "Guv Bob"
guvbob2003@yahooooooooooooooo.com> wrote:

"dave" <ricketzz@earthlink.net> wrote in message news:6uednZvbC998sbrPnZ2dnUVZ_vqdnZ2d@earthlink.com...
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"
guvbob2003@yahooooooooooooooo.com> wrote in
NbWdnYVOc48K97vPnZ2dnUVZ_rWdnZ2d@earthlink.com>:

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=omron+relay+switch&_fspt=1&_sop=12&_osacat=0&_mPrRngCbx=1&_trksid=p2045573.m570.l1313.TR0.TRC0.Xomron+delay&_nkw=omron+delay&_sacat=0&_from=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+

---
Why can't you use Jasen Betts' circuit?

--
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

--
⚂⚃ 100% natural

--- news://freenews.netfront.net/ - complaints: news@netfront.net ---

 

[John Fields]

On Thu, 5 Sep 2013 12:24:41 -0700, "Guv Bob"
<guvbob2003@yahooooooooooooooo.com> wrote:

"John Fields" <jfields@austininstruments.com> wrote in message news:tldg29h2pjcv80iqsuvhsctse62lsu6pr4@4ax.com...
On Wed, 4 Sep 2013 11:21:01 -0700, "Guv Bob"
guvbob2003@yahooooooooooooooo.com> wrote:

"dave" <ricketzz@earthlink.net> wrote in message news:6uednZvbC998sbrPnZ2dnUVZ_vqdnZ2d@earthlink.com...
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"
guvbob2003@yahooooooooooooooo.com> wrote in
NbWdnYVOc48K97vPnZ2dnUVZ_rWdnZ2d@earthlink.com>:

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=omron+relay+switch&_fspt=1&_sop=12&_osacat=0&_mPrRngCbx=1&_trksid=p2045573.m570.l1313.TR0.TRC0.Xomron+delay&_nkw=omron+delay&_sacat=0&_from=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+

---
Why can't you use Jasen Betts' circuit?

--
JF

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

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

--
JF

 

[Jasen Betts]

On 2013-09-07, Guv Bob <guvbob2003@yahooooooooooooooo.com> wrote:

"John Fields" <jfields@austininstruments.com> wrote in message news0tk29981ihs443ssgh9t3j90lq02jkgv0@4ax.com...
On Thu, 5 Sep 2013 12:24:41 -0700, "Guv Bob"
guvbob2003@yahooooooooooooooo.com> wrote:

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

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

Thanks, fellows. Sorry for my ignorance --
I tried viewing this in fixed pitch and still can't make out the connections.

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

--
⚂⚃ 100% natural

--- news://freenews.netfront.net/ - complaints: news@netfront.net ---

 

[Guv Bob]

"John Fields" <jfields@austininstruments.com> wrote in message news0tk29981ihs443ssgh9t3j90lq02jkgv0@4ax.com...

On Thu, 5 Sep 2013 12:24:41 -0700, "Guv Bob"
guvbob2003@yahooooooooooooooo.com> wrote:

"John Fields" <jfields@austininstruments.com> wrote in message news:tldg29h2pjcv80iqsuvhsctse62lsu6pr4@4ax.com...
On Wed, 4 Sep 2013 11:21:01 -0700, "Guv Bob"
guvbob2003@yahooooooooooooooo.com> wrote:

"dave" <ricketzz@earthlink.net> wrote in message news:6uednZvbC998sbrPnZ2dnUVZ_vqdnZ2d@earthlink.com...
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"
guvbob2003@yahooooooooooooooo.com> wrote in
NbWdnYVOc48K97vPnZ2dnUVZ_rWdnZ2d@earthlink.com>:

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=omron+relay+switch&_fspt=1&_sop=12&_osacat=0&_mPrRngCbx=1&_trksid=p2045573.m570.l1313.TR0.TRC0.Xomron+delay&_nkw=omron+delay&_sacat=0&_from=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+

---
Why can't you use Jasen Betts' circuit?

--
JF

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

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

--
JF

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