Can anyone make a recommendation?
Need to trigger 120vac (no more than 6amp loads) with 12 or 24vdc, and have the OFF delay by up to 60 seconds.
The closest I could get out of Digi-key is two units combined for over 100 dollars. I have found relay off-delay timers on ebay for less than ten bucks. But I'm not familair enough with relays to know what to look for.
For instance, used in conjunction with a std 24vdc/120vac relay, would this be fine?
http://cgi.ebay.com/SQUARE-D-9050-J...sPageNameZWD1VQQcmdZViewItem#ebayphotohosting
This next one seems perfect 3 to 300 seconds. 24vdc in, 120vac out. Am I on the right track?
http://cgi.ebay.com/New-NIB-ATC-Tim...ryZ42897QQrdZ1QQssPageNameZWD1VQQcmdZViewItem
There are many "off delay" relays available, but I notice that some off these are only "egg timers" with terminals - for manually delaying time off with a knob, like on a coffee machine.
I need a timer/relay that will automatically continue to deliver 120vac for as long as a minute after the 24vdc signal is switched off.
thanks for any advice.
Need to trigger 120vac (no more than 6amp loads) with 12 or 24vdc, and have the OFF delay by up to 60 seconds.
The closest I could get out of Digi-key is two units combined for over 100 dollars. I have found relay off-delay timers on ebay for less than ten bucks. But I'm not familair enough with relays to know what to look for.
For instance, used in conjunction with a std 24vdc/120vac relay, would this be fine?
http://cgi.ebay.com/SQUARE-D-9050-J...sPageNameZWD1VQQcmdZViewItem#ebayphotohosting
This next one seems perfect 3 to 300 seconds. 24vdc in, 120vac out. Am I on the right track?
http://cgi.ebay.com/New-NIB-ATC-Tim...ryZ42897QQrdZ1QQssPageNameZWD1VQQcmdZViewItem
There are many "off delay" relays available, but I notice that some off these are only "egg timers" with terminals - for manually delaying time off with a knob, like on a coffee machine.
I need a timer/relay that will automatically continue to deliver 120vac for as long as a minute after the 24vdc signal is switched off.
thanks for any advice.
If you like the old look the Amperite relay/delay tubes are very cool. they can switch 6V up to 115V and come with normally open/closed as well as different time delay settings. Ebay sells them as well as Tubes and More, AZ, cheap too. I think Amperite also makes ss as well. This pdf shows how to order/find the correct one.
http://www.amperite.com/Uploads/g.PDF
http://www.amperite.com/Uploads/g.PDF
I don't have very much depth in electronic skills (at least compared to what is typical here at diyaudio). I create a lot of things, but my projects are by necessity more macro engineered than micro - a variable (off) time 24vdc/120vac relay is pretty much a "black box" utility for me.
The second link that I posted would be just perfect, except that upon closer examination, it's only 120vac input. Now I can stick a std 12/120 relay upstream of this, but now It's getting messily complicated and expensive again.
Any chance that there is a circuit diagram on the net for a small component-count method of doing this? I'd like to make it knob adjustable to about two minutes ideally.
Thanks so much for the suggestions.
The second link that I posted would be just perfect, except that upon closer examination, it's only 120vac input. Now I can stick a std 12/120 relay upstream of this, but now It's getting messily complicated and expensive again.
Any chance that there is a circuit diagram on the net for a small component-count method of doing this? I'd like to make it knob adjustable to about two minutes ideally.
Thanks so much for the suggestions.
Check out page 9 of the TI 555 timer datasheet.
The values of Ra and the capacitor determine the time constant and thus the delay.
http://focus.ti.com/lit/ds/symlink/na555.pdf
The values of Ra and the capacitor determine the time constant and thus the delay.
http://focus.ti.com/lit/ds/symlink/na555.pdf
I found it!!
(..and that was a bumper sticker in the seventies -- man I wish the rapture would just hurry up and deliver some of these idiots)
http://cgi.ebay.com/DAYTON-6A855-TI...4399929QQihZ001QQcategoryZ78208QQcmdZViewItem
(and he didn't even try to bend me over the couch for the shipping costs!)
I did say that this was "black box" engineering for me. And this is a heck of a black box for anyone interested in monkeying with this sort of thing. Use the right little SS relay and you could combine this with just about anything to control a circuit.
Anyway, thanks for the help here.
(..and that was a bumper sticker in the seventies -- man I wish the rapture would just hurry up and deliver some of these idiots)
http://cgi.ebay.com/DAYTON-6A855-TI...4399929QQihZ001QQcategoryZ78208QQcmdZViewItem
(and he didn't even try to bend me over the couch for the shipping costs!)
I did say that this was "black box" engineering for me. And this is a heck of a black box for anyone interested in monkeying with this sort of thing. Use the right little SS relay and you could combine this with just about anything to control a circuit.
Anyway, thanks for the help here.
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