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What Size Capacitor for 2 Minuite Output?


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tmacie 
Member - Posts: 35
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Posted: February 19, 2015 at 6:21 PM / IP Logged  
Anyone know what size capacitor I would need to get about a 2 minute output using this relay wiring?
https://www.the12volt.com/relays/relaydiagram22.html
Thanks,
Travis
oldspark 
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Posted: February 19, 2015 at 8:07 PM / IP Logged  
Forget it!
But assuming 12V & a 60 Ohm relay coil and a relay dropout of ~4.5V, a 2F capacitor.
tmacie 
Member - Posts: 35
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Joined: August 22, 2005
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Posted: February 19, 2015 at 8:31 PM / IP Logged  
Bah! I've got 3 or 4 hanging around!
Ok, so that's out. Here's what I'm trying to do:
I want to activate a relay by pushing a momentary switch, I want it to stay on for 2 minutes then shutoff if no more input is given.
Any help would be greatly appreciated!
Thanks,
Travis
series vii 
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Posted: February 19, 2015 at 8:55 PM / IP Logged  
DEI 528T timer.
I believe two minutes is the max amount of set time. Have used one for years on my bed lights with a neg alarm aux. Easy to use, install and find. Should be under $20 with shipping.
'14 F-150 Platinum.
Not giving up my class A/B yet...
tmacie 
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Joined: August 22, 2005
Location: United States
Posted: February 19, 2015 at 9:02 PM / IP Logged  
1 min is max for the 528t. I need more than that.
Travis
series vii 
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Posted: February 19, 2015 at 9:06 PM / IP Logged  
Just remembered, my alarm is 60 sec out and the timer is another 60sec.
Giving me the 2 minutes.
Another option is the Inpower SSR timers available on Waytek's site.
'14 F-150 Platinum.
Not giving up my class A/B yet...
oldspark 
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Posted: February 19, 2015 at 9:09 PM / IP Logged  
Search for timer circuits. There are so many!
tmacie 
Member - Posts: 35
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Joined: August 22, 2005
Location: United States
Posted: February 19, 2015 at 9:21 PM / IP Logged  
I also need the relay to stay active when the truck is running....
oldspark 
Gold - Posts: 4,913
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Location: Australia
Posted: February 19, 2015 at 9:27 PM / IP Logged  
... and yet turn off after 2 minutes...
What Size Capacitor for 2 Minuite Output? -- posted image.
tmacie 
Member - Posts: 35
Member spacespace
Joined: August 22, 2005
Location: United States
Posted: February 19, 2015 at 9:50 PM / IP Logged  
After 2 minutes with the truck off. If the truck is on, and the button is pushed the relay would activate and stay activated, until 2 min after the truck is shut off.
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