Help with a DC circuit

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vapsterinventor Active Contributor Join Date: Mar 2008 Posts: 24	Help with a DC circuit 01/04/2009 10:40 AM
	I am working on a relatively simple DC circuit. The circuit is 3 volts and 3 amps going to a variable resistor and has a SPDT switch. I would like to put in a delay mechanism around the switch for five minutes. This would allow the current to flow through the first pole of the switch until the five minutes is up and then transfer the current to the second pole. Is there such a switch or what type(s) of components do I need to install in the circuitry to accomplish this? Stumped.
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user-deleted-1105 Guru Join Date: May 2007 Location: Harlow England Posts: 16512 Good Answers: 670	#1 Re: Help with a DC circuit 01/04/2009 11:41 AM
	I think you can get a 555 timer chip which will work down at 3v, the output could drive a relay to switch circuits. google "555 timer 3v" there will be tons of stuff. You will need a few resistors and capacitors. Del __________________ health warning: These posts may contain traces of nut.
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sb Guru Join Date: Mar 2007 Posts: 2550 Good Answers: 103	#2 In reply to #1 Re: Help with a DC circuit 01/04/2009 9:26 PM
	555 is still on? I remember using them with OPAMP during my good old engineering days for my project. __________________ Fantastic ideas for a Fantastic World, I make the illogical logical.They put me in cars,they put me in yer tv.They put me in stereos and those little radios you stick in your ears.They even put me in watches, they have teeny gremlins for your watches
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user-deleted-1105 Guru Join Date: May 2007 Location: Harlow England Posts: 16512 Good Answers: 670	#4 In reply to #2 Re: Help with a DC circuit 01/05/2009 3:19 AM
	yup...they are still ticking away. Don't much like em' myself, they never quite seem to do what you want. I'd rather arse about with some CMOS gates and a hand full of Rs & Cs, or a microcontroller. But the hobyists love 'em. Del __________________ health warning: These posts may contain traces of nut.
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ffej Guru Join Date: May 2007 Location: Geelong, Australia Posts: 1084 Good Answers: 54	#3 Re: Help with a DC circuit 01/04/2009 11:51 PM
	There are usually many ways to solve a problem. To pick the most appropriate solution it helps to know what you're building, why you're building it and what's your level of expertise. Is it a 3V supply or are you supplying 3V to something. What accuracy do you need? Are you building many? Do you care about cost? Is there a restriction on size, heat etc? __________________ If there's something you don't understand...Then a wizard did it. As heard on "The Simpsons".
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Duce Active Contributor Join Date: Jul 2007 Location: Houston, TX Posts: 23	#5 Re: Help with a DC circuit 01/05/2009 4:15 PM
	Drop a C note on one of these and let your imagination run wild. http://www.bb-elec.com/product_multi_family.asp?MultiFamilyId=39&Trail=32&TrailType=Top
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