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0.5volt trying to power 12v device?

Printed From: the12volt.com
Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=18531
Printed Date: May 08, 2025 at 11:37 PM


Topic: 0.5volt trying to power 12v device?

Posted By: HlH 3
Subject: 0.5volt trying to power 12v device?
Date Posted: September 05, 2003 at 4:30 PM

Hi,
I have a .5 volt signal wire that needs to power a 12v car device.  I thought of course put a relay on it, but from what I have been able to see - a 0.5v signal wont trigger a relay

Is there a special relay or something I can buy from radioshack or somewhere local to get this to work, or any ideas?

THANKS




Replies:

Posted By: auex
Date Posted: September 05, 2003 at 5:15 PM
Just curious, what are you trying to accomplish, and what are you using that supplies the .5V?

-------------
Certified Security Specialist
Always check info with a digital multimeter.
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Posted By: HlH 3
Date Posted: September 05, 2003 at 5:28 PM

auex]J wrote:

st curious, what are you trying to accomplish, and what are you using that supplies the .5V?

I am using a summit racing RPM switch, which is needing to trigger/power a vacuum solenoid for an intake manifold at 5300rpm. 

The activation LED comes on at 5300rpm showing that it is working properly - and voltage goes from 0 to 0.5v so I know it's working... hardly.  I checked the ground, blah blah





Posted By: auex
Date Posted: September 05, 2003 at 5:47 PM
That doesn't sound like it is working. It should put out 12V, is it part#     SUM-830449 ? I also noticed it said some bs about a protection circuitry and internal fuse. Have you tried to meter the output when the when it is disconnected?

-------------
Certified Security Specialist
Always check info with a digital multimeter.
I promise to be good.
Tell Darwin I sent you.

I've been sick lately, sorry I won't be on much.




Posted By: BulletTooth
Date Posted: September 05, 2003 at 7:40 PM
You might wanna try a simple transistor circuit, the only problem is that you will need about 0.65V to activate a transistor, however it might work with a 0.5V, you'll have to try. Let us know if you need any further help.





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