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9 volt to 12 volt jump


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fozzz 
Member - Posts: 10
Member spacespace
Joined: October 30, 2005
Location: Canada
Posted: August 18, 2006 at 6:23 PM / IP Logged  

I have a low amperage 9volt signal that i need boosted to a 12 volt signal. I have some standard relays but there isnt enough voltage/amperage to turn it on. Can I use a transistor to bump the voltage/ampreage up?

The real trick is that I cannot have this transistor turn on until the signal reaches 9 volts. When the signal is at rest, it sits at around 5.5 or 6 volts. C

Can this be done??

Please help me!

techguy688 
Copper - Posts: 55
Copper spacespace
Joined: November 07, 2004
Location: United States
Posted: August 18, 2006 at 8:10 PM / IP Logged  
use a 9vdc relay. 9 vdc on the coil.
                   12 vdc across the common and NO or NC
Just because you've done something for a long time doesn't mean you're any good at it.
Cable Ties Rock!
fozzz 
Member - Posts: 10
Member spacespace
Joined: October 30, 2005
Location: Canada
Posted: August 19, 2006 at 9:14 AM / IP Logged  

Are 9volt relays common? My local dealer only has 12 volt ones. I also looked in radioshack. Same result.

hotwaterwizard 
Silver - Posts: 1,350
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Joined: December 11, 2003
Location: California, United States
Posted: August 19, 2006 at 11:00 PM / IP Logged  

Mouser has them. Cheap too!

http://www.mouser.com/search/ProductDetail.aspx?R=FTR-P4CN009W1virtualkey52910000

John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Mad Scientists 
Silver - Posts: 380
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Joined: February 07, 2004
Location: United States
Posted: August 20, 2006 at 5:43 PM / IP Logged  

Because of your at rest voltage I'd recommend a comparator circuit.. something like this..

http://home.cogeco.ca/~rpaisley4/Comparators.html

I'd think that a nine volt relay would maybe/maybe not trigger on 5-6 volts.

Jim

hotwaterwizard 
Silver - Posts: 1,350
Silver spacespace
Joined: December 11, 2003
Location: California, United States
Posted: August 20, 2006 at 8:03 PM / IP Logged  

There is a circuit on this page that may help you out.

Lowest cost for 5V only supply with higher voltage relay coil

http://www.piclist.com/techref/io/relays.htm

John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
hotwaterwizard 
Silver - Posts: 1,350
Silver spacespace
Joined: December 11, 2003
Location: California, United States
Posted: August 20, 2006 at 8:38 PM / IP Logged  

You could play with the Resistor on this circuit to activate at 9v just put a Variable Resistor  instead of the resistor.

Put your 9v on the red arrow and tie the grounds together.

9 volt to 12 volt jump -- posted image.

Here is the Modified Circuit.

9 volt to 12 volt jump -- posted image.

John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

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