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Steppint power down

 
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johnd(at)wlcwyo.com
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PostPosted: Thu Mar 23, 2006 9:37 am    Post subject: Steppint power down Reply with quote

Hi Bob,
I have an intercom that runs on a 9 volt battery. I would like to attach
the leads to my 12 volt power source. What is a good way to step the 12
volts down to 9 volts?
Thanks

John


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peter(at)mather.com
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PostPosted: Thu Mar 23, 2006 11:19 am    Post subject: Steppint power down Reply with quote

Bob

7809 voltage regulator chip and 2 capacitors, one before, one after the
chip - google "7809 regulator" for values. Pot it in a small plastic box
with suitable connectors on flying leads

Best Regards

Peter
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deene(at)us.ibm.com
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PostPosted: Thu Mar 23, 2006 12:45 pm    Post subject: Steppint power down Reply with quote

I have built a number of these little power supplies for friends to power
their ANR headsets. I usually use a 10v 7810 3-terminal regulator
(Digikey p/n 296-1975-5-ND, TI UA7810) as Peter mentions below. I use
the 10v instead of the 9v version...either will work fine.

I solder a small 1uf capacitor between the input leads and use a 0.1uf cap
between the output leads and use the TO220 terminals as posts to solder
the input wires, caps and output wires. Then I encapsulate the whole
thing in shrink tubing. Take alook at the associated datasheet for the
device to see the TO220 package and pins and you will easily figure this
out.

Good Luck
Deene

"Peter Mather" <peter(at)mather.com>
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03/23/2006 01:16 PM
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Re: Steppint power down


Bob

7809 voltage regulator chip and 2 capacitors, one before, one after the
chip - google "7809 regulator" for values. Pot it in a small plastic box
with suitable connectors on flying leads

Best Regards

Peter
---


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Eric M. Jones



Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts

PostPosted: Thu Mar 23, 2006 4:30 pm    Post subject: Re: Steppint power down Reply with quote

Before you go cobbling together a fix--It is likely that the 9V intercom will run fine on 12V. If you can get the schematic or take a peek inside you can determine this by looking up the parts.

Is there a cigar lighter plug adapter available for it? That would be a clue.


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