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Steppint power down

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johnd(at)wlcwyo.com
Guest

Posted: Thu Mar 23, 2006 9:37 am Post subject: Steppint power down

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
Guest

Posted: Thu Mar 23, 2006 11:19 am Post subject: 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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deene(at)us.ibm.com
Guest

Posted: Thu Mar 23, 2006 12:45 pm Post subject: Steppint power down

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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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

Posted: Thu Mar 23, 2006 4:30 pm Post subject: Re: Steppint power down

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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_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
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