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Old 15th October 2004, 05:15 PM   #1
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Default 9 volt DC to 48V DC

Hi folks,
I'm serching for a circuit to convert 9vDC to 48v DC for a mic that needs phantom power.
Sennheiser sells an adapter like this,but it's expensive, so I'd like to build one myself.
Any information on this is apreciated

Tks.

Ric
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Old 15th October 2004, 08:31 PM   #2
cgaulin is offline cgaulin  Canada
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You should look for either a charge pump(SwitchingRegulators) or DC-DC converter.

DC-DC converter are costly.


A good start could be a look at National semiconductor web site for SwitchingRegulators (step-up) .
www.national.com.
you can also search Digikey site
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Old 15th October 2004, 10:30 PM   #3
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Possible a dumb answer but couldn't you just use 5 batteries?
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Old 15th October 2004, 10:36 PM   #4
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here's a lot of info on phantom power:

http://www.hut.fi/Misc/Electronics/c..._powering.html

if you have a wall-wart which delivers AC you can use a voltage multiplier (tripler, quadrupler, whatever) -- this will be quieter than a switcher -- you can regulate 48V with a LM317HV or a TL783 (which will go to 125V)
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Old 15th October 2004, 10:38 PM   #5
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have a look at mpja.com
surplus site w lots of dc dc converters
otherwise oscillator driving multiple stages of voltage doubler
those keywords should find a cct
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Old 15th October 2004, 10:39 PM   #6
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5 batteries is an option, but since the microphone only needs 2 ma of current at 48V I thought that if the circut is not very complex, it could end up being more compact that a set of 5 batteries.
Weight is another problem. This microphone feeds a camcorder in a Steady cam mount, so weight is of outmost concern.

cheers

Ric

PD: tks for the links, folks.
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Old 15th October 2004, 11:01 PM   #7
moamps is offline moamps  Croatia
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Hi,

almost all electret mikes (I suppose that's what you've got since it needs only 2mA) work with smaller voltages. Try yours with two 9V block batteries and, say, 2k2 1% resistors. Also, you might want to bypass batteries with small block caps.

Regards,
Milan
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Old 15th October 2004, 11:10 PM   #8
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Default MK60

I do not have that luck, Moamps. The mic is a Sennheiser MK60, a beautiful shotgun that needs 48 V +_ 4V according to the manufacturer.

tks anyway.

Ric
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Old 16th October 2004, 01:32 AM   #9
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I suppose u could build an SMPSU using National's line of switchers...
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Old 16th October 2004, 04:31 AM   #10
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Default One approach

use a MAX1771. It's not the latest/greatest, but will work, has a free sample, and come in an 8-pin DIP package.
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