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Old 20th November 2004, 08:20 AM   #1
oaks is offline oaks  Argentina
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Default How to run an AC mic pre from batteries

Hello to all!

Im from Argentina, and this is my first post in this forum.

My situation is this: Im trying to know how to run a Millennia HV3B microphone preamplier from batteries.

(Specifications: Power consumption, maximum :10 watts. Power requeriments: 115/230 VAC, 50/60 Hz)

http://www.mil-media.com/docs/products/hv3b.shtml


Im not a technician (I studied musical composition) but I think that for you, that have technical knowledge, is perhaps simple.

Im interested in doing next year a recording -ethnic music- in the field, with a pair of Schoeps mics and a HV3B as pre. A static situation, without movement.

Note: I have 2 portable phantom powers from Sennheiser, so it would be possible to not use the phantom power from the HV3B.

Perhaps some one of you have experienced something similar ? Could you give me some orientations on this ?

Thanks in advance!
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Old 3rd December 2004, 02:20 AM   #2
paulb is offline paulb  Canada
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There are DC to AC converters available, mainly intended for use in vehicles. You could use a 12V battery to power one of these.
If this link works for you, here is an example of what I mean:
http://www.canadiantire.ca/assortmen...=1102040300024
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Old 3rd December 2004, 02:30 AM   #3
hifi is offline hifi  Sweden
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If you go that route make sure the converter delivers full sinewaves!
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Old 14th October 2009, 08:26 AM   #4
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you can buy a 12volt to 110 volt converter, it is very easy for you, or you can made it,
CD4047 ile 12-220 volt DC-AC Basit Ä°nverter Devresi
or you can buy from there;
http://www.voltageconverters.com/220...inverters.html

Last edited by Adnancoskun; 14th October 2009 at 08:28 AM.
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Old 16th October 2009, 07:19 AM   #5
cbdb is offline cbdb  Canada
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Taking a DC voltage, converting it to 120VAC and then back to a DC voltage inside the box dosnt seem right to me. (And a pure sine wave inverter, which is what you should use, is more expensive). If you have any DIY experiance, you can open the box and see what DC voltages are used inside. Typically +/- 15 volts (and maybe a 5v for LEDs etc). And then power those rails from batteries. (yould probably be fine if you where wihtin a volt or so as long as the + and - where the same) And batteries are the cleanest power around.

The other option is to rent a battery operated mic pre. There are some good ones out there.
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Old 16th October 2009, 09:29 AM   #6
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Quote:
Originally Posted by cbdb View Post
Taking a DC voltage, converting it to 120VAC and then back to a DC voltage inside the box dosnt seem right to me. .
I'll agree with that!
And 9 watts of the things 10 watt power consumption are probably wasted in the transformer as heat.

I'd certainly suggest studying its power supply - find out what it uses - and just tap into the secondary side of the bridge rectifier(s). No need for any circuit modification.
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Old 17th October 2009, 07:02 AM   #7
cbdb is offline cbdb  Canada
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Quote:
'd certainly suggest studying its power supply - find out what it uses - and just tap into the secondary side of the bridge rectifier(s). No need for any circuit modification.
He might be wary of tinkering with such a nice, expensive piece of gear, and it will void the warranty!
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