Battery powered phantom power ~48 volts

[boojum]

I am wondering if it is possible to build a battery box for phantom power in the 45 - 50 volt range. I am thinking of chaining five or six 9 volt batteries together in a series and then modifying a circuit like a DIY's to do the job. But, one person has explained that this would include into the design some problems that might be tricky and which he does not feel this circuit would work for nor is he sure he can modify it. This is not for stealth work as I have mics for that. It is just for powering very small cardioids which like to be driven with higher voltages, up to ~48 volts. Any help would be appreciated. I can almost read a circuit, can solder and follow instructions. I built a couple of audio amps, tuner and pre-amp many moons ago so I suppose I could get up to speed easily enough.

Thanks.

[Richard]

* Moved to appropriate sub-section

[Strungup]

I am wondering if it is possible to build a battery box for phantom power in the 45 - 50 volt range. I am thinking of chaining five or six 9 volt batteries together in a series and then modifying a circuit like a DIY's to do the job. But, one person has explained that this would include into the design some problems that might be tricky and which he does not feel this circuit would work for nor is he sure he can modify it. This is not for stealth work as I have mics for that. It is just for powering very small cardioids which like to be driven with higher voltages, up to ~48 volts. Any help would be appreciated. I can almost read a circuit, can solder and follow instructions. I built a couple of audio amps, tuner and pre-amp many moons ago so I suppose I could get up to speed easily enough.

Thanks.

Hey Booj ,.... here is your answer http://www.core-sound.com/2Phant/1.php

[boojum]

GF - Yes, that will do the job just great, and cost me ~$300 to my door. A DIY is fun and way cheaper. I am trying to get this done on a shoestring if at all possible. Worst case scenario I will go to CORE sound. What the hell, they are home boys. But build, not buy, is the better option for me, if it can be done.

[Strungup]

GF - Yes, that will do the job just great, and cost me ~$300 to my door. A DIY is fun and way cheaper. I am trying to get this done on a shoestring if at all possible. Worst case scenario I will go to CORE sound. What the hell, they are home boys. But build, not buy, is the better option for me, if it can be done.

I was just rubbing it in a little Booj , you asked IF it could be done , wellllll someone did it ! LOL a little high yes 300 is a lot for phantom box , Audio Technica use to make one around 50 bucks , try their page

[boojum]

Yo, GF, found a DVD LiIon box to feed power to a portable DVD player. It puts out 9 or 12 volts and powers the DVD player "for three hours." Sounds like this could be spliced into GM's little circuit for a killer low voltage phantom power for the U853. I am not planning on recording at SPL's hiugher than 120 dB. LOL

The other option is a 48 - 52 volt Li Ion battery pack, rechargeable, for the same deal. I am chasing info on the high voltage pack now.

L8R

[Strungup]

Yo, GF, found a DVD LiIon box to feed power to a portable DVD player. It puts out 9 or 12 volts and powers the DVD player "for three hours." Sounds like this could be spliced into GM's little circuit for a killer low voltage phantom power for the U853. I am not planning on recording at SPL's hiugher than 120 dB. LOL

The other option is a 48 - 52 volt Li Ion battery pack, rechargeable, for the same deal. I am chasing info on the high voltage pack now.

L8R

Where was that DVD pack?

[boojum]

Where was that DVD pack?

go here: http://cellboost.com/product_pdvd.htm

I have the PDF with more detailed specs if you are interested.

Cheers

[Tycho]

Last year I build a phantom ps based on the LT1072 by Linear Technology.

48V/40mA and surprising low noise, about -75dBV. All that in 4x3x3cm.

See attachment for schematic.

Tycho

[Strungup]

go here: http://cellboost.com/product_pdvd.htm

I have the PDF with more detailed specs if you are interested.

Cheers

nice pack , klik this , you could get another one http://cellboost.com/free.htm

I found this while searching around.

The only thing you would need to do is put on pins 2&3 at the output are some blocking caps (10uF ) to keep the two voltages seperated( MD Plugin ) this would pahantom power your mics , but they would still need some gain. This one was for 18 volts, but there were a butload of others. When I looked for Battery Phantompower for mics, I got produst already made. But I was researching how I could use my AT-822 with the Microtrack 1/8 input. and came across the Voltage block idea. That led to another search , and I found ALLL kinds of DIY projects ranging from verysimple , to the insane.

do a google , on " Voltage Blocking for mic pre" just copy and paste that , the first few pages had some very good links

Edited April 12, 2007 by Guitarfxr

[boojum]

I called Sound Professiionals and talked with the mic guy there. There is a negligible gain in performance from 9 to almost 48 volts. I was also assured that 9 volts would be good for all but Megadeath and the like. So, it looks like a pair of SP-CMC-4U and Greenmachines plans will have me out there with a good set of small cardioids. Small and good sound. I am pleased. First, the power supply. The SP's are AT U853's packaged by SP.

Thanks all.