Wireless Class A preamp

[alexidoia]

Hello,
I am sure I have seen such project somewhere but I can't find it anymore.
I would like to build a 4 channel mic preamp that has this specification :
- portable ! (with battery)
- 48v phantom power
- highest gain possible
- low noise class A spec

This would be suitable for audio video capture and would compete with mic pre like Sound Device.
Thanks
alex

 

[Rochey]

You might want to check out theExpat Audio Eden Preamps...

It's ideal for portable pre's, and will run off a pair of pp3's comfortably.

Phantom is a bit more of a challenge, but nothing a stack of batteries can't solve.

 

[zebra50]

The Expat Edens are excellent! Highly recommended, very clean and quiet, and very easy to put together.

I have done phantom from 5 x 9v = 45v..... Close enough!

Stewart

 

[alexidoia]

This is actually what I initialy though. Looks compact enough. But how much power do they need ?
Do you know of any good quality compact limiter that could be coupled to these ?
My plan is to make a four channel portable device with limiter, A/D converter and direct to disk record.

Alex

 

[Rochey]

I have the calculations on a PC thats in storage (moving house) however, if memory serves, current consumption is low. Your essentially looking after 7 opamps per channel. (Granted high performance)

If you despised the Voltage rail led's you can drop 20mA per channel immediately!

For your reference, devices used are ina163, drv135 and opa134.

I can get current consumption for each soon.

Cheers

/R