INA217 subs

[pucho812]

Looking for  INA217 subs. I know of the that that makes the 1510 , and the SSM 2019 by analog devices will work. But wondering if there is a sub that would run off +/- 24VDC

 

[Bill Wilson]

Hi Pucho: To my knowledge there are no mike preamp chips that will operate on 24 volts. Why do you want to use 24vdc? If it is for greater voltage swing, that is really not necessary as the average dynamic mike will only give an output of 0.5 volts p-p or less with the gain set for 60db (gain of 1000). I know as I have been designing a small mixer using SSM2019's to operate on batteries. Checked it with my scope & talked to an applications engineer @ analog devices.

Bill W.

 

[Rochey]

Pucho,

Ina163 is lower noise, but needs a different gain resistor.

 

[joaquins]

I guess you already has that PS rails, in which case you maybe could use the old transistor trick to the PS inputs of the INA, or which you want to use, in which case two possibilities, to re regulate the PS to what you want (ugly and not magic at all) or do this, in which case you could dream a little bit more and go further:
old topic:
http://www.proaudiodesignforum.com/forum/php/viewtopic.php?f=6&t=14
new topic:
http://www.proaudiodesignforum.com/forum/php/viewtopic.php?f=6&t=598

sorry for quoting outside us but I never see this and the development of this is there and has a couple of nice things, never went through the new post by the way.

JS

 

[Bill Wilson]

Hi Pucho:  Here is the way we did it at MCI. They started out using a Harris IC that was rated +- 45 vdc; the chips did not hold up at that voltage & they rolled it back to +- 36vdc. Ultimately they went back to 5534's using this circuit topology. The rationale was to increase voltage swing so the rock & rollers would not be able to drive any circuit in the 500 series consoles into clipping & overload.

The transistors can be replaced with 2N3904 & 2N3906's. You might need to tweak the resistor values slightly to optimize it.

The circuit has a gain of approximately 4 as shown; the gain can be changed by varying the 3.9k feedback resistor. The MCI 2003 opamp is a NE5534.

 

[pucho812]

Hi Pucho: To my knowledge there are no mike preamp chips that will operate on 24 volts. Why do you want to use 24vdc? If it is for greater voltage swing, that is really not necessary as the average dynamic mike will only give an output of 0.5 volts p-p or less with the gain set for 60db (gain of 1000). I know as I have been designing a small mixer using SSM2019's to operate on batteries. Checked it with my scope & talked to an applications engineer @ analog devices.

Bill W.

well looking at +/- 24VDC actually. I should have been more clear. To be honest it doesn't need to be +/-24VDC but I have many 24VDC supplies  sitting around that and would like to make  entire channel strips with them, I could go discrete front end and do it that way but doa's are too much money. I can get things like 2604 chips for cheap. IC's  will do me in the eq sections, was thinking a preamp chip for the pre as they are easy to work with but might just have to go old skool and do some ic's.  Not sure about a compressor and not sure if I really want to do mic pre, eq, compressor. I might just do mic pre / eq... hmmmmm