I would like to add a gain stage to my "music centre" before the T-amp module.
See: http://www.diyaudio.com/forums/showthread.php?s=&threadid=115583
I have found a likely candidate but it requires a +18v . 0 . -18v supply.
There is not sufficient space avaialble for a dedicated power supply. Is it posible to convert an existing 18v or 24v supply form an smps to +/-?
See: http://www.diyaudio.com/forums/showthread.php?s=&threadid=115583
I have found a likely candidate but it requires a +18v . 0 . -18v supply.
There is not sufficient space avaialble for a dedicated power supply. Is it posible to convert an existing 18v or 24v supply form an smps to +/-?
use a rail-splitter -- this can be an opamp or a dedicated TO-92 device like the TLE2426 -- 24VDC will get you +/- 12VDC which is satisfactory for most opamps.
you can make a single ended preamp with JFET's like the 2SK170 and 24VDC will work just fine.
you can make a single ended preamp with JFET's like the 2SK170 and 24VDC will work just fine.
Thank you for your suggestions.
jackinnj: I will look into this. Could you provide a link to a design?
zlast: your suggestion was looking spot on until "This circuit will not work with external DC power supplies - it must use AC."
I don't particulary want external supplies (I want to keep one on/off switch).
jackinnj: I will look into this. Could you provide a link to a design?
zlast: your suggestion was looking spot on until "This circuit will not work with external DC power supplies - it must use AC."
I don't particulary want external supplies (I want to keep one on/off switch).
it's on the Texas Instruments website TLE2426 --
you can also do something like this, but you need an opamp that can source some meaningful current (like an OPA544) -- so it will be a bit more expensive than the TLE2426:
you can also do something like this, but you need an opamp that can source some meaningful current (like an OPA544) -- so it will be a bit more expensive than the TLE2426:
An externally hosted image should be here but it was not working when we last tested it.
Thanks again
I have found some useful info here: http://tangentsoft.net/elec/vgrounds.html
It looks like there is some homework to do this weekend.
I have found some useful info here: http://tangentsoft.net/elec/vgrounds.html
It looks like there is some homework to do this weekend.
Here's a simple JFET preamplifier -- distortion will be a bit under 1%
An externally hosted image should be here but it was not working when we last tested it.
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