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-   -   Bass Preamp (http://www.diyaudio.com/forums/solid-state/105558-bass-preamp.html)

superseadragon 20th July 2007 05:45 AM

Bass Preamp
 
Hey all,
I have taken a couple schematics and smashed them together here. I need some feedback and advice about the possibility of this working. The two things I combined were the preamp here and the EQ here. The schematic for this is attached to this post. I am probably going to leave out the bass cut section and the ultra low section. This is going to be a bass preamp and including that would be retarded IMO. Please commment and help me out!


http://a456.ac-images.myspacecdn.com...c9bcd76fcf.jpg

superseadragon 21st July 2007 05:04 PM

transformer for this cct
 
anyone know a fast way to estimate the power needs of this cct? I need to get a transformer to build a power cct for it but i am not sure what size i need.

drummer_Dave 21st July 2007 07:56 PM

by looking at the TL074 datasheet

http://pdf1.alldatasheet.com/datashe...ICS/TL074.html

Ios (output shorted current) is 60mA max per chip. so you would have 2 of those chips 60 x 2 = 120mA plus the preamp which shouldn't draw more then 100mA.

i would suggest a 500mA transformer which should be on the high side for sure, and should be cheap, $10-$15 on digikey.com

Nigel Goodwin 21st July 2007 08:00 PM

Quote:

Originally posted by drummer_Dave

i would suggest a 500mA transformer which should be on the high side for sure, and should be cheap, $10-$15 on digikey.com

Yes, well on the high side, it probably won't take more than 50mA?, but a 500mA TX is probably as low as you can find easily :D

I would suggest initially trying it on batteries, and measuring the current it takes (from each rail), you may well be surprised how low it is.


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