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Old 20th July 2007, 05:45 AM   #1
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Default 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!


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Old 21st July 2007, 05:04 PM   #2
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Default 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.
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Old 21st July 2007, 07:56 PM   #3
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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
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Old 21st July 2007, 08:00 PM   #4
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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

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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