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Old 22nd February 2007, 01:15 AM   #1
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Default Simple pre-amp schematic needed

I am kind of a newbie when it comes to DIY audio. While I have built quite a few kits, I never really took the time to learn how or why these kits worked. I have a basic understanding of electronics and I can read a simple schematic. But I have decided to to learn as much as possible about how these things work and im taking a course in electronics as an elective at college right now. This has gotten me very interested in the basics and i recently built the Cmoy headphone amplifier and have been experimenting with different types of power supplies and opamps which has been a learning experience to say the least. So anyways, the Cmoy got me thinking about a very very simple pre-amp design I saw a while back, it was a minimalist design using only a dual opamp, a pot a few resistors and caps and a regulated +-12v power supply. I cant seem to find the schematic on my PC, I thought I saved it, but it must have gotten lost or erased. SO if anyone has the schematic im looking for or knows of a similar simple pre-amp circuit using opamps please let me know.
Thanks
Frank
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Old 22nd February 2007, 01:33 AM   #2
tinitus is offline tinitus  Europe
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maybe something - preamps at the bottom

http://www.tnt-audio.com/clinica/solidstate.html

and not to forget

http://sound.westhost.com/projects-2.htm
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Old 22nd February 2007, 03:56 AM   #3
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hello there
i am newbie too
at the college we built a simple amplifier
using opamp see attachment
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Old 22nd February 2007, 07:53 AM   #4
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Quote:
Originally posted by jackb
hello there
i am newbie too
at the college we built a simple amplifier
using opamp see attachment

Hi
if you want to go this way, go this (Evolve Power Amplifiers):
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File Type: gif k1056j160tlbamp.gif (17.7 KB, 542 views)
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Old 22nd February 2007, 07:56 AM   #5
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d1 and d2:
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Old 22nd February 2007, 08:19 AM   #6
Nordic is offline Nordic  South Africa
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Pedja Rogic's J-fet buffer for dummies.
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Old 22nd February 2007, 08:26 AM   #7
lineup is offline lineup  Sweden
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Quote:
Originally posted by padamiecki

Hi
if you want to go this way, go this (Evolve Power Amplifiers):
The only drawback, with that Evolve Amp
is that it is Inverting the Signal

But shouldn't be hard to make it ..... NON Inverting!

I like that schematic, padamiecki
Very much ...
Because it is a different idea .. it it has got POTENTIAL for something really nice


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lineup
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Old 22nd February 2007, 08:35 AM   #8
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Quote:
Originally posted by lineup

I like that schematic, Very much ...
Because it is a different idea .. it it has got POTENTIAL for something really nice


Regards
lineup

... try to simulate it, you will be smashed!
without gnfb you will get very good results (simulate only transistor buffer, without tl071)!
Its quality mych depends on preamp used,
maybe Aikido from JBroskie will be good solution (instead of this opamp)?
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Old 22nd February 2007, 03:00 PM   #9
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Thaks guys these all look ineresting. I havent found the origional design I was looking for. But I found a design using an opa132 + buf634 and I think Im going to try this one out next. Thanks for your help and ideass.
Frank
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Old 22nd February 2007, 03:04 PM   #10
lineup is offline lineup  Sweden
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Quote:
Originally posted by imperfectcircle
Thaks guys these all look ineresting. I havent found the origional design I was looking for. But I found a design using an opa132 + buf634 and I think Im going to try this one out next. Thanks for your help and ideass.
Frank
Imperfect-O.
So what was The Original you were looking for?

Why not tell us all

Thanks
lineup
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