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Old 26th July 2012, 10:24 PM   #1
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Default $150-200$ Preamp Build?

Hi guys, i want to build an preamp for my PC, i already build some amps, but my new sound card have an analog optput that need to be used with an preamp.

What recommend me? mainly i want to attenuate the level output. dont want to spend more than 200USD. If is possible to build osmething cheap with good specs will be great!



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Old 26th July 2012, 11:03 PM   #2
adason is offline adason  United States
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so you want to amplify or attenuate...what is it?
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Old 27th July 2012, 04:07 AM   #3
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Quote:
Originally Posted by adason View Post
so you want to amplify or attenuate...what is it?
Thanks, my english is not good

Mainly i want to control the output (loudness), i cant control it trough the PC, because the analog output of the sound card cant be controlled trough the PC.
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Old 27th July 2012, 04:25 AM   #4
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was thinking about "stepped attenuator" thats why i type "attenuate"
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Old 27th July 2012, 10:19 AM   #5
DF96 is offline DF96  England
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Volume pot in a box, otherwise known as a 'passive preamp'. Unless your PC has a very high quality sound card, not worth spending more than $20 on it.
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Old 27th July 2012, 11:34 AM   #6
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Considering I'd prefer not to use normal pc soundcards above 0,4-0,6V output, suprisingly many tend to distort, even some of the supposed good ones. I think it is very reasonable to have some sort of buffer with volume on the analog out.

I have not tried any of these products, but from ska-audio you can get: SKpre + DualSKpreReg and a transformer and you're good to go, price seems very reasonable. Alternatively you can go for the cheaper Vbuffer solution.

Another very valid alternative would be a proper usb dac of some sort.

Edit:
What is the name of your sound card?

Last edited by KaffiMann; 27th July 2012 at 11:40 AM.
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Old 27th July 2012, 01:35 PM   #7
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hi guys, the Sound Card are high quality one. I want to purchase/build some good one.

The sound card is an Onkyo SE-200.

•Signal-noise ratio: 115dB (2ch ANALOG OUT)
•Frequency characteristic: 0.3Hz~88kHz( 2ch ANALOG OUT , +0/-3dB )
•Line output level: 2.0V rms
•Digital IN sampling frequency: 32, 44.1 and 48, 88.2, 96kHz
•Digital OUT sampling frequency :32, 44.1 and 48, 88.2, 96kHz, 176.4, 192kHz

Last edited by samsagaz; 27th July 2012 at 01:37 PM.
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