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Chip Amps Amplifiers based on integrated circuits |
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#1 |
diyAudio Member
Join Date: Aug 2008
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Hi,
I am trying to design subwoofer pre-amp. I don't have a lot of experience (read: no experience ![]() The requirements for this project are: - stereo balanced line ins - unbalanced line out - high quality (quality over cost) - variable cut-off frequency (~150 ... ~350Hz) - VU-meters for both input signals and the output signal Things I'd like know: - are there any (big) mistakes in the design ? - are there resistors / caps / etc. missing ? - is the combination of opamps possible ? - does anyone have tips on the designing the pcb ? for example should I use SMT ? Thank you in advance. |
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#2 |
Account disabled at member's request
Join Date: Mar 2007
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I think there is something wrong with your zip file, I can see anything when I unpack and open it.
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#3 |
diyAudio Member
Join Date: Jan 2004
Location: Toronto, ON, Canada
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I am able to open the PDF file inside.
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#4 |
diyAudio Member
Join Date: Aug 2008
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mmm strange... here it is again!
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#5 |
R.I.P.
Join Date: Jul 2004
Location: Scottish Borders
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go to doug Self's site and to ESP's site and read up on balanced signals and balanced inputs.
Then read the expert, Walt Jung. Your schematic has unbalanced impedances, 10k & 20k on the hot and cold inputs.
__________________
regards Andrew T. |
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#6 |
diyAudio Member
Join Date: Aug 2008
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@AndrewT, thanks you for your response. The 'hints' you gave were very useful.
I updated the schematic so that the impedances on hot and cold pins are the same. Do you, or anyone else, have additional comments on this circuit ? Regards, Niels Bergsma |
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#7 | |
R.I.P.
Join Date: Jul 2004
Location: Scottish Borders
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Quote:
__________________
regards Andrew T. |
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#8 |
diyAudio Member
Join Date: Aug 2008
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I added two op-amps (one for Audio IN L, one for Audio IN R). They are located on the left side of the schematic, horizontal mirrored (next time I'll resolve the component numbering)
I used the circuit from Doug self's site, figure 12 ( 'Superbal'-configuration) |
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