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Old 5th August 2009, 11:20 PM   #901
juluska is offline juluska  Ukraine
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another option from me (without any electronics knowledge)
Is it possible to build this in a protoboard with psu and two dual opamps per channel? They are project 1 and project 14 from ESP audio.
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Old 5th August 2009, 11:43 PM   #902
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Quote:
Originally posted by AndrewT
the DRV is reputed to not sound the best for audio.
Could someone suggest a good audio line driver?
LM4562, LME48720, THS4131 ...

http://www.shine7.com/audio/bpre.htm
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Old 6th August 2009, 09:36 AM   #903
Cobra2 is offline Cobra2  Norway
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Old 6th August 2009, 10:40 AM   #904
shmulik is offline shmulik  Israel
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juluska,

you already have the DRV at hand. I don't think you will cause any damage if you try it with the pot. if it sounds right to your ears let it be.
if you insist on building an adapter following ESP you may choose P87B further down the page since it has less parts than your proposal above and has the same ability to present a stable input impedance. to my best understanding all you have to do is to replace the input 22k resistor with a potentiometer with similar value and connect R101 to its variable tap.

I might even try that myself AFTER the SMD parts will get to P-A and he is able to send everything to me.

I hope Rhys keep the momentum he accumulated and is able to deliver another package.
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Old 6th August 2009, 11:00 AM   #905
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by juluska
another option from me (without any electronics knowledge)
Is it possible to build this in a protoboard with psu and two dual opamps per channel? They are project 1 and project 14 from ESP audio.
why attenuate and add 10times gain (+20dB) after the buffer followed by the two times gain (+6dB) in the balanced converter and then ~+26dB gain of the power amp?
That's a total gain of +52dB (~400times). This is bonkers for a conventional source with a peak output of 200mVac to 2Vac.
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Old 6th August 2009, 12:06 PM   #906
shmulik is offline shmulik  Israel
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following andrewT's comment the option I turned you to has unit gain
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Old 6th August 2009, 12:14 PM   #907
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Originally posted by peranders
Could everyone with claims send message to me please? The persons I am going to send stuff are on the wiki list. I will conducting Rhys' business forever.
I send mail
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Old 6th August 2009, 01:45 PM   #908
juluska is offline juluska  Ukraine
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Quote:
Originally posted by shmulik
juluska,

you already have the DRV at hand. I don't think you will cause any damage if you try it with the pot. if it sounds right to your ears let it be.
if you insist on building an adapter following ESP you may choose P87B further down the page since it has less parts than your proposal above and has the same ability to present a stable input impedance. to my best understanding all you have to do is to replace the input 22k resistor with a potentiometer with similar value and connect R101 to its variable tap.

I might even try that myself AFTER the SMD parts will get to P-A and he is able to send everything to me.

I hope Rhys keep the momentum he accumulated and is able to deliver another package.
Like this?

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Old 6th August 2009, 01:48 PM   #909
juluska is offline juluska  Ukraine
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What opamp would you use? Can i use opa2134 or opa2604?
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Old 6th August 2009, 02:06 PM   #910
logical is offline logical  Romania
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LME49720 is a very good choice... check the specs, you can't do better than that... and it's a little cheaper than the OPAs

but, if you want to use the ones from TI, i would go for the OPA2604...

either one of these two is an excellent opamp for audio
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