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Old 3rd January 2004, 10:54 PM   #11
usekgb is offline usekgb  United States
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The DRV134 will give you better performance than the 5532 layout due to the fact that all of the resistors required to set the gain of the op-amps are internal and laser trimmed in the DRV134. So, in reality, using the DRV134 will be cheaper, use less parts, and will give better performance.

Cheers,
Zach
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Old 4th January 2004, 09:41 AM   #12
moamps is offline moamps  Croatia
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Hi,

Quote:
Originally posted by usekgb
The DRV134 will give you better performance than the 5532
Yes, but this isn't here on first place of priority. Daniel needs moderate quality preamp with 20dB gain; the DRV134 hasn't gain.(I use AD SSM 2142 for high quality applications).

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Old 4th January 2004, 10:04 AM   #13
dhaen is offline dhaen  Europe
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Actually, you can get gain out of a DRV134 by inserting resistors in pins 2 & 7, but as I intimated earlier, it will start to degradr the performance.

Moamps solution is elegant.

I believe you need "golden ears" to tell the DRV134 and SSM2142 apart. To me they're functionally equivalent.
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Old 4th January 2004, 10:09 AM   #14
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Moamps,
Have you considered arranging the opamps in parallel rather than in series in order to achieve a more accurately balanced output?
In your diagram you would disconnect R5 from the o/p if IC1A and connect it to pin 3 of IC1A, then remove R1 completely.
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Old 4th January 2004, 11:11 AM   #15
moamps is offline moamps  Croatia
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Quote:
Originally posted by traderbam
In your diagram you would disconnect R5 from the o/p if IC1A and connect it to pin 3 of IC1A, then remove R1 completely.
Hi,

this is another possibility, but you must change resistors values to get the same gain in two topologies (noninverting and inverting opamps). Those values are then outside the E24 range, etc..

regards
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Old 4th January 2004, 12:14 PM   #16
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Hi all,

I was looking for something like Moamps' circuit to up the sub out level of my av receiver into a behringer ultracurve pro. (then onto pro amps)

I have opa 2134's lying about here, and a power supply already built. Can I use these instead of the 5532 ? - I read elsewhere on the forum that the 5532 will handle a higher voltage.

Cheers

Rob
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Old 4th January 2004, 02:28 PM   #17
dhaen is offline dhaen  Europe
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Rob,

The 2134 is a different animal. But practically any opamp will work. It depends on how good you want it to be. If you want the best, then go for the dedicated chip DRV134.
Oh, the datasheet say the 2143'll take + - 18v.
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Old 4th January 2004, 02:33 PM   #18
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Hi John,

Would the DRV134 drop straight into the above circuit or do I need a new one? - You know that electronics ain't my forte

Cheers

rob
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Old 4th January 2004, 03:21 PM   #19
dhaen is offline dhaen  Europe
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Default Bak sheesh

No Rob.

Drop me an email with your address, and I'll pop a 5532 in the post.
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Old 4th January 2004, 03:33 PM   #20
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Cheers John but...,

I've added a couple of them to an order I've just placed. How different would a 'proper' circuit be in complexity ? I've got a few transformers lying around and am looking for a UK supplier of the DRV134 right now. Can probably adapt the power supply I've got at the mo : http://sound.westhost.com/project05.htm

I'll do a search for the DRV cicuits and see what I find.


EDIT: found this : http://www.jensen-transformers.com/as/as022.pdf

Has an option without transformers...(not drv134 though)

Cheers

Rob
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