My OPA549 Schematic... Does it look ok? - diyAudio
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Old 2nd May 2005, 09:56 PM   #1
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Default My OPA549 Schematic... Does it look ok?

This is all made with parts I have on hand.. 1% metal film resistors and such


Gain is fairly low, as it's an opa549.. I'll add a preamp if my schematic here looks like it'll work.
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Old 2nd May 2005, 10:21 PM   #2
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Here I have not checked all the pin layout

Add a .1uf cap to each supply rail

Pins 5 &7 are V- supply both pin must be connected

Pins 10 & 11 are V+ supply both pin must be connected

Try a snubber
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Old 2nd May 2005, 10:26 PM   #3
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that's the only change that needs to be made? I'll go pick up some 1k metal films then
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Old 2nd May 2005, 10:36 PM   #4
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I m sorry read second post
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Old 2nd May 2005, 10:42 PM   #5
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Cool Suggestion

OPA549:
Gain of 7.6x.
1uf film input coupling cap, with 47k to ground.

Preamp:
2xOPA637, with a gain of ~7x, PSU voltage +/-18V.
Biased to class-a with a 2k resistor between V- and output.
No input or output coupling caps on the pre.
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Old 2nd May 2005, 10:44 PM   #6
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PS: Snubberized PSU.
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Old 2nd May 2005, 10:51 PM   #7
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whoops, I forgot a ground symbol in there I think i'd like to go with a gain of around 10, will it still be stable around 10?
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Old 2nd May 2005, 10:53 PM   #8
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schematic:
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Old 2nd May 2005, 11:04 PM   #9
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That's a gain of 11.
I would go a little lower.
Change R3 for 1.2k.
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Old 2nd May 2005, 11:05 PM   #10
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Quote:
Originally posted by bigmike216
whoops, I forgot a ground symbol in there I think i'd like to go with a gain of around 10, will it still be stable around 10?
The OPA541/8/9 chips are stable with gains of 1.
The gain of 7.6x I recommended is fine.
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