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Old 6th April 2005, 06:02 AM   #1
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Default op541 gainclone

Does anyone know of any decent schematics for an op541 gainclone? I've got some op's that I'd like to use for something, and a quick search didn't turn up much.
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Old 6th April 2005, 05:04 PM   #2
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There have been recent posts about OPA541 and OPA549 which cover this topic. National makes an app note, I think 1142 or but it one of the posts, which will give you come connection guidelines if you want to parallel or bridge the OPA541.

There really isn't much to it. It's an op amp. Give it an input, power, close the loop, set some external components with simple Rs and Cs. Search for "OPA54*"
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Old 7th April 2005, 03:00 AM   #3
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that would be nice of national to give you app notes for a TI/BB chip
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Old 8th April 2005, 03:00 AM   #4
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I seem to be having a problem.. I'm getting straight DC on the output. I used this schematic. Is there something wrong with the schematic? I've tried it more than once on a breadboard with no luck.. Maybe something wrong with the chip, if the schematic is good?
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Old 8th April 2005, 06:44 AM   #5
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hey is it ok if i use an unregulated supply.

my transformer is 20-0-20 5amp. is it good enought?
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Old 8th April 2005, 10:32 AM   #6
boholm is offline boholm  Denmark
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Quote:
Originally posted by bigmike216
I seem to be having a problem.. I'm getting straight DC on the output. I used this schematic. Is there something wrong with the schematic? I've tried it more than once on a breadboard with no luck.. Maybe something wrong with the chip, if the schematic is good?
Try adding a resistor between pin 1 and ground - 'round 10 to 100 kohms depending on desired input resistance.


Quote:
Originally posted by sidd_raj2002
hey is it ok if i use an unregulated supply.

my transformer is 20-0-20 5amp. is it good enought?
Yes. And Yes.
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Old 8th April 2005, 05:57 PM   #7
Stabist is offline Stabist  Slovenia
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@bigmike - sounds like your input ain't connected to ground - for a start - just add a potentiometer at the input - properly wired - and if chip ain't damaged anyhow - I'm quite sure your problem will dissapear ...

Or if you intend to use a separated preamp - then just put some e.g. 50kOhm resistor between pin 1 and gnd ...
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Old 8th April 2005, 05:59 PM   #8
Stabist is offline Stabist  Slovenia
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Whoa ... Tha 0,068uF cap at the input is waaay to small ...

Try one of those combination:
- 0,47uF and 100kR resistor
or
- 10uF and 22kR resistor ...
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Old 8th April 2005, 08:57 PM   #9
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Thanks! I'll give it a go.
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Old 9th April 2005, 02:51 AM   #10
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Quote:
Originally posted by Stabist
@bigmike - sounds like your input ain't connected to ground - for a start - just add a potentiometer at the input - properly wired - and if chip ain't damaged anyhow - I'm quite sure your problem will dissapear ...

Or if you intend to use a separated preamp - then just put some e.g. 50kOhm resistor between pin 1 and gnd ...

That did it! Thanks!! As you can tell, I'm new to opamps now I know!
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