op541 gainclone

bigmike216 · 6th April 2005, 06:02 AM

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.

Evan Shultz · 6th April 2005, 05:04 PM

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*"

neutron7 · 7th April 2005, 03:00 AM

that would be nice of national to give you app notes for a TI/BB chip

bigmike216 · 8th April 2005, 03:00 AM

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?

sidd_raj2002 · 8th April 2005, 06:44 AM

hey is it ok if i use an unregulated supply.

my transformer is 20-0-20 5amp. is it good enought?

boholm · 8th April 2005, 10:32 AM

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.

Stabist · 8th April 2005, 05:57 PM

@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 ...

Stabist · 8th April 2005, 05:59 PM

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 ...

bigmike216 · 8th April 2005, 08:57 PM

Thanks! I'll give it a go.

bigmike216 · 9th April 2005, 02:51 AM

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!

6th April 2005, 06:02 AM	#1
bigmike216 diyAudio Member Join Date: Jul 2004 Location: BC, Canada	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.

8th April 2005, 06:44 AM	#5
sidd_raj2002 diyAudio Member Join Date: Nov 2004 Location: india	hey is it ok if i use an unregulated supply. my transformer is 20-0-20 5amp. is it good enought? __________________ Sidd+5.1=madness

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Freebird + Gainclone = "integrated" gainclone?	bikehorn	Chip Amps	9	5th January 2006 03:07 PM
Big gainclone	steven344	Chip Amps	10	23rd November 2005 07:58 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

6th April 2005, 05:04 PM	#2
Evan Shultz diyAudio Member Join Date: Jun 2004 Location: California, USA	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*"

7th April 2005, 03:00 AM	#3
neutron7 diyAudio Member Join Date: Dec 2003 Location: Toronto Canada	that would be nice of national to give you app notes for a TI/BB chip

8th April 2005, 05:57 PM	#7
Stabist diyAudio Member Join Date: Sep 2002 Location: Slovenia	@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 ...

8th April 2005, 05:59 PM	#8
Stabist diyAudio Member Join Date: Sep 2002 Location: Slovenia	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 ...

8th April 2005, 08:57 PM	#9
bigmike216 diyAudio Member Join Date: Jul 2004 Location: BC, Canada	Thanks! I'll give it a go.