Bypassing the LM6171

Fat Dave · 14th March 2005, 09:14 PM

Just looking for some user experience on bypassing the power pins on the LM6171

I believe the CarlosFM method is 22-100uF electrolytic with 0.1uF ceramic as close as possible (which I've used happily with other opamps - thanks Carlos!). Datasheet shows a configuration with a 2.2uF tantalum with 0.01uF for the LM6171.

What has worked well for you with this chip?

Peter Daniel · 14th March 2005, 09:25 PM

4.7 BG N without any other aditional bypasses.

mikelm · 14th March 2005, 10:27 PM

1uF low inductance film like cap "ERO" MKT 1822 soldered onto the pins also works and sounds good. This arrangement and a battery works well with no further aditions needed.

best avoid using sockets - they could well cause oscillation.

I did it dead bug style.

mike

carlosfm · 14th March 2005, 11:23 PM

Quote:

Originally posted by Fat Dave
Just looking for some user experience on bypassing the power pins on the LM6171

I believe the CarlosFM method is 22-100uF electrolytic with 0.1uF ceramic as close as possible (which I've used happily with other opamps - thanks Carlos!).

That and also a 100~330nf directly across V+ and V- pins works wonders.

No problem with sockets and the LM6171 if you use the small ML ceramics right on the socket's pins to ground.
And btw no need for ultra-fancy caps to have excellent results.

Fat Dave · 15th March 2005, 04:09 PM

Thanks all! Good to know it's not hypersensitive - you just need to treat it properly.

I'll probably start with the method I know, and experiment from there.

I was going to go without socket (which I don't like to do, but wanted to avoid the extra capacitance). Maybe I'll give it a try with some good machined sockets first, keep the caps as tight as possible, and see if I can keep it out of oscillation.

And I definitely won't forget the 100-330nF from V+ to V-

14th March 2005, 09:14 PM	#1
Fat Dave diyAudio Member Join Date: Aug 2004 Location: Calgary, Canada	Bypassing the LM6171 Just looking for some user experience on bypassing the power pins on the LM6171 I believe the CarlosFM method is 22-100uF electrolytic with 0.1uF ceramic as close as possible (which I've used happily with other opamps - thanks Carlos!). Datasheet shows a configuration with a 2.2uF tantalum with 0.01uF for the LM6171. What has worked well for you with this chip?

14th March 2005, 09:25 PM	#2
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	4.7 BG N without any other aditional bypasses. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

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
Headphone Amplifier used LM6171 op-amp	franky2005	Vendor's Bazaar	1	10th March 2010 11:26 PM
Bypassing B+ in PP amp	oshifis	Tubes / Valves	6	5th May 2008 08:28 PM
Wtd : Lm6171	poynton	Swap Meet	0	6th May 2006 03:39 PM
what's the output impedance of a LM6171?	deskmate88	Digital Source	2	5th January 2003 03:38 AM
LM6171 input stage design	capslock	Solid State	17	20th March 2002 03:49 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

14th March 2005, 10:27 PM	#3
mikelm diyAudio Member Join Date: May 2003 Location: England	1uF low inductance film like cap "ERO" MKT 1822 soldered onto the pins also works and sounds good. This arrangement and a battery works well with no further aditions needed. best avoid using sockets - they could well cause oscillation. I did it dead bug style. mike

15th March 2005, 04:09 PM	#5
Fat Dave diyAudio Member Join Date: Aug 2004 Location: Calgary, Canada	Thanks all! Good to know it's not hypersensitive - you just need to treat it properly. I'll probably start with the method I know, and experiment from there. I was going to go without socket (which I don't like to do, but wanted to avoid the extra capacitance). Maybe I'll give it a try with some good machined sockets first, keep the caps as tight as possible, and see if I can keep it out of oscillation. And I definitely won't forget the 100-330nF from V+ to V-

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)