Need help with mono LM4702 Amp

benproiii · 15th May 2011, 03:33 PM

I already built an stereo LM4702 amp for my main speakers and i love the sound quality. I want to build one for my subwoofer. If i want to build just one channel can i leave the (comp,sink,source,+,- pins) for the unused channel on the lm4702 floating or do they need to be shorted to ground or something.

benproiii · 18th May 2011, 08:13 PM

anybody??

quikie22 · 19th May 2011, 12:41 AM

As this will be for subwoofer use, maybe you can consider using both channels in bridged mode for more power?

dlk666 · 8th July 2011, 08:42 AM

Hi, do you perhaps have the schematic for the amp you built, i would like to build one.

petrusevski · 17th July 2011, 01:35 PM

benproiii, id really like to see pictures and schematic from your project. Thanks

gootee · 17th July 2011, 05:52 PM

For opamps that are unity-gain stable, the standard procedure for an unused one in a dual package is to connect the output to the negative input and then ground the positive input.

But the LM4702 is apparently NOT unity-gain stable. You could probably wire the unused one with components like in Figure 1 on page 10 of the datasheet, but connect its input to ground.

15th May 2011, 03:33 PM	#1
benproiii diyAudio Member Join Date: Aug 2010	Need help with mono LM4702 Amp I already built an stereo LM4702 amp for my main speakers and i love the sound quality. I want to build one for my subwoofer. If i want to build just one channel can i leave the (comp,sink,source,+,- pins) for the unused channel on the lm4702 floating or do they need to be shorted to ground or something.

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
Need help with LM4702 Amp	benproiii	Solid State	14	26th April 2011 10:44 PM
lm4702 power amp	darkwind_j	Chip Amps	5	30th September 2009 08:39 AM
Help with amp??? LM4702+2SK1530/2SJ201	Dougie085	Solid State	13	1st December 2007 03:25 PM
My 8-channel LM4702 AMP	harvardian	Chip Amps	4	9th December 2006 07:16 PM
LM4702 - BJT recommends (non-Darlingtons) for amp	SpittinLLama	Chip Amps	0	4th August 2006 06:02 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

18th May 2011, 08:13 PM	#2
benproiii diyAudio Member Join Date: Aug 2010	anybody??

19th May 2011, 12:41 AM	#3
quikie22 diyAudio Member Join Date: Sep 2009	As this will be for subwoofer use, maybe you can consider using both channels in bridged mode for more power?

8th July 2011, 08:42 AM	#4
dlk666 diyAudio Member Join Date: Jul 2011	Hi, do you perhaps have the schematic for the amp you built, i would like to build one.

17th July 2011, 01:35 PM	#5
petrusevski diyAudio Member Join Date: May 2009 Location: Kumanovo, Macedonia	benproiii, id really like to see pictures and schematic from your project. Thanks

17th July 2011, 05:52 PM	#6
gootee diyAudio Member Join Date: Nov 2006 Location: Indiana Blog Entries: 1	For opamps that are unity-gain stable, the standard procedure for an unused one in a dual package is to connect the output to the negative input and then ground the positive input. But the LM4702 is apparently NOT unity-gain stable. You could probably wire the unused one with components like in Figure 1 on page 10 of the datasheet, but connect its input to ground.

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