Is the LM4702 Chip amp still worth using?

Tajmahallbal · 19th January 2012, 03:52 PM

Hi Guys. Ive been reading some threads this week and found some of the articals very usefull. I am an audio fanatic and like to take on DIY amplifier projects. Ive only build 2 amp of my own design, but now I would like to try out some chip amps. The LM4702 does look like a very nice option. I tried to get the PCB design onto vera board, but this is proving almost impossible since the star ground seems very important. Ive mainly followed the 1490 application note by national.This is what I have so far:

Power supply: 35 0 35 500 VA toroidal giving me appr. 47V rails
with 30 000 uF filter caps on each rail.

I have the MJ11032 & MJ11033 darlingtons for output stages.
Can you use a series cap on the output stage? (disadvantages?)
Is this a good combo?
And can anyone help me with a good PCB design. Anyone got Gerber files?

Sorry for all the questions but it seems that there is so much to learn..

AndrewT · 19th January 2012, 04:14 PM

Search this Forum for threads discussing 4702 and it's newer brothers

Tajmahallbal · 19th January 2012, 04:16 PM

Thanks alot.

madtecchy · 21st January 2012, 10:57 AM

i got a gerber file . it took me 4 months to design. Before that i searched and read on forums for many months . however all the HARD WORK paid off it sounds fantastic.

Regards Ian

madtecchy · 21st January 2012, 10:58 AM

I was going to post the gerber but the files are corrupt sorry to all intrested

Shaun · 01:12 PM

Quote:

Originally Posted by madtecchy

I was going to post the gerber but the files are corrupt sorry to all intrested

Perhaps a pic or link to your project will suffice.

Tajmahallbal · 21st January 2012, 03:17 PM

Thanks Madtecchy. I got myself design spark and I am going through the totorials. Must say it is a nice program. Ive heard many nice things about the LM4702. Does it realy sound that good?

Hi shaun,

Where do you normally get your components from in SA? Must say it was difficult getting the LM4702 and the MJ11032&3.

19th January 2012, 03:52 PM	#1
Tajmahallbal diyAudio Member Join Date: Jan 2012 Location: Cape town South africa	Is the LM4702 Chip amp still worth using? Hi Guys. Ive been reading some threads this week and found some of the articals very usefull. I am an audio fanatic and like to take on DIY amplifier projects. Ive only build 2 amp of my own design, but now I would like to try out some chip amps. The LM4702 does look like a very nice option. I tried to get the PCB design onto vera board, but this is proving almost impossible since the star ground seems very important. Ive mainly followed the 1490 application note by national.This is what I have so far: Power supply: 35 0 35 500 VA toroidal giving me appr. 47V rails with 30 000 uF filter caps on each rail. I have the MJ11032 & MJ11033 darlingtons for output stages. Can you use a series cap on the output stage? (disadvantages?) Is this a good combo? And can anyone help me with a good PCB design. Anyone got Gerber files? Sorry for all the questions but it seems that there is so much to learn..

19th January 2012, 04:14 PM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Search this Forum for threads discussing 4702 and it's newer brothers __________________ regards Andrew T.

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 mono LM4702 Amp	benproiii	Chip Amps	5	17th July 2011 05:52 PM
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

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

19th January 2012, 04:16 PM	#3
Tajmahallbal diyAudio Member Join Date: Jan 2012 Location: Cape town South africa	Thanks alot.

21st January 2012, 10:57 AM	#4
madtecchy diyAudio Member Join Date: Dec 2010 Location: wigan	i got a gerber file . it took me 4 months to design. Before that i searched and read on forums for many months . however all the HARD WORK paid off it sounds fantastic. Regards Ian

21st January 2012, 10:58 AM	#5
madtecchy diyAudio Member Join Date: Dec 2010 Location: wigan	I was going to post the gerber but the files are corrupt sorry to all intrested

21st January 2012, 03:17 PM	#7
Tajmahallbal diyAudio Member Join Date: Jan 2012 Location: Cape town South africa	Thanks Madtecchy. I got myself design spark and I am going through the totorials. Must say it is a nice program. Ive heard many nice things about the LM4702. Does it realy sound that good? Hi shaun, Where do you normally get your components from in SA? Must say it was difficult getting the LM4702 and the MJ11032&3.

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