Question on Ne5532 + 3886 amp on Ebay

JackM11 · 29th December 2008, 04:50 AM

Hi,
I bought one like this for $30 to play with:
http://cgi.ebay.com/ws/eBayISAPI.dll...m=190276589462

I use it with my old Rotel preamp and it sounded quite clean and detailed. However, there were high freq hiss when I listened close to the tweeter. Also the gain of this amp is a bit too high as I needed to set the preamp volume quite low.

Can anyone explain the reason for the NE5532? Or I should better bypass it and just use the 3886?
I attached the schematic from the seller. It shows a LM833, not the NE5532 so I guess the schematic is not current but close enough.

Thanks in advance for any suggestions.

peranders · 29th December 2008, 06:47 AM

The LM3886 has actually noise and if you put your ear very near the tweeeter any power amp have noise!

NE5532 => much hifi for the money

The opamp may be used as buffer and as DC servo.

One thing you should be aware of is the non-optimal ground in the star ground. It seems that the smoothing caps will have an influence on the signal ground.

It's worth noticing that Italy is a not prefered country. I have never experienced that it takes a long time for goods to arrive Italy.

sangram · 2nd January 2009, 05:02 AM

NE5532 is noisy, not much way around it, except a volume pot between it and the 3886. I use one right now after an AlienDAC to bring up signal level to a respectable number, but soon to be replaced with better chips (LM4562) and circuitry. As it is it's unusable due to the noise unless the pot is turned down halfway.

Juergen Knoop · 2nd January 2009, 10:02 AM

either a faulty IC or there is something wrong with your circuit/implementation.
regards

peranders · 2nd January 2009, 11:42 AM

Quote:

Originally posted by sangram
NE5532 is noisy....

NE5532 is one of the more silent opamp if you don't have signal sources with Mohms as output impedance.

becki200 · 6th January 2009, 06:58 PM

I guess they use the opamp as a preamp. have you tried it without your preamp?

JackM11 · 6th January 2009, 07:09 PM

Hi becki200,
thanks for your suggestion. Also thanks everyone who gave me a suggestion.
I used a preamp because I don't have a proper volume control for the kit. With a preamp the gain is a bit too high and perhaps this is one reason why I can hear more noise.
Anyway, this small $30 investment allows me to find out a chip amp potential and I am glad I did it. By the way, I have a small heatsink on the chips and they run quite hot but no problem thought, which is good. At least the amp works.
Jack

mjf · 6th January 2009, 07:49 PM

hello.
cannot find a schematic.
little upgrade possible: ne 5532ap(tex.instr.) or ne 5532an(philips).
greetings................

becki200 · 6th January 2009, 07:57 PM

Hi Jack, buy a cheap pot (for example 2 x 100 kOhms) and connect a CD Player or any outher source directly to the amp. If you dont know how to connect it i could draw aschematic for you

JackM11 · 6th January 2009, 08:51 PM

The schematic file size was bigger than the 100k limit before. I reduced the size and try again.
Thanks

29th December 2008, 04:50 AM	#1
JackM11 diyAudio Member Join Date: Sep 2007	Question on Ne5532 + 3886 amp on Ebay Hi, I bought one like this for $30 to play with: http://cgi.ebay.com/ws/eBayISAPI.dll...m=190276589462 I use it with my old Rotel preamp and it sounded quite clean and detailed. However, there were high freq hiss when I listened close to the tweeter. Also the gain of this amp is a bit too high as I needed to set the preamp volume quite low. Can anyone explain the reason for the NE5532? Or I should better bypass it and just use the 3886? I attached the schematic from the seller. It shows a LM833, not the NE5532 so I guess the schematic is not current but close enough. Thanks in advance for any suggestions.

29th December 2008, 06:47 AM	#2
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	The LM3886 has actually noise and if you put your ear very near the tweeeter any power amp have noise! NE5532 => much hifi for the money The opamp may be used as buffer and as DC servo. One thing you should be aware of is the non-optimal ground in the star ground. It seems that the smoothing caps will have an influence on the signal ground. It's worth noticing that Italy is a not prefered country. I have never experienced that it takes a long time for goods to arrive Italy. __________________ /Per-Anders (my first name) or P-A as my friends call me

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
"Yuanjing" Gainclone 3886 - eBay amazing value ?	gainphile	Chip Amps	520	18th April 2012 12:07 PM
Newbie parellel 3886 speaker impedence question	2004ex	Chip Amps	5	16th April 2007 07:26 PM
Buffered amplifier question ! (2134, 3886)	-_nando-_	Chip Amps	3	24th June 2006 09:58 PM
3886 Transformer wiring stupid question	thermonuclear	Chip Amps	2	16th September 2005 05:38 PM
Brain GT 3886 PS question	lgreen	Chip Amps	10	5th April 2005 08:06 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

2nd January 2009, 05:02 AM	#3
sangram diyAudio Member Join Date: Sep 2002 Location: India	NE5532 is noisy, not much way around it, except a volume pot between it and the 3886. I use one right now after an AlienDAC to bring up signal level to a respectable number, but soon to be replaced with better chips (LM4562) and circuitry. As it is it's unusable due to the noise unless the pot is turned down halfway.

2nd January 2009, 10:02 AM	#4
Juergen Knoop diyAudio Member Join Date: Jan 2007 Blog Entries: 3	either a faulty IC or there is something wrong with your circuit/implementation. regards

6th January 2009, 06:58 PM	#6
becki200 diyAudio Member Join Date: Dec 2008	I guess they use the opamp as a preamp. have you tried it without your preamp?

6th January 2009, 07:09 PM	#7
JackM11 diyAudio Member Join Date: Sep 2007	Hi becki200, thanks for your suggestion. Also thanks everyone who gave me a suggestion. I used a preamp because I don't have a proper volume control for the kit. With a preamp the gain is a bit too high and perhaps this is one reason why I can hear more noise. Anyway, this small $30 investment allows me to find out a chip amp potential and I am glad I did it. By the way, I have a small heatsink on the chips and they run quite hot but no problem thought, which is good. At least the amp works. Jack

6th January 2009, 07:49 PM	#8
mjf diyAudio Member Join Date: Jan 2009 Location: upper austria/near linz	hello. cannot find a schematic. little upgrade possible: ne 5532ap(tex.instr.) or ne 5532an(philips). greetings................

6th January 2009, 07:57 PM	#9
becki200 diyAudio Member Join Date: Dec 2008	Hi Jack, buy a cheap pot (for example 2 x 100 kOhms) and connect a CD Player or any outher source directly to the amp. If you dont know how to connect it i could draw aschematic for you

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