cheap eBay chip amp modules!

Juicie · 29th September 2008, 02:35 PM

I found those on ebay. Any information about the used chips? Can't find anything.

They are cheap and ebay feedback is positive.

~ Super Mini 115 Watt PMPO 13.5W RMS Stereo Amplifier *

~ 200 Watt PMPO 19 W RMS DIY HiFi Stereo Amplifier *

~ 180 Watt PMPO 30 Watt RMS DIY HiFi Stereo Amplifier *

00940 · 29th September 2008, 03:22 PM

http://www.datasheetcatalog.org/data...f_e/LA4625.pdf

Nothing great in there. But they could be interesting for cheap computer speakers or the like.

danielwritesbac · 22nd October 2008, 02:25 AM

These appear quite good for studying buffers and tone controls.
One of these has a junk op amp onboard (replacement is easy), and the other has a transistor buffer (maybe). I think they're excellent for study and play. There's also a bridged transistor amp with a VCA chip pre (maybe). This larger model appears to have the same VCA chip as one of my preamp kits, so I'm curious if theirs hums or not.
I bought a 13.5w, a 30w, and an 80w to play with, because of their interesting pre-drive stages. For me, its easiest to study when there's a real live example on my desk, and it is more interesting to see it all applied.
Thank you!!

AndriyOL · 24th October 2008, 10:45 PM

There are much more powerful devices
http://shop.ebay.com/items/_W0QQ_nkw...romZR40QQ_mdoZ

http://cgi.ebay.com/LM4780-Dual-Audi...QQcmdZViewItem

http://cgi.ebay.com/Stereo-Audio-Pow...QQcmdZViewItem

danielwritesbac · 25th October 2008, 01:13 AM

More powerful than the Bonzai B12 Bomber? http://cgi.ebay.com/800-Watt-Banzai-...QQcmdZViewItem
lol!

Well, probably. But that wasn't the point.

I already have powerful hifi amps aplenty. The real point of my purchase of the little modules is to study their pre-drive (preamp/buffer/predrive) construction, their tone controls, and really just explore.

MJL21193 · 25th October 2008, 03:30 AM

Quote:

Originally posted by Juicie
I found those on ebay. Any information about the used chips? Can't find anything.

They are cheap and ebay feedback is positive.

These are garbage. If these were free, they still wouldn't be worth the cost of shipping.
Save your money.

danielwritesbac · 25th October 2008, 03:40 AM

Yeah, I didn't buy them to use them for audio amplifiers.

I bought them for exploration (play). If the two advertised as digital are actually class D, I'll probably see some smoke (I have "personal issues" with class D). However, I'll let you know if any of these are actually useful (If they don't blow up, if the don't have HF that could damage ears, and if they actually work well). Its not important for my use if these work or not.

MJL21193 · 25th October 2008, 03:48 AM

Quote:

Originally posted by danielwritesbac
However, I'll let you know if any of these are actually useful

Hi Dan,
Ruby, on my psychic hotline looked into her crystal ball for me...the spirits say "stay awayyyy"

29th September 2008, 02:35 PM	#1
Juicie diyAudio Member Join Date: Sep 2008	cheap eBay chip amp modules! I found those on ebay. Any information about the used chips? Can't find anything. They are cheap and ebay feedback is positive. ~ Super Mini 115 Watt PMPO 13.5W RMS Stereo Amplifier * ~ 200 Watt PMPO 19 W RMS DIY HiFi Stereo Amplifier * ~ 180 Watt PMPO 30 Watt RMS DIY HiFi Stereo Amplifier *

29th September 2008, 03:22 PM	#2
00940 diyAudio Member Join Date: Sep 2003 Location: Paris	http://www.datasheetcatalog.org/data...f_e/LA4625.pdf Nothing great in there. But they could be interesting for cheap computer speakers or the like. __________________ Ben.

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22nd October 2008, 02:25 AM	#3
danielwritesbac diyAudio Member Join Date: Nov 2007	These appear quite good for studying buffers and tone controls. One of these has a junk op amp onboard (replacement is easy), and the other has a transistor buffer (maybe). I think they're excellent for study and play. There's also a bridged transistor amp with a VCA chip pre (maybe). This larger model appears to have the same VCA chip as one of my preamp kits, so I'm curious if theirs hums or not. I bought a 13.5w, a 30w, and an 80w to play with, because of their interesting pre-drive stages. For me, its easiest to study when there's a real live example on my desk, and it is more interesting to see it all applied. Thank you!!

24th October 2008, 10:45 PM	#4
AndriyOL diyAudio Member Join Date: Jul 2008 Location: Lviv	There are much more powerful devices http://shop.ebay.com/items/_W0QQ_nkw...romZR40QQ_mdoZ http://cgi.ebay.com/LM4780-Dual-Audi...QQcmdZViewItem http://cgi.ebay.com/Stereo-Audio-Pow...QQcmdZViewItem

25th October 2008, 01:13 AM	#5
danielwritesbac diyAudio Member Join Date: Nov 2007	More powerful than the Bonzai B12 Bomber? http://cgi.ebay.com/800-Watt-Banzai-...QQcmdZViewItem lol! Well, probably. But that wasn't the point. I already have powerful hifi amps aplenty. The real point of my purchase of the little modules is to study their pre-drive (preamp/buffer/predrive) construction, their tone controls, and really just explore.

25th October 2008, 03:40 AM	#7
danielwritesbac diyAudio Member Join Date: Nov 2007	Yeah, I didn't buy them to use them for audio amplifiers. I bought them for exploration (play). If the two advertised as digital are actually class D, I'll probably see some smoke (I have "personal issues" with class D). However, I'll let you know if any of these are actually useful (If they don't blow up, if the don't have HF that could damage ears, and if they actually work well). Its not important for my use if these work or not.

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