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Chip Amps Amplifiers based on integrated circuits

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Old 19th February 2013, 07:07 PM   #31
mirmite is offline mirmite  Sweden
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sorry for the spamming, here is a schematic of my wiring on my xy kit, should i connect the gnd from the outlet to somwhere else except the chassi? or have i missed something
https://dl.dropbox.com/u/15996745/bajs2/well.png
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Old 19th February 2013, 11:35 PM   #32
Jsixis is offline Jsixis  United States
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I have always read that you need to run a wire from your center tap connection on the board to the chassis. That said I am still waiting on some more qualified people to speak up
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Old 7th April 2013, 05:23 PM   #33
phase is offline phase  United States
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I can't speak for the kits, as I have only purchased assembled boards, but they have been very good.
I recently tried a pair of opa627 ICs, was skeptical figuring these would be easy to re part mark for a quick profit. The parts are great, even at a cost that was a small percentage of their cost here in the US.
Never heard of the leather car interior in Tijuana eh?
Different markets have different prices.
The center tap is what you would attach to the chassis. I usually investigate the outputs (while un powered)with an ohm meter to get a better idea of the configuration. That, along with the voltage readings will give you the whole picture. When you have correctly identified the two center taps you will find that they will have a fairly low ohm reading.
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Old 7th April 2013, 11:04 PM   #34
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Quote:
Originally Posted by Jsixis View Post
I have always read that you need to run a wire from your center tap connection on the board to the chassis.
Usually the centre tap connection is the ground.

You want the ground to be of the STAR type --- all ground wiring goes to one point. For many non-audio projects a ground bus bar works - grounds are connecting to a thick [copper] wire or 'bar'. But this can result in a potential difference, causing hum.

So use a STAR ground.
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Old 9th April 2013, 09:13 PM   #35
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I just got 2 of this 300W boards similar to that of 400W mentioned in post #1:

LME49830 K1530 J201 300W Mono Power Amplfier Board | eBay

Quality upon inspection is perfect and components seem genuine and as advertised. If you have to do this on your own it will probably cost more than getting it as a finished product, the same as if you sum up the cost of any car full spare parts list will be much higher than buying it brand new. The retail price of a transistor is not the same if you get one than if you get 2 thousand units.




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Old 10th April 2013, 10:45 AM   #36
AndrewT is offline AndrewT  Scotland
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Build it.

Soak test it with a resistive dummy load.
Test it thoroughly before connecting your speakers.
Then report back.
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Old 10th April 2013, 12:35 PM   #37
Mihkus is offline Mihkus  Estonia
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Bought IRS2092 kit, had some trouble first with 5 band and 4 band mixed resistors with unreadable color code...
Then dumped them in garbage... well i used most of them but still had to use some of my own.

Driver was fake, both output trans were fake...
It did not even start up, has some hiss on the output bu nothing when signal was applied..
Supply voltage was +-65V (good enuf) ;D

Bought new drivers and two IRFB4020 for 8€ total and it works like chaarrrmmm

Now waiting for LM4766 stereo amp i saw the supply rails to the chip were prety damn long but maybe adding some solder to them will affect the sound a bit better way.
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Old 16th July 2013, 03:41 AM   #38
redjr is offline redjr  United States
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Broad-brushing the notion that all kits, or other amp modules from Asia are worthless and/or dangerous is simply irresponsible. I've ordered many such kits and have had only 1 failure. OTOH, I did purchase a Sure IRS2092 based amp from Parts Express and it lasted 2 weeks before it started to fail and ultimately died and was relegated to the dust-bin of my used, but damaged modules. So a reputable dealer is not always a reliable benchmark. And to suggest that all kits from China will blow up in your face, is simply gross hyperbole. I have found on most of my modules that the parts are genuine and build quality excellent on professionally made PCBs, and I have been very happy with most of my purchases and more importantly, the audio results of the end product.

Has anyone tried this particular assembled amp module based on the TI LME49810 chip amp? On simple visual appearance it appears of quality build. Like to hear first-hand experiences with it. Does it sound good?
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Old 28th August 2013, 10:55 PM   #39
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Quote:
Originally Posted by AndrewT View Post
Build it.

Soak test it with a resistive dummy load.
Test it thoroughly before connecting your speakers.
Then report back.
All set Andrew.
Thread here:

http://www.diyaudio.com/forums/solid...-pictures.html
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Old 28th August 2013, 10:57 PM   #40
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Quote:
Originally Posted by redjr View Post
Broad-brushing the notion that all kits, or other amp modules from Asia are worthless and/or dangerous is simply irresponsible...

... And to suggest that all kits from China will blow up in your face, is simply gross hyperbole. I have found on most of my modules that the parts are genuine and build quality excellent on professionally made PCBs, and I have been very happy with most of my purchases and more importantly, the audio results of the end product.
+1
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