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Post by kp93300 on Mar 10, 2014 14:47:05 GMT
I bought the muse TPA 3123 board like this one www.ebay.com/itm/NEW-MUSE-M50-EX-TPA3123-T-Amp-Audio-Stereo-Amplifier-2x50W-RMS-Adaptor-Silver-/251118078676I only buy the fully stuffed pcb without casing. the build quality is adequate and paid less than US 20 with shipping to malaysia. when i first tested it on arrival the sound is rather poor with scratchy volume pot and the ground pin for the rca input broke . there is a constant hissing sound. i decided to play with the board by repairing/ replacing the broken parts . i change the input caps from cheap polar electrolytic 10 uF to film smd caps retrived from a broken harddisk. it is soldered on the underside of the pcb. the TPA application notes mentioned about low esr bypass caps near to the tpa 3123 chip. i tried ceramic disc soldered on the underside of the 1uf films caps next to the power supply electrolytic caps. I build a linear regulated power supply with LM 338 regulator adjusted to 18 V dc. all this mods transformed the amp powering the markaudio 12 p fullranger. The sound is fantastic with great dynamic swings, extended high, tube like mid and well controlled bass. multiple layers of orchestral music is discernible. It truly sounds like a hi fi --rather good one !!! this is the cheapest amp that i have used in my set up and surprised me everytime i listen to music. what a discovery !!! i try to add an attachment at 550Kb but the forum says i have exceeded the limit !!! enjoy kp93300
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jc
Fully Modded
Posts: 5,417
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Post by jc on Mar 10, 2014 17:43:50 GMT
Hi KP, Isn't it nice to get a super cheap reward like that! For pictures you need to use a third party site (e.g. photobucket, flikr, etc) to host your photographs and then use links from there, like I have done using your link as the host
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Post by PinkFloyd on Mar 10, 2014 22:03:53 GMT
Is that a genuine 3123 or a cheap chinky knock off? I am very particular when it comes to 3123's......
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Post by PinkFloyd on Mar 10, 2014 22:06:20 GMT
By the way.........
What the F (WTF) is a 3123?
Am I missing something?
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Post by PinkFloyd on Mar 10, 2014 22:07:37 GMT
Is it as good as a 3123XP_Turbo?
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Post by kp93300 on Mar 10, 2014 22:27:59 GMT
TPA 3123 is a class T amplifier chip manufactured by Texas Instruments. It is designed to work in Television audio. The chip is about the size of the postage stamp and is partially hidden between the blue caps in the picture. There is no heatsink . There is extensive discussion in the diyaudio forum on the TPA 3116 board at less than US 20 . I also owned the same board but the TPA 3123 seems more transparent in my set up.
what is 3123X Turbo??
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Will
Been here a while!
Ribena abuser!
Member since 2008
Posts: 2,164
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Post by Will on Mar 21, 2014 20:10:17 GMT
Hi kp93300, Thanks for posting about your tpa amp, it reminded me that I had a Sure TPA3110-based pcb sitting idle. I connected it up earlier this week, power from a random 19V laptop brick and music from a Sansa Clip. It was a little tizzy sound-wise initially, but settled down nicely once the caps had formed. It sounds very nice, with a surprisingly well formed sound stage. The main reason that I'm surprised is that this little 8W stereo amp cost less than £9 delivered! It's perfect for use in a desktop system, which is where I'll be using it. Connected to a Raspberry Pi/PK Dac, it'll do music/radio duties just fine. If you've got the money spare, it's worth buying, and dead simple to get running - it's more Lego than DIY! BTW, if you want more than 8W, look at an amp based on the TPA3116 or TPA3123.
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Post by johnyradio on Oct 11, 2015 17:19:37 GMT
"settled down nicely once the caps had formed." Hi, what does it mean to say the caps "formed"? thx!
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Post by PinkFloyd on Oct 11, 2015 18:30:51 GMT
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