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Class D Switching Power Amplifiers and Power D/A conversion

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Old 26th October 2013, 02:55 AM   #2211
jk44 is offline jk44  Canada
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Join Date: Oct 2013
Quote:
Originally Posted by von Ah View Post
If I recall correctly, the TP22 is lower powererd, with just one output chip. Also, it is limited to a 24VDC supply. The Hifimediy amps have two output chips, and can operate on up to 32VDC, right?
Heh, I have one of each and have not directly compared them. Sorry.
I think I like the T2 more because I put it together. I do enjoy both of them daily and have no complaints.
Oh no doubt assembling one yourself is greatly satisfying! thanks tons for the reply!

I guess I should describe my setup. I'm not looking necessarily to listen at high volumes; My speakers are PSB Alpha B1 Bookshelfs (91db/ 6 ohms) in a near field arrangement. Sitting at my computer table is all I use them for, maybe a bit of ambience when company is over.

I'm currently using an aune x2 (TPA3121D2 based model), plenty of power, just not sure what the next step up would be... looking for better sound, not strictly more power
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Old 28th October 2013, 03:53 PM   #2212
bocosb is offline bocosb  Romania
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Join Date: Jan 2013
Location: Cluj Napoca
I have a Hifimediy T1 ALPS vol pot TK2050 STA510 powered by a Mean Well 36V dialed down to 29V measured on outputs. DC offset measured and set to 0.
How hot should the heatsink run? I can keep my finger on the heatsink for about 4-5 sec, is it ok? 29V it's the lowest i can go with this source
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Old 29th October 2013, 02:00 AM   #2213
Bare is offline Bare  Canada
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Join Date: Dec 2001
Location: vancouver
Quote:
Originally Posted by jk44 View Post
Oh no doubt assembling one yourself is greatly satisfying! thanks tons for the reply!

I guess I should describe my setup. I'm not looking necessarily to listen at high volumes; My speakers are PSB Alpha B1 Bookshelfs (91db/ 6 ohms) in a near field arrangement. Sitting at my computer table is all I use them for, maybe a bit of ambience when company is over.

I'm currently using an aune x2 (TPA3121D2 based model), plenty of power, just not sure what the next step up would be... looking for better sound, not strictly more power
So a desktop 'puter sound setup .. basically.
Up your game with an Audio weenie type setup.
Buy used (wayyy cheaper) and the world's yer Oyster.
A whole new world awaits :-)
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Old 29th October 2013, 10:08 PM   #2214
midyim is offline midyim  Australia
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Join Date: Jul 2012
Location: Brisbane
I had the same issue, it was running @60+degreesC...finally died after a few months. I did not get a response on the Manufacturers Forum either. It wasn't economical to return to China. Looking forward if you find a solution.
Quote:
Originally Posted by bocosb View Post
I have a Hifimediy T1 ALPS vol pot TK2050 STA510 powered by a Mean Well 36V dialed down to 29V measured on outputs. DC offset measured and set to 0.
How hot should the heatsink run? I can keep my finger on the heatsink for about 4-5 sec, is it ok? 29V it's the lowest i can go with this source
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Old 14th November 2013, 01:08 PM   #2215
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Join Date: Jan 2010
Quote:
Originally Posted by hifimediy View Post
Hi, we change the name of boards, so v1>T1 and v2>T2, and keep T3
If a stuck happened:
use a wire to jump the power relay as it showed below; or
use a diode (with relay removed and wire useless) if necessary.
Some one may need this:
I am having issues with a T1 (v1.2b) amplifier. It started with the green light going off after a clicking sound. Then the red light started dimming when turned on. I thought it was the power supply and tested it with another (both 31V) and the red light does not dim, but the green light keeps going off and so to does the music. I have read that this version had problems with the relays and decided to wire a jumper cable as quoted above. This did not solve my problem. i have read that it could be the relay, C32 capacitor or the speaker outlets. I am at a lost. Anyone with advice? Suggestions much appreciated.
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Old 19th November 2013, 07:46 AM   #2216
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Join Date: Jan 2010
The C32 capacitor was leaking so I decided to switch it out and in my haste l lifted the solder pads. Great! Can anyone help me in figuring out how I could use wires from the capacitor leads to their connecting points on the board? Thanks.
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Old 22nd November 2013, 11:14 PM   #2217
PsychoM is offline PsychoM  Belgium
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Join Date: Sep 2011
Hi guys, do you think this is a TK2050 board?
lm1036n 2x50W High-Power D Type Digital Amplifier Board - Blue - Free Shipping - DealExtreme

Because it looks remarkably similar to this one, if you leave the tone controls off: 2 x 50W Dual-Channel Stereo D/T Class Hi-Fi Amplifier Board Module - Blue - Free Shipping - DealExtreme
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Old 19th December 2013, 09:24 PM   #2218
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Click the image to open in full size.


First addtion using stepped ladder attenuator.


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Old 26th January 2014, 10:52 AM   #2219
bocosb is offline bocosb  Romania
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Join Date: Jan 2013
Location: Cluj Napoca
Can someone point me to a case wich fits a t1 with alps pot? i have a meanwell power suplly, i dont know if i can fit it in the same enclosure, maybe a smaller one just for the amplifier board?

Also, have anyone replaced the fan inside the meanwell supply case? It's quite noisy under load
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Old 17th May 2014, 09:26 AM   #2220
baMarek is offline baMarek  Australia
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Join Date: Feb 2009
Could anyone help me identify what has just gone wrong with my T3S?

It just does not want to start anymore. It was always switched off properly, PSU is definitely fine so I have no idea what happened. Basically the behaviour is like that:
- after turning on PSU the red light goes on but the green is only half lit and relays don't kick in
- there is a slight whining noise coming from the board which was not there before
- power consumption is 7.5W
- voltage on coil legs is about 13V for one channel and anything between 0.5 to 7V for the other one

The only mod done was changing the coils to Wurths 4.7uH. They worked fine for about 2 hours before I turned off the amp for the last time. Then it does not want to turn back on. Any help much appreciated.
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