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Old 7th January 2012, 06:33 AM   #1961
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In my opinion, there is harmless to short the inputs when input caps exist. But when you remove the caps, it's become complicate and we don't suggest try to do that.
And the outputs can not be shorted any time.
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Old 7th January 2012, 12:44 PM   #1962
sst4270 is offline sst4270  United States
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Default shorted inputs

@hifimediy

Thanks, that's exactly what I thought. I'm just trying to understand what happened to my amp before sending it back. Just in case the fault was mine I don't want to make the same mistake twice when the new board arrives. At this point I can think of nothing else that I did wrong. So, I'm presuming that there was a faulty component(s) on the board.

-Steve
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Old 8th January 2012, 09:38 PM   #1963
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Quote:
Originally Posted by hifimediy View Post
I never tried that before, so your experience could be a lesson to us.
To be honest, I have to specify I'm not sure about the real cause...[I didn't try again!!!that smoke made me afraid!!]
I have to be more precise:
Click the image to open in full size.
the pot I have has printed circuit terminals,but this one isn't on a board [I didn't have much money to spend on this, and in the shop where I bought some other material there was only this -good- stereo 50k log pot ]; the pot is on a grounded metal U...while I was working on the pot axis and knob, some of the wires around the terminals could have touched the metal support...so...ground loop?Short between LR channels?Really don't know, but however the result was not less than curious..
This is T4 now....
Click the image to open in full size.

and my hand built bang for bucks system...[this is my lab/study-room

Click the image to open in full size.
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Old 9th January 2012, 01:31 PM   #1964
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Just a little follow up.
I'ts now 5 months that I'm driving my speakers (inefficent and low cost TQWT's, but homemade) with a T2 powered by a Connex 300R SMPS, all unmodified, in a power-amp setup (no volume control - stock pot all turned up).
I assembled it all following the guide user Alkasar wrote and posted on a french forum. Very well done. This alliance worked from the beginning, rock solid, no noise or hum at all (the low sensibility of the speakers and the distance between the SMPS and the T2 may help), no difficulties in handling fast transients or long listening sessions.
Soundwise I'm not missing my Denon and Rotel integrated amps at all, much more muddy and less detailed in the low-mids section, where the T2 is still capable of delivering a firm and solid bass. The highlight for me is the reproduction of acoustic instruments (as a half musician): as someone said earlier, you discover much more instruments in your favorite recordings (and the capabilities of the sound recording engineer) never loosing the music as a whole.
Power wise i feel it's better suited for high sensibility speakers (>92 db or so), but I'm still capable to reach normal to high listening volumes with my 86 db speakers in an average apartment living room (maybe 20 sq. m.) without any distortion.
I'm very happy with the result, time will tell about the quality of the used components and of my assembling skills, but from a first impression the two modules are clean, well manufactured and assembled. The only thing I miss is the ROHS compliance, but this discussion should be made in a separated thread.

I would recommend it to everyone with high expectations and basic skills, wanting to improve his own listening experience.
But beware, it's addictive. Once your defeat the marketing voodoo of big companies and you start to understand the (few) important rules of sound reproduction and electronics it's very difficult to stop.
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Old 9th January 2012, 01:44 PM   #1965
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Quote:
Originally Posted by portomomo View Post
Just a little follow up.
Power wise i feel it's better suited for high sensibility speakers (>92 db or so), but I'm still capable to reach normal to high listening volumes with my 86 db speakers in an average apartment living room (maybe 20 sq. m.) without any distortion.
I think that if you take the T2 to maximum voltage and/or increase the gain a little bit, I'm fairly sure that it can work well with lower sensitivity speakers.

Quote:
Originally Posted by portomomo View Post
I would recommend it to everyone with high expectations and basic skills, wanting to improve his own listening experience.
But beware, it's addictive. Once your defeat the marketing voodoo of big companies and you start to understand the (few) important rules of sound reproduction and electronics it's very difficult to stop.
Well put!! Completely agree.
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Old 12th January 2012, 02:36 PM   #1966
lovro is offline lovro  Croatia
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Quote:
Originally Posted by hifimediy View Post
Hi, if the channel has no problem to play music, we can say the trimmer(R22/R23) or resistor RP1 on the bottom side is down/bad soldered.
Hi,
well I have checked the rp1 and the trimmers extensively. Everything seems to work as expected.
I have reflowed all the solder joints.
I am getting the whole range (0-5v) on the trimmers.
I have also reflowed the solder joints on the R1,R2,R3,R5 resistors.
All the values of the resistors I am measuring in circuit seen the same as on the properly functioning board.

And still everything is the same, I am getting 65mv on one channel.
What should I do next?

Lovro
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Old 12th January 2012, 05:11 PM   #1967
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Quote:
Originally Posted by portomomo View Post
But beware, it's addictive. Once your defeat the marketing voodoo of big companies and you start to understand the (few) important rules of sound reproduction and electronics it's very difficult to stop.
I fully agree!!
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Old 13th January 2012, 01:31 AM   #1968
boone is offline boone  United States
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Greetings,

I'm hooking up a T2 special version with Connexelectronic smps 300r (both purchased from hifimediy) and I'm slightly confused. The user manual (for the T2) says "for DC it does not matter where you connect + and -". My understanding from reading post by Christi of Connexelectronics is that + and - on single output voltage version of the smps300r are connected with a jumper so that they are both +. So my question is -- as it seems I can pick either the positive or negative spade and will get the same + output does the other terminal on the T2 get connected to the ground spade on the power supply?

Thanks
boone
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Old 13th January 2012, 06:13 AM   #1969
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Hi, noob here, probably with a question that will be annoying! Basically I don't have any experience with soldering and don't even own a iron, nor can I for the life of me work out what I would make an enclosure out of...I don't have a smelly old cigar box laying around. I'm just looking for a half decent ready to run amp based on the tk2050 IC, for use with my PC. Currently I've got a 2.1 set of Acoustic Energy Ageo M's:

http://www.amazon.co.uk/dp/B000MN96T...SIN=B000MN96T6

Would one of these be an improvement:

NEW TOPPING TP22 TP-22 & TK2050 T-AMP 2X30W & Tripath Class | eBay

I realise this is far tamer than any of the 2*100/4*100 boards being discussed hear (and possibly more money) but I will absolutely 100% mess up with a DIY job and don't want something that looks like a 5yr olds project! BTW I do also own an Onkyo TX-SR606, 8 chan AV receiver but it is absolutely huge and I've heard it's not very musical (right now its in the garage--no space). I would also need some bookshelf's as I don't have anything appropriate right now, any low cost suggestions would be great!
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Old 13th January 2012, 12:50 PM   #1970
alkasar is online now alkasar  France
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Quote:
Originally Posted by boone View Post
Greetings,

I'm hooking up a T2 special version with Connexelectronic smps 300r (both purchased from hifimediy) and I'm slightly confused. The user manual (for the T2) says "for DC it does not matter where you connect + and -". My understanding from reading post by Christi of Connexelectronics is that + and - on single output voltage version of the smps300r are connected with a jumper so that they are both +. So my question is -- as it seems I can pick either the positive or negative spade and will get the same + output does the other terminal on the T2 get connected to the ground spade on the power supply?

Thanks
boone
You're confused with Power supply and amp board.

connect like this and it will be ok

Click the image to open in full size.
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