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Class D Switching Power Amplifiers and Power D/A conversion

Sure Electronics Tripath boards?
Sure Electronics Tripath boards?
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Old 11th December 2007, 12:23 PM   #11
audio1st is offline audio1st  United Kingdom
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Received mine today and they look well made..But... The first thing you must do is remove C3 and C24, these are killing it's sound.....
The input caps are C13 and C21, they are 800nf and think should be OK with the small output inductors...
I'll have a bit more of a listen......
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Old 11th December 2007, 12:53 PM   #12
Lostcause is offline Lostcause  United Kingdom
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Quote:
Originally posted by audio1st
Received mine today and they look well made..But... The first thing you must do is remove C3 and C24, these are killing it's sound.....
The input caps are C13 and C21, they are 800nf and think should be OK with the small output inductors...
I'll have a bit more of a listen......
Hmmm, still not got mine yet.....

Hi Barry, I guess all those resistors are the DC correction circuit?
What size output inductors do you reckon it's got?

I think I'm gonna have a go at an i-pod amp that is dc coupled via the bias cap and get rid of all the input section, even use higher grade input resistors...... If I have the ipod on battery and the amp on an SMPS it should be a neat little amp.

I think I'll put some nice big supply caps in there as well and maybe replace the diodes (I got a job lot when I started these amps and still have a bag left )
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Old 11th December 2007, 02:04 PM   #13
Robert_S is offline Robert_S  United Kingdom
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I received mine this morning.

On comparison to a stock Sonic Impact, it does not have the same Tripath 'magic', the sparkle and life in the higher frequencies is missing (though it does have more bass), it's dull by comparison, and gives considerably less output volume.

I tried it with 4 ohm floor-standers (AR-915s, which, astonishingly, sound incredible with the original S.I. T-Amp), and also with 8 ohm AR18s bookshelf speakers; it sounds better with the AR18s, (though not as good as a Charlize).

If this was my first exposure to the Tripath sound, I'd primarily be impressed by the value for money, the sound is smooth and easy with the 18's (though doubtless, those who know how to mod these things, could make considerable improvements).

Robert_S
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Old 11th December 2007, 03:07 PM   #14
audio1st is offline audio1st  United Kingdom
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Quote:
On comparison to a stock Sonic Impact, it does not have the same Tripath 'magic', the sparkle and life in the higher frequencies is missing (though it does have more bass), it's dull by comparison, and gives considerably less output volume.
It sounds bad because of C3 & C24, they are 100nf caps across the supply and cause a passive volume control to act as a tone control..REMOVE C3 & C24..
Quote:
Hi Barry, I guess all those resistors are the DC correction circuit?
Hello Lee, I don't know what all the 22k resistors are for yet, DC offset is about 500mv on both boards I've got..
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Old 11th December 2007, 03:38 PM   #15
Robert_S is offline Robert_S  United Kingdom
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Quote:
It sounds bad because of C3 & C24, they are 100nf caps across the supply and cause a passive volume control to act as a tone control..REMOVE C3 & C24..
Hey! I heard you the first time ;^)

Thanks for your advice, I'll try that.

Robert_S
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Old 11th December 2007, 07:44 PM   #16
Kooka is offline Kooka  Italy
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Quote:
Originally posted by audio1st

It sounds bad because of C3 & C24, they are 100nf caps across the supply and cause a passive volume control to act as a tone control..REMOVE C3 & C24..

Hello Lee, I don't know what all the 22k resistors are for yet, DC offset is about 500mv on both boards I've got..

In your picture C24 looks still onboard.. am I wrong?
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Old 11th December 2007, 07:45 PM   #17
Kooka is offline Kooka  Italy
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Quote:
Originally posted by Kooka



In your picture C24 looks still onboard.. am I wrong?
Sorry, I just magnified now the pic: C24 is out
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Old 11th December 2007, 09:43 PM   #18
nbrophy is offline nbrophy  United States
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Default Questions

After I fried my 1st T-Amp board with shoddy solder, this may be the prefect alternative to purchasing another T-amp.

The link to the "User's Manual" is broken on the auctions. Anyone have this?

Lostcause,

How can you compensate for not having a tank cap? I still have my 680uF Panasonic FM series cap from my 1st failed mod attempt. Can it be used on this board?
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Old 12th December 2007, 05:03 PM   #19
bonjonno is offline bonjonno  United States
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I sent them a message about the bad link and they fixed it; but the "manual" is simply a basic wiring diagram for ins, outs, and ps. Pretty, but no help.
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Old 13th December 2007, 11:49 AM   #20
audio1st is offline audio1st  United Kingdom
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Had a bit of time to look a little closer at the board.
The DC offset cct IMO has all the wrong value resistors and seems of no help..I think 500mv is a bit high and probably more than it would be without the offset cct?
I think C3 and C24 should have been 100pf and not 100nf across the input..
The Mute and Sleep pins seem of no use and the fault pin is not connected to anything so I guess if a fault occurs no auto reset will happen..
All power inputs are via D1 to prevent incorrect polarity connection, so if you don't like the idea of a diode in the supply you will need to remove and short it's terminals..
I haven't looked at the output side, except that the inductors are 22uH..
But it does sound pretty good as is and I'm SURE could sound even better...
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