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Silicon Chip ULD Mk3 amp - 0.0006% distortion
Silicon Chip ULD Mk3 amp - 0.0006% distortion
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Old 28th June 2011, 10:52 AM   #1
Circlotron is online now Circlotron  Australia
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Default Silicon Chip ULD Mk3 amp - 0.0006% distortion

July 2011 SC mag.
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File Type: jpg ULD3B.jpg (179.2 KB, 2294 views)
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Old 28th June 2011, 11:07 AM   #2
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Another pic to encourage you all to go out and buy a copy of the magazine.
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Old 28th June 2011, 12:05 PM   #3
lineup is offline lineup  Sweden
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The circuit has:
- PNP input with mirror output
- Darlington VAS
- MJE15030/31 drivers of
- 2 Thermal Trak pairs for output

All is pretty standard for getting high Open Loop Gain
in a blameless topology.
What is 'extra' is the Thermal Trak for good current control.
The amplifier's concept has been tested good many times before.
With a good power supply, I am sure this amplifier is worth the money
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Old 28th June 2011, 12:28 PM   #4
VHF man is offline VHF man  Australia
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Quote:
Originally Posted by lineup View Post
The circuit has:
- PNP input with mirror output
- Darlington VAS
- MJE15030/31 drivers of
- 2 Thermal Trak pairs for output


Changes from the mk2 version:

Only 2x thermaltrak diodes used
2 pole compensation
vbe multiplier and bias trim adjustment
really big cap in the fb network
lower pole frequency input filter

Adds up to - more consistent performance and low measured THD above 2kHz and below 50Hz.
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Old 29th June 2011, 12:30 AM   #5
MurphyUHF10 is offline MurphyUHF10  Australia
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Hi There,

Thanks for the heads-up :-)

I'm a big fan of the MK 1 (stereo kit) which I converted to 'power amp only', and mono-block with custom aussie made transformers,, Sounds great!!

I have no personal experience with the MK 2, but feedback I've always heard is that MK 1 was far superior than the MK 2.. So it will be interesting to see (hear) how Mk 3 compares to MK 1 ??

Thanks
Murphy
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Old 29th June 2011, 12:43 AM   #6
abraxalito is offline abraxalito  United Kingdom
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Quote:
Originally Posted by VHF man View Post
Adds up to - more consistent performance and low measured THD above 2kHz and below 50Hz.
Have you checked the clipping performance? With 2 pole compensation your fellow countryman GK mentioned there were a few caveats somewhere on this forum.
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Old 29th June 2011, 01:11 AM   #7
wahab is offline wahab  Algeria
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Quote:
Originally Posted by VHF man View Post
Changes from the mk2 version:

2 pole compensation

Adds up to - more consistent performance and low measured THD above 2kHz and below 50Hz.
I thouhgt they used TMC , but no , they choosed a less stable method..

Dont they visit DIYaudio sometime ??..
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Old 29th June 2011, 01:20 AM   #8
VHF man is offline VHF man  Australia
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Nicholas does visit us from time to time and I'm sure he will take note of comments.

But to be sure I will forward a link to his e-mail address.
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Old 29th June 2011, 01:28 AM   #9
jcx is offline jcx  United States
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Quote:
Originally Posted by wahab View Post
I thouhgt they used TMC , but no , they choosed a less stable method..

Dont they visit DIYaudio sometime ??..
maybe they read and understand my posts on the issue - TMC is not "more stable"

post #1333: Bob Cordell's Power amplifier book

Last edited by jcx; 29th June 2011 at 01:41 AM.
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Old 29th June 2011, 01:35 AM   #10
wahab is offline wahab  Algeria
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Quote:
Originally Posted by VHF man View Post
Nicholas does visit us from time to time and I'm sure he will take note of comments.

But to be sure I will forward a link to his e-mail address.
Well, it s funny since a version of this amp was discussed by there
and even simulated to see what improvement would bring TMC..

http://www.diyaudio.com/forums/solid...d-extreme.html

Diy audio popular amps simulations
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