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#41 |
diyAudio Member
Join Date: Jul 2005
Location: D-55629 Schwarzerden
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#42 | |
diyAudio Member
Join Date: Jul 2005
Location: D-55629 Schwarzerden
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Quote:
http://www.diyaudio.com/forums/solid...amplifier.html ) In respect of ultra low impedance loads this approach seems to be the best from my view. Thanks for advices. |
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#43 |
diyAudio Member
Join Date: Oct 2004
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#44 | |
diyAudio Member
Join Date: Jul 2005
Location: D-55629 Schwarzerden
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Quote:
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#45 |
diyAudio Member
Join Date: Oct 2004
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For the output section of Mr Self's design, AD797 would require double the number of opamps and make it rather expensive.
(I picked other opamps for the front end, plus fet-input opamp for the servo instead of OP177, use it as headphone amp for an AKG) Last edited by jacco vermeulen; 9th February 2016 at 06:46 PM. |
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#46 |
diyAudio Member
Join Date: Oct 2008
Location: Vancouver
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1 thing. The drivers see all those output transistor input capacitance in parallel. Don't know how this compares with one high power transistor.
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#47 | |
diyAudio Member
Join Date: Jul 2005
Location: D-55629 Schwarzerden
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Quote:
The actually question is here, what kind of audible effects and distortions occurs on the different circuit topologies (with and without global NFB so as with global NFB only for LTP/VAS like used in Nelson's STASIS series) |
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#48 |
diyAudio Member
Join Date: May 2018
Location: Cambridge UK
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An advantage of using many smaller transistors is that secondary breakdown is avoided, so long as adequate current sharing emitter resistors are used. A single power transistor die is large and thermal gradients can build up between different parts of the die leading to hot-spots (the mechanism of secondary breakdown).
Another advantage I can see is that if one device fails short, it will be vaporized quickly by the opposite side devices acting in concert, becoming open circuit and leaving the amp still functioning - cascade failure is less likely. Against this is the fact that failures are more likely with more devices, and severe voltage spikes are going to affect multiple devices anyway. |
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#49 |
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Join Date: Oct 2012
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Thread | Thread Starter | Forum | Replies | Last Post |
small-signal (small-power) fast switching complementary transistors | Lola Luna | Solid State | 3 | 8th April 2010 08:51 PM |
small signal transistor | icko | Solid State | 13 | 13th May 2009 02:01 AM |
Safe use of unknown small signal transistors | mashaffer | Parts | 8 | 29th July 2008 01:35 AM |
Using Many Small Signal transistors for the output stage Update!! | John Biles | Solid State | 10 | 14th August 2005 05:58 AM |
16 paralleled LM3886s or output transistors? | xplod1236 | Chip Amps | 21 | 29th November 2004 10:32 PM |
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