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Old 29th November 2009, 12:05 PM   #71
mos57 is offline mos57  Italy
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Quote:
Originally Posted by Sendy View Post
Real measurements from PMA "s laboratory, no smoke, no fog, no fantasy :
http://web.telecom.cz/macura/step_response_pa2.png
SR= 90%-10% Vout

From you grafic Vout=40 V
so: 36-4=32V for 500mSec = 64V/uSec as said John.

Francesco.
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Old 29th November 2009, 12:36 PM   #72
mos57 is offline mos57  Italy
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Quote:
Originally Posted by mos57 View Post
SR= 90%-10% Vout

From you grafic Vout=40 V
so: 36-4=32V for 500mSec = 64V/uSec as said John.

Francesco.
500nS not mS, sorry
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Old 29th November 2009, 12:41 PM   #73
Sendy is offline Sendy  Czech Republic
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Sorry, its difference between definitions....

-SR represents the maximum rate of change of a signal at any point... max(abs(dV/dt))
Slew rate - Wikipedia, the free encyclopedia

-90-10% - it may be used for measuring rise or fall time, not SR.
Rise time - Wikipedia, the free encyclopedia
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Old 29th November 2009, 12:48 PM   #74
wahab is offline wahab  Algeria
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Quote:
Originally Posted by Sendy View Post
Sorry, its difference between definitions....

-SR represents the maximum rate of change of a signal at any point... max(abs(dV/dt))
Slew rate - Wikipedia, the free encyclopedia

-90-10% - it may be used for measuring rise or fall time, not SR.
Rise time - Wikipedia, the free encyclopedia



agree, but let say that 64V/uS is the mean SR of this amp, as the
(abs(dv/dt)) is the instataneous value...so MOS57 is also right...
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Old 29th November 2009, 01:40 PM   #75
BV is offline BV  Slovakia
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Federmann, what you measured in post 61? It is far away from your simulations and it is very poor result. Or you must it heavily compensate, because it was oscilator?
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Old 29th November 2009, 02:04 PM   #76
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Quote:
Originally Posted by BV View Post
Federmann, what you measured in post 61? It is far away from your simulations and it is very poor result. Or you must it heavily compensate, because it was oscilator?
I know it's not the best result. I used the probe 10:1, and the voltage was greater. As I wrote, yet I can not disclose more.
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Old 29th November 2009, 05:53 PM   #77
danhard is offline danhard  Czech Republic
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So you let the secret to another thread. It does not belong here.
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Old 30th November 2009, 01:20 PM   #78
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Hi Pavel,

what do you think about lateral mosfets as output transistors? No regarding measurements but sound quality ?

regards
eD
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Old 30th November 2009, 01:50 PM   #79
danhard is offline danhard  Czech Republic
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PMA this amplifier described on its Web
PA2 power amplifier
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Old 30th November 2009, 05:05 PM   #80
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by EDDELARUE View Post
Hi Pavel,

what do you think about lateral mosfets as output transistors? No regarding measurements but sound quality ?

regards
eD
For what it's worth I can tell you what I think... absolutely the best

Based on listening to many amps over the years
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