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Old 30th November 2010, 07:23 AM   #21
chip_mk is offline chip_mk  Macedonia
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Quote:
Originally Posted by Nelson Pass View Post
I forgot to ask - where did you see that in the data sheets?
Maybe its some mistake in the chart or it is observable only at chip temperature of 25C.
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Old 30th November 2010, 07:56 AM   #22
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or is it just remaining of apple pie , which some Geek had for breakfast ..... while preparing graphs



dunno - I'll check mine in few days ....... need first to sort some other things
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Old 30th November 2010, 09:56 AM   #23
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I'll check mine again....maybe I drunk a lot of rakija and saw 0,3V instead of 0,3mV
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Old 30th November 2010, 10:15 AM   #24
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twice ?

that's Zenovača , for sure
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Old 30th November 2010, 10:23 AM   #25
chip_mk is offline chip_mk  Macedonia
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Quote:
Originally Posted by spavleski View Post
I'll check mine again....maybe I drunk a lot of rakija and saw 0,3V instead of 0,3mV
Check it after cold start and once again after burning up.
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Old 30th November 2010, 05:46 PM   #26
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Quote:
Originally Posted by chip_mk View Post
Check it after cold start and once again after burning up.
My appologize.

With much more attention put now, here comes the results:

COLD Start UP - Left channel - V over R27 = 40 mV => Ig = 0,4mA
WARM - 15 min -Left channel - V over R27 = 0 mV => Ig = 0 mA

COLD Start UP - Left channel - V over R32 = 20 mV => Ig = 0,2mA
WARM - 15 min -Left channel - V over R32 = 0 mV => Ig = 0 mA

COLD Start UP - Right channel - V over R27 = 0 mV => Ig = 0 mA
WARM - 15 min -Right channel - V over R27 = 0 mV => Ig = 0 mA

COLD Start UP - Right channel - V over R32 = 0 mV => Ig = 0 mA
WARM - 15 min -Right channel - V over R32 = 0 mV => Ig = 0 mA

Seems taking rakija and measuring is not going hand by hand

Sorry again for doing first measurements without paying too much attention. Boards are not so easy accessible....
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Old 30th November 2010, 08:11 PM   #27
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Quote:
Originally Posted by chip_mk View Post
Maybe it’s some mistake in the chart or it is observable only at chip temperature of 25C.
Wow, you have sharp eyes. My sensitivity is down to
100 nA, and I don't see that for Vgs from 0 to
the value for 3A Ids, and for Vds of 0 to 40V.

In any case, even 0.4 ma looks to be a lot.

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Old 30th November 2010, 08:24 PM   #28
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Quote:
Originally Posted by Nelson Pass View Post
...
In any case, even 0.4 ma looks to be a lot.
Thanks Mr. Pass for Your kind comments.

I must take another Zenovacha and I'm shure it will come down to Zero Ohma after that. Seriously speaking , most probably it is about bad contact connection during measurements. Soon I will replace 3W resistors with a MOX type, and will take out the boards and will re-check one more time. Seems to me that really there shoudn't be a problem if some uA of Ig ig flowing. Once more time, thank You very much for a Gorgeous Amplifier made with SS Mosfets.
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Old 30th November 2010, 08:28 PM   #29
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At the moment Bias is set to Id = 1,85A and Vds = 20V with inputs grounded. Sound is
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Old 30th November 2010, 08:37 PM   #30
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Quote:
Originally Posted by Nelson Pass View Post
..... My sensitivity is down to
100 nA, ......
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