| spzzzzkt |
I'm about to start matching mosfets for a D1 output stage and I'm sure I'm not reading/understanding the schematic correctly:
http://www.diyaudio.com/forums/atta...tamp=1062946522
from searching the archives I understand that R26 and R33 set bias for Q3 and Q6 respectively, and using the I = (V-3)/R formula I calculate a bias current of slightly more than 8mA.
For Q2 and Q5 am I right in assuming that R25 and R32 set bias current and that this is around 18mA?
cheers
Paul |
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| Nelson Pass |
Looks more like 10 mA @ 15V since the Gates should be at around
18V. |
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| spzzzzkt |
Hi Nelson,
thanks for clearing that up. I'm trying to learn how to make sense of the schematics but it's a slow process!! So the network of R24, R21, and P4 set the gate of Q3 to approximately 15V?
btw I discovered your diy opamps article explained why fets give better performance than the mosfets in situations like the I/V. I really should read before asking dumb questions :\
cheers
Paul |
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