Voodoochile
Supafly & The Funky Pimps
- Joined
- Sep 13, 2002
- Posts
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Hi Kevin- I, and I'm sure many others, have been noting higher voltages when matching up transistors for the Dynamic amp.
As an example, I just finished sorting through about 110+ (NPN)2sc1815's. The distribution of values is like this:
30% 11.94v
30% 11.95v
30% 11.97v
and two or three each of other various values, with a low of 11.91v, and a high of 12.02v.
EDIT: These transistors are from two different lots, FWIW.
Your article says approximately 10-11v, which granted is a fairly wide range. 90% of mine are within better than a tenth of a volt of each other- but all are almost a full volt above the range spec'd. I measured the voltage with my DSO, as it's more accurate than my DMM, and am using an Agilent linear bench supply at exactly 16v. The resistors in the jig are matched to within .1%. Of course I do not have a curve tracer, and it's making me crazy.
What does this mean in terms of supply voltage to the amp, if anything? I realize this means 'more voltage gain', but should any accommodations be made for this elsewhere?
Should I just start drinking a few pints and forget about it?
I don't believe I can get past this, otherwise.
edited to reflect that this is referencing the Dynamic amp, not the KGSS
As an example, I just finished sorting through about 110+ (NPN)2sc1815's. The distribution of values is like this:
30% 11.94v
30% 11.95v
30% 11.97v
and two or three each of other various values, with a low of 11.91v, and a high of 12.02v.
EDIT: These transistors are from two different lots, FWIW.
Your article says approximately 10-11v, which granted is a fairly wide range. 90% of mine are within better than a tenth of a volt of each other- but all are almost a full volt above the range spec'd. I measured the voltage with my DSO, as it's more accurate than my DMM, and am using an Agilent linear bench supply at exactly 16v. The resistors in the jig are matched to within .1%. Of course I do not have a curve tracer, and it's making me crazy.
What does this mean in terms of supply voltage to the amp, if anything? I realize this means 'more voltage gain', but should any accommodations be made for this elsewhere?
Should I just start drinking a few pints and forget about it?
I don't believe I can get past this, otherwise.
edited to reflect that this is referencing the Dynamic amp, not the KGSS