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Old 23rd November 2010, 06:38 PM   #41
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Quote:
Originally Posted by generg View Post
Hi Zen Mod,

measured 1,9V across drain resistor input LTP and 0,5V over source resitor of SS is 1,4V, not a good value for Vgsthreshold?
that's good , but what puzzled me is this :
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Old 23rd November 2010, 06:47 PM   #42
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oh, oh, oh ..........

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Old 23rd November 2010, 07:32 PM   #43
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naah ....nothing wrong with little Bahnhof here and there

I'm Bahnhof all the time

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Old 23rd November 2010, 07:36 PM   #44
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There is some Vgs variability in the power Jfets, so 1.2 volts
is only nominal.

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Old 23rd November 2010, 07:39 PM   #45
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yo Papa !



btw - Generg - it's almost frightening to ask you - how many pairs of SS you bought ?

being in at least semi-decent retirement in Vaterland can't be bad ..... I hope and presume
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Old 23rd November 2010, 07:45 PM   #46
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Tomorrow I will make this.....

"In any case, to achieve this 50%, you would have to adjust R15 so that
the AC current through R1 is one half the current going through the
parallel R13 and 14. In the case of the values shown, ( generg: o,33 and two 0,47 parallel in the schematic, remind me that Aleph 3 has other values!)) that means that when the amplifier is driving a load, the AC voltage across R1 is 70% of
the voltage across the combination of R13 and 14. You can use an AC
voltmeter at 60 Hz to check this figure if you need to confirm proper
operation of the circuit. Decreasing R15 increases the percentage, and
vice versa. If you want a switchable variable/constant current source,
install a switch to break the R15 circuit."

Nelson Pass in Zen Var II
Thanks Mr. Nelson!
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Old 23rd November 2010, 07:51 PM   #47
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Quote:
Originally Posted by Zen Mod View Post
Generg - it's almost frightening to ask you - how many pairs of SS you bought ?

let me count....14x SR100 And 4x R500....I lost one SSR100 by accident

when I am ready with my amplifier I will give the rest to friends.....
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Old 23rd November 2010, 07:53 PM   #48
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you have source resistors in both lower and upper half of circ ( meaning on your actual amp)

presuming that they're same in value - and if you have 2-channel CRO , and if you know where are both test-tips ( sonde .... proper Engrish words ?) - just compare AC voltages across lower and upper source resistor
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Old 23rd November 2010, 07:56 PM   #49
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you mean :

Quote:
Originally Posted by generg View Post
..... with my amplifiers ......
seems that you will going to buy few more

especially if you are going to make susy shark


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Old 23rd November 2010, 08:04 PM   #50
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...... you know I passed nearly the whole First Watt Line, thats why I wrote "amplifers". It is such a pleasure to make electronics again, than always teaching........

and I have enough SSR100 to make "susy shark", but I am afraid of heatsinking, transformers etc.
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