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Old 14th December 2012, 09:17 PM   #3291
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nothing is stopping you from testing it

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Old 14th December 2012, 09:30 PM   #3292
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I completed F6 with IRF240's.
I used 1R Source resistors. The bias only went to ~500mv with existing 5K Pot.
Assuming I go, to .5R resistor, I think this will give me enough room to bias higher. I was too scared to add pots across the source resistor. With IRF240's I am not sure if that's a good idea, assuming the overall source resistance goes below <.5R overall.
If not I was considering changing R3-4.
Any thoughts?
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Old 14th December 2012, 09:41 PM   #3293
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LED voltage is culprit

what you're using - blue ones , how many in series ?

and - what voltage you're getting across them ?
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Old 14th December 2012, 10:01 PM   #3294
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Quote:
Originally Posted by Zen Mod View Post
nothing is stopping you from testing it

Thanks to Tea-Bag for his high caliber supplies; R100A and the upcoming PCBs. I am slowly following your recommendation.
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Old 14th December 2012, 11:12 PM   #3295
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Quote:
Originally Posted by Zen Mod View Post
LED voltage is culprit

what you're using - blue ones , how many in series ?

and - what voltage you're getting across them ?
ZM - did not even think of that! The only thing Papa asks us to measure
It's 4.05v using one blue and one red Led. I will try two blue ones.
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Old 14th December 2012, 11:14 PM   #3296
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Special thanks to Buzzforb , who's Onetics transformer is in action here.
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Old 14th December 2012, 11:17 PM   #3297
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Old 14th December 2012, 11:27 PM   #3298
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Quote:
Originally Posted by Zen Mod View Post
nothing is stopping you from testing it


Zen Mod. Here is what astounds me by using this example:
  • 0.1% H2 is 1 sine cycle of H2 in 1000 sine cycles of the fundamental H1.
  • The amplitude of one H1 in a reference 2.828 Vrms into 8 Ohms [or 1 W] is equal to (2.828 /1000) = 0.00283 Vrms.
  • If the amplitude of one H2 cycle is equal to that of one H1 cycle, then the answer is 0.00283Vrms across the same 8 Ohms simultaneously stimulated by H1.
  • What is the output power attendant to H2?
  • P{W} = [V X V]/8 = 1 microWatt.
  • But fortunately; human hearing is 1000 times more sensitive in detecting H2 than H1 [just playing with working numbers].
  • Thus, the actual output power from H2 is 1 milliWatt.
In my previous post [Class A/B diyF6], I wanted to raise the power level of H2 to 10-100 milliWattsi in 1W total output power. Afterall, H2 is a desirable distortion; within limits.
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Old 15th December 2012, 12:25 AM   #3299
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Quote:
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ZM - did not even think of that! The only thing Papa asks us to measure
It's 4.05v using one blue and one red Led. I will try two blue ones.
Two Blues give room to bias up much higher. Measures closer to 4.25v now.
I just used two random IRF240's, no matching tried. Offset still good. I will try some matched Fairchilds in the other channel.
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Old 15th December 2012, 12:35 AM   #3300
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Good looking boards. Yup - you need to put LEDs in series or use zener diodes up around 6 volts.

Quote:
Originally Posted by Tea-Bag View Post
I completed F6 with IRF240's.
I used 1R Source resistors. The bias only went to ~500mv with existing 5K Pot.
Assuming I go, to .5R resistor, I think this will give me enough room to bias higher. I was too scared to add pots across the source resistor. With IRF240's I am not sure if that's a good idea, assuming the overall source resistance goes below <.5R overall.
If not I was considering changing R3-4.
Any thoughts?
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