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Old 26th April 2012, 07:15 PM   #361
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Quote:
Originally Posted by AudioSan View Post
cascode referance voltage = rail voltage/(R25+R27)xR27
so for 50V rails it will be:
50/(10K+4.75K)x4.75K= 16.1V
for 32Vrails:
32/(10K+4.75K)x4.75K= 10.3V
Audiosan,
Proved these work in real work measurements.
Thank you.

Biasing seems a little trickier than standard F5.
I am going to do some more testing of values for R5,R6. I think I will go to 2.2K from 1K.
I find as the voltage climbs, my pots have limited and timid offset adjustability. I removed the thermistors to see if it helps, and it does not. Makes it easier to set bias for me.

Attached Pic 1 -Cascoded version running 48V, Jfets at ~16v
PIC a version 2 one running strait out.
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File Type: jpg F5TCV2.jpg (49.3 KB, 540 views)
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Old 26th April 2012, 07:22 PM   #362
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good to hear
what is your bias goal? and how many outputs?
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Old 26th April 2012, 07:28 PM   #363
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Quote:
Originally Posted by AudioSan View Post
good to hear
what is your bias goal? and how many outputs?
Well, for testing 1,2,3 and 4 I am trying to build several variations to cover functionality of the board and part behavior.

But does this affect Bias? Both version 2 and 3 schematic show same R values here for R5,R6 - P1,2.
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Old 26th April 2012, 07:34 PM   #364
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the bias will affect the adjustmet of the pots. so for high bias,
it migth be good to change the value of the resistors.
one must just try and see what works best
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Old 19th May 2012, 04:02 AM   #365
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Tea Bag are selling any power supply boards?
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Old 21st May 2012, 10:45 AM   #366
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Quote:
Originally Posted by rubofdagreen View Post
Tea Bag are selling any power supply boards?
wrong thread for my boards - but not currently. I am considering.

I would recommend the one from chip amps.com under the Aleph PS section. If you look around you can get some decent size bug caps on it, plenty of space for 5 .47R resistors and a place for 2.2K 5W bleeder resistors. And six big caps, 4 TO-220 type diodes can go here, and each can have a 2" tall heatsink. I will try to post a pic of one, if nobody has one quickly. It's <10.00usd. That's hard to beat!
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Old 21st May 2012, 12:37 PM   #367
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here is 3 without the diode's one with 6x10.000uF 80V
2 with 6x12.000uF 35V
they all have 2.2Kohm bleeders and 4.7uF bypass caps. CRC resistors is 4x0.47ohm on one. and 5x1ohm on the 2 others.
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File Type: jpg DSC00337.JPG (469.1 KB, 252 views)
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Last edited by AudioSan; 21st May 2012 at 12:39 PM.
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Old 21st May 2012, 02:21 PM   #368
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Chipamp.com Aleph PSU board shown with Antek 400VA shielded transformer -

Click the image to open in full size.
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Old 21st May 2012, 03:41 PM   #369
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Everyone is hopelessly addicted to the F5 amp.
What have you done Nelson?
You have created a conundrum
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Old 21st May 2012, 09:59 PM   #370
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he released a decic
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