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Old 18th October 2012, 01:55 PM   #12611
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Quote:
Originally Posted by Abx74 View Post
I ordered and received F5 stock PCB few days ago, v2.20 and no P3 on board

Damien
you can hard wire the P3 without much problem.
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Old 18th October 2012, 06:08 PM   #12612
Abx74 is offline Abx74  France
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My F5 will be a stock one in first time... Tweaks will come after if necessary.
Transformers will arrive tomorrow, I have ordered two 300VA 2x18V, one for each channel

Damien
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Old 18th October 2012, 06:13 PM   #12613
labjr is offline labjr  United States
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Quote:
Originally Posted by AudioSan View Post
you can hard wire the P3 without much problem.
I wanted to add P3 to my project. I'm a little worrried about causing extra noise, oscillation etc. if the pot is too far from the input FETs.
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Old 18th October 2012, 06:21 PM   #12614
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Originally Posted by labjr View Post
I wanted to add P3 to my project. I'm a little worrried about causing extra noise, oscillation etc. if the pot is too far from the input FETs.
solder the P3 direct to the legs of R1, R2? (10ohm resistors)
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Old 18th October 2012, 09:09 PM   #12615
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Here's the schematic to go with the revised board:

Click the image to open in full size.
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Old 18th October 2012, 10:50 PM   #12616
labjr is offline labjr  United States
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Jack, have you tried moving R1 to the other side of R2 as seen in the F5 Turbo manual?
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Old 18th October 2012, 11:06 PM   #12617
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is there a reason for the 47.5K input impedance? vs. 100K as Cviller's schematics?
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Old 18th October 2012, 11:25 PM   #12618
labjr is offline labjr  United States
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Quote:
Originally Posted by AudioSan View Post
is there a reason for the 47.5K input impedance? vs. 100K as Cviller's schematics?
The changes to the F5 circuit are in the F5 tubo manual. I just figured they are the latest therefore they must make it better.
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Old 19th October 2012, 12:21 AM   #12619
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John,
I see you haven't included the provision for the small value gate stopper resistors (47R & 68R) and filter capacitors on the input jfets, as in your early design with the double sided board?
Did you find these additions to be counter productive?

Is it possible to line the power resistors up "sideways" to attach the Caddock style (TO220/247 packages) power resistors to a common heatsink thru the centre of the board?

And perhaps adding a Cmultiplier/simple zener regulator onto the ends of the board with room for 25mm power supply caps?
__________________
... jh
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Old 19th October 2012, 11:19 AM   #12620
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Quote:
Originally Posted by labjr View Post
Jack, have you tried moving R1 to the other side of R2 as seen in the F5 Turbo manual?
Good idea. The way i have it setup is as a voltage divider for no useful reason! My bad.
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