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Old 27th January 2009, 01:03 AM   #2491
labjr is offline labjr  United States
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Oh I'm mistaken. I have cvillers boards. They're both blue. I may use wires to move the MOSFETs farther apart though. I'll need to use wires on the thermistors too.
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Old 27th January 2009, 02:11 AM   #2492
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by woodturner-fran
......
Also, somehow I ordered 47k instead of 47R for R13 and R14. The BOM is correct so no biggie there. I have only some very crappy carbon film 1/8W 47R here or a good number of nice Dale 100R. Which should I go with?
.....

there is a big chance that you'll like difference - with dreky carbon ones ;

under condition that you can hear difference , at all ....

( just look what Papa is constantly putting in his baaad amps - nothing more than plain industrial quality .......... )
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Old 27th January 2009, 04:00 AM   #2493
EUVL is offline EUVL  Europe
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> I understand you run the amp balanced. Did you experience more body and improved dynamics comparing to single channel?

It is difficult to say, as I only tried single briefly, but with the same increased bias and reduced voltage. There is no lack of dynamics even in single, but it changes the characteristics of the sound just a touch, like you change from Aleph to Aleph-X (or 2nd vs 3rd harmonics, that sort of change).

Peter is known for optimisation with PSU and passive components. So I am among all the others looking forward to your experimental findings. Pls keep us posted.

(I am using PRP 0.25W and 1W resistors, and MPC74s for source resistors, as in earlier photos).


Patrick
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Old 27th January 2009, 06:54 AM   #2494
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Yes, while the boards are small - I see that with mounting them a little further apart and using wires means that I can place them very evenly on the neatsink. The boards are lovely quality.




Zenmod: So you reckon I should just go ahead and use the carbon film 47R? Is it ok that they are only 1/8W?



Fran
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Old 27th January 2009, 08:12 AM   #2495
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by woodturner-fran
.......

Zenmod: So you reckon I should just go ahead and use the carbon film 47R? Is it ok that they are only 1/8W?



Fran

they're certainly good enough ;

just be sure that resistor leads aren't made of kryptonite ........
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Old 27th January 2009, 12:50 PM   #2496
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nah, not krytonite! more likely the cheapest crappy stuff that could be found. I hope to do more tonight and get it running pretty soon!

Thanks for the advice.

Fran
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Old 27th January 2009, 07:06 PM   #2497
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Default f5 pcb

hi..my friend draw this for me..i wanna build f5 amp to 50cm of heatsink..for good cooling we decided to put the mosfets far eachother..what do you think about this?thanks
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Old 27th January 2009, 07:12 PM   #2498
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Default Re: f5 pcb

Quote:
Originally posted by umut1001
hi..my friend draw this for me..i wanna build f5 amp to 50cm of heatsink..for good cooling we decided to put the mosfets far eachother..what do you think about this?thanks
Putting the MOSFETs far from each other isn't a bad idea (depending on your heatsinks), but why not use wires instead of making the board so large? It would at least be cheaper to make smaller boards...

-j
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Old 27th January 2009, 07:48 PM   #2499
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i dont know maybe to prevent the capacitance effect of the cable..nelson uses long pcb..
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Old 27th January 2009, 07:59 PM   #2500
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Which have long traces?
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