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Old 14th November 2008, 01:32 PM   #2031
estman is offline estman  Estonia
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Quote:
Originally posted by zinsula

But Toshiba MOSFET's are not laterals...
Tino

Yes, Hitachi make laterals. And Toshiba mosfets have high transconductance.
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Old 15th November 2008, 12:09 AM   #2032
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Exclamation Sorry

Sorry for trying find out how to build one of these amps
Sorry for posting only three questions in this thread and only getting one answer(AndrewT).
Sorry for interupting all the anal geeks who don't wish to actually build anything. Just wish to discuss 'possibilities'
I'll just go elsewhere and buy a board off 'someone else' doesn't worry me in the slightest.

Maybe there should be a separate thread for people who just want to get this amp built. And are not interested in discussing how one particular part may sound .00001% better if it's replaced and facing 'north east' and the amp is switched on at 3mins past sunset on friday's at 25.575 deg above ambient room temp with a RH of 50% in December.
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Old 15th November 2008, 12:38 AM   #2033
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Default Re: Stupid Question

Quote:
Originally posted by enzedone
Is the track layout correct for P1 & P2?

Hey Enzedone, lighten up, everybody seems to be in his own wave here, sometimes this happens.

Your tracks for the trimpots looks OK to me.

Cheers,
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Old 15th November 2008, 01:02 AM   #2034
flg is offline flg  United States
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Default Re: Sorry

Quote:
Originally posted by enzedone
... anal geeks...

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Old 15th November 2008, 01:43 AM   #2035
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Thumbs up Thank you






Thank you & good night
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Old 15th November 2008, 07:10 AM   #2036
juma is offline juma  Serbia
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Quote:
Originally posted by zinsula

But Toshiba MOSFET's are not laterals...
They are very complementary verticals, with low Vgs threshold.
Tino
Hi Tino,
you are right - I stand corrected. Somehow, when I see 2SK or 2SJ mark i seem to automatically think of Hitachi's 2SK135 and 2SJ50 - the first power MOSFETs I used - decades ago....
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Old 16th November 2008, 12:19 PM   #2037
thermos is offline thermos  Australia
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Default Stupid Question - P1 & P2 Adjustment

Hi,

Before I switch it on.....

I am reading the F5 manual, under "Initial Adjustment".

"you will want to set the values of P1 and P2 to their minimum. Verify this with an ohmmeter"

Just to clarify, does this mean I want to initially set P1 & P2 to be 0 Ohms (or the lowest it will go)?

Thanks
Thermos
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Old 16th November 2008, 12:41 PM   #2038
stein2 is offline stein2  Serbia
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Default Re: Stupid Question - P1 & P2 Adjustment

Quote:
Originally posted by thermos
Hi,

Just to clarify, does this mean I want to initially set P1 & P2 to be 0 Ohms (or the lowest it will go)?

Thanks
Thermos

Yup! zero ohms. Be sure to consider the output DC zero as the most relevant, and measure the volts across the resistors at output devices , the voltage at the input will not affect the final results. Not really important, it's important to get zero DC volts at the speaker output.
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Old 16th November 2008, 12:44 PM   #2039
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Default Re: Stupid Question - P1 & P2 Adjustment

Quote:
Originally posted by thermos


Just to clarify, does this mean I want to initially set P1 & P2 to be 0 Ohms (or the lowest it will go)?


According to my approximation, we will have final values of P1 and P2 at about 1K+something. So, I highly recommend you to start P1 and P2 values lower than 1K.

Be careful, if you have too high P1 and P2 values, the bias current easily goes up more than 10A . . . No good, even if the amp has the current limiter at 10A . . .
>><<



Good luck!

Cheers,

>><<
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Old 16th November 2008, 12:48 PM   #2040
thermos is offline thermos  Australia
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Thanks Stein2
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