SOAP MKIII (Simple OpAmp Pre) With onboard PSU - Page 13 - diyAudio
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Old 17th January 2009, 07:20 AM   #121
zei is offline zei  Sweden
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All boards are gone no new ones are planned within a near future..

The tripots can of course be subsituted with a resistor.
Howeverthe reason for the trimpot is to easy trim the voltage coming from the PSU part.



Thanx
/JZ
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Old 17th January 2009, 07:22 AM   #122
zei is offline zei  Sweden
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gabanyayaya


I understand what you meen now and No. You can not omit the pots just because you have a 15V tranny.

You still have to use them to trim the voltage.

/JZ
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Old 17th January 2009, 08:09 AM   #123
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Quote:
Originally posted by zei
All boards are gone no new ones are planned within a near future..

I'll take one please.
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Old 17th January 2009, 08:29 AM   #124
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Originally posted by zei
gabanyayaya


I understand what you meen now and No. You can not omit the pots just because you have a 15V tranny.

You still have to use them to trim the voltage.

/JZ

I see now.........just now you said the pot can be substitute by a resistor. What values??? Is there's any different using this resistor compared to trimpot in term of SQ...? Do you think using a resistor is an alternative way to complete the power supply section without using a multi meter/volt tester?
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Old 17th January 2009, 08:54 AM   #125
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Quote:
Originally posted by gabanyayaya



I see now.........just now you said the pot can be substitute by a resistor. What values??? Is there's any different using this resistor compared to trimpot in term of SQ...? Do you think using a resistor is an alternative way to complete the power supply section without using a multi meter/volt tester?

Hi Gabanyayaya

You can use the following voltage calculator to help you determine the correct resistors

http://www.justblair.co.uk/lm317-vol...alculator.html

(A shameless plug for Blair's website)

Regards

Richard
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Old 17th January 2009, 11:11 AM   #126
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Quote:
Originally posted by Tripmaster



Hi Gabanyayaya

You can use the following voltage calculator to help you determine the correct resistors

http://www.justblair.co.uk/lm317-vol...alculator.html

(A shameless plug for Blair's website)

Regards

Richard

Wow...this sure is helpful. Thanks Tripmaster. Funny though because I used to talk each other with Mr. Blair few months ago but not about chipamp but a speaker modding and I did what he told me about my speaker...
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Old 17th January 2009, 11:43 AM   #127
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Buy how about LM337? any calculation for this regulator?
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Old 17th January 2009, 11:48 AM   #128
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Quote:
Originally posted by gabanyayaya
Buy how about LM337? any calculation for this regulator?
I think its the same, someone may know different
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Old 19th January 2009, 07:47 PM   #129
Puffin is offline Puffin  United Kingdom
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Can any of you geniuses out there (a few regular posters spring to mind) give me a definitive answer as to whether this board has any DC blocking on it.

I had a problem with mine at the weekend and when testing/playing with it, it blew an old speaker! A strange noise and then....phut!
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Old 19th January 2009, 08:10 PM   #130
zei is offline zei  Sweden
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You have put the caps on the output?
That should take of most junk.
So it sounds like there is something else that is the cause..

Can we have a picture perhaps?

Lets start with that.. oh and also what poweramp are you using.?

/JZ
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