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Old 24th April 2010, 04:22 AM   #41
fr1s is offline fr1s  Canada
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Quote:
Originally Posted by ciagon View Post
A transformer with 25V AC seconday outputs will give you 35V DC rails (25*1.41). It is an easy mistake to make.
U got me confused there

Quote:
Well he's talking DC voltage... not the same thing to use when shopping for transformers. LOL
Most 8 ohm speakers are closer to 6 ohms minimum. So the transformer I linked to IS what you want.

ok thx for help guys, I'm a bit of a newb and this is just my second amp I've ever built! first one was lm1875 and I'm my self in grade 12 yes high schooler...
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Old 24th April 2010, 04:36 AM   #42
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50K linear pot or this stepped atten should be good DACT Type 21 Stepped Attenuator Potentiometer 50K 300B - eBay (item 120473999989 end time Apr-24-10 11:05:02 PDT)

heatsinks use 2 (HSK) HS-TWD here Heatsinks - Medium, One Surface
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Old 24th April 2010, 04:43 AM   #43
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Originally Posted by infinia View Post
guys said that 10k would be better, is it right? or should i still go with 50 k?

thx for Potentiometer link and I dont really have to worry about heat sinks, I got box of them in school, we took apart over 10 PC's last year in my class
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Last edited by fr1s; 24th April 2010 at 05:00 AM.
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Old 24th April 2010, 05:17 AM   #44
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Either one would work good.
It only depends if you prefer a stepped type control or smooth feel control.
Figure on values of not more than 100k and not less than 5K. jer

Last edited by geraldfryjr; 24th April 2010 at 05:20 AM.
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Old 24th April 2010, 05:19 AM   #45
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what the difference between them? clicking on the steped one?
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Old 24th April 2010, 05:34 AM   #46
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With the stepped your stuck with whatever the steps are and not in between.
For instance you may have a setting that is okay but a tad to loud but the next setting below that is not loud enough like on some tv sets with digital control volume.
Again it is a matter of prefernce,I like having full control over were I set the volume instead of a predefined step unless it was calibrated in say .25db or .1 db steps.
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Old 24th April 2010, 05:45 AM   #47
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I wouldn't worry too much about using 50K as the real impedance is loaded down with the chip amps 22K input. Using a pot you don't have discrete steps so it's smoother in adjustments compared to a stepped switch.
On 2nd look the 21 stepped atten look cheapish ... not sure about the contacts wearing down with use and contaminants. Pots come with variable quality as well.
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Old 24th April 2010, 06:02 AM   #48
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Yes ,infinia,I agree they don't look to be of very high quality and would probably start to fail after the first year or two .
Good decent quality selector switches that can handle being turned constanly don't come cheap.
Just the same as I have to replace the switches on my guitars ever few years,especialy on my fender stratocaster, I have replaced that one three times already in the last ten years. jer
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Old 24th April 2010, 06:07 AM   #49
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so Iguess I just need regular 50k potentiometers?? couse I kinda hate digital thing with the steps like i got on my tv
but sound quality vise which one is better?
if you have specific recommendation post them please
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Old 24th April 2010, 06:19 AM   #50
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I don't think that you are going hear any difference in sound quality as they are resistors and don't have any recactive qualities or components involved,but i'm sure someone will probably want to argue over that one. jer
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