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Old 28th February 2014, 10:53 PM   #3831
Salas is offline Salas  Greece
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Quote:
Originally Posted by Scorpion View Post
Hi everyone,

Here is a thread about some resistor tryouts in the Salas hotrodded DCB1...
Salas hotrodded DCB1 resistor tryouts

Let's have some fun and see what comes out of it ;-)

Regards

Scorpion
Wishing you it will stay just a "fun" thread.
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Old 28th February 2014, 11:14 PM   #3832
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Yep !!!

Can already imagine believers vs nonbelievers starting a guerilla over the difference in sound (or lack of) between different types and brands.

Measures and science vs what one's hears detect or how he feels (can it really be measured ?) while experimenting. Already expecting the "biased" stuff popping up...

I will post my findings no matter what. And some pics as well.

If there are audible differences, ok. If not, so be it.

Regards

Scorpion
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Old 4th March 2014, 02:11 PM   #3833
nbivol is offline nbivol  Turkey
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Hi Salas
Is there any problem if I use 100uf/16V instead of recommendet 100uF/25V ? Just have two of BG N out of buisness from another project.
Thanks
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Old 4th March 2014, 06:44 PM   #3834
Salas is offline Salas  Greece
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Not a problem. Its just 10V there across each of those caps.
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Old 4th March 2014, 07:28 PM   #3835
nbivol is offline nbivol  Turkey
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Quote:
Originally Posted by Salas View Post
Not a problem. Its just 10V there across each of those caps.
Thank you
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Old 14th March 2014, 08:22 PM   #3836
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I'm trying to figure out if my trafo is enough or not.
At the moment I have 16.5V after rectifiers. Regulated out is 10.4.
I measured 2.1V on the resistors (11 ohm) and about 3.8V on the IRF.
So I'm not really sure if this will be enought or I should get a bigger trafo? Or short circuit 1 LED and get about 8.5V reg out?
The absolute minimum is the regout+IRF+res voltages?
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Old 14th March 2014, 08:28 PM   #3837
Salas is offline Salas  Greece
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5V difference DC in minus DC out is a safe minimum. More would be welcome but not an absolute must. Don't use 8.5V bcs l had found 10V more pleasing among many options during the original development.
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Old 15th March 2014, 12:44 PM   #3838
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5V?
But the IRF needs about 4V and also 2V drops on the resistor. That is 6V already. That is why I asked that I barely have any margin if error. 10.4 (out)+3.8 (IRF)+ 2.1V (resistor) is 16.3V. Are you sure about the 5V?
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Old 15th March 2014, 01:58 PM   #3839
Salas is offline Salas  Greece
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No, its VGS is developing between DC raw and towards GND not between DC raw - DC out. That drop across is VDS. Its current is ICCS=(VRdrop=VFtot(LEDS)-VGS)/R.
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Old 15th March 2014, 07:02 PM   #3840
Stixx is offline Stixx  Germany
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Quote:
Are you sure about the 5V?
That's a good one... Salas are you really sure ?
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