Mezmerize DCB1 Building Thread - Page 54 - diyAudio
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Old 3rd May 2012, 05:29 PM   #531
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The speakers are Scan A4 Monitor SE.

Quote:
Originally Posted by AndrewT View Post
Andreas' creations deserve a permanent place in the PICs Thread.

I particularly like the "family" look of post528. Nice !
Except for the bluleds
Thank you, Andrew.
If you have a look at "Pictures of your diy Pass amplifier" you will see Aleph J, Aleph P1.7 and ONO in the "family" look and blue led as well
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Old 3rd May 2012, 05:35 PM   #532
Salas is offline Salas  Greece
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Low coloration mini monitors with Scandinavian drivers then. With how many Watt they get happy? Are they low sens & low impedance?
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Old 3rd May 2012, 05:40 PM   #533
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Quote:
Originally Posted by KatieandDad View Post
Nicely finished but your heatsinks are doing virtually nothing the way you have them orientated.

You could cut 3/4 of the lenth of them away and they would be doing the same for your heat disipation.

Look back at post #501 to see how to mount the heatsinks more efficiently.

If you are only running at 100mA or so then it probably wont hurt as the MOS-FETs will be running fairly cool anyway.

With the 10R resistors in the photo the MOS-FETs don't really need any heatsink at all. I've just been experimenting with 3R0 and 4R7. At 3R0 even the 2E heatsinks that I used are barely sufficient and the MOS-FETs are running too hot for my liking - allbeit only about 55 Degrees C. I haven't tried the 4R7s yet as I'm enjoyiong it too much.

Last edited by KatieandDad; 3rd May 2012 at 05:48 PM.
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Old 3rd May 2012, 05:55 PM   #534
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Stock for suitable relays are becoming more difficult to find.

Has consideration been given to this for the future?

Is EA2-12-DC12V equivalent to EA2-12NJ-DC12V?

I think the "NJ" designator is for "trimmed leads" and would have no affect upon function.
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Old 3rd May 2012, 06:05 PM   #535
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They seem to still be commonly available from the far east on E-Bay.
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Old 3rd May 2012, 06:12 PM   #536
Salas is offline Salas  Greece
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Quote:
Originally Posted by Ed LaFontaine View Post
Stock for suitable relays are becoming more difficult to find.

Has consideration been given to this for the future?

Is EA2-12-DC12V equivalent to EA2-12NJ-DC12V?

I think the "NJ" designator is for "trimmed leads" and would have no affect upon function.
NEC EA2 series? Those are compatible and can even arguably have the best contact quality.
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Old 3rd May 2012, 06:19 PM   #537
Salas is offline Salas  Greece
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NJ means trimmed leads type says in their datasheet. It normally means some legs formation style, but they don't show it. You got to get a sample or they send you a picture first to see if its a problem.
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Old 4th May 2012, 03:58 PM   #538
atupi is offline atupi  Romania
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I have finished this project and i have the following problem on the first test: on the negative rail the group of 5 leds is not lit and the paraleled group of resistors becomes hot very fast (few seconds). Any clue where to look ?

Last edited by atupi; 4th May 2012 at 04:00 PM.
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Old 4th May 2012, 04:01 PM   #539
Salas is offline Salas  Greece
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Leds orientation/health.
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Old 4th May 2012, 04:19 PM   #540
atupi is offline atupi  Romania
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Checked! Leds are fine and well positioned. On the working rail i have around 2v across 5 leds group and on the non working rail around 10v.

Think i've found the problem: some reading error conducted me to install IRFP9240 instead of IRFP240.

Last edited by atupi; 4th May 2012 at 04:30 PM.
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