Salas hotrodded blue DCB1 build - Page 215 - diyAudio
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Old 17th August 2012, 03:02 PM   #2141
BigE is offline BigE  Canada
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80 va for BOTH?
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Old 17th August 2012, 03:53 PM   #2142
Salas is online now Salas  Greece
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Quote:
Originally Posted by atupi View Post
Salas, if i want to adapt the power supply used in DCB1 for +/- 5V what changes i need to do ? The source used in RIAA preamp seem a bit simpler but is as effective as this one used in DCB1 ?
Sorry if i am a but offtopic but lost between your threads.

Adrian
You should use 2 leds and a diode instead of 5 leds and it will give you 5V if you must, but BIB is better for a general reg.
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Old 17th August 2012, 11:13 PM   #2143
mjock3 is offline mjock3  United States
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Originally Posted by Erlend Sæterdal View Post
It is possible to increase gain in the NCORE. Just read the manual.
Erlend,

Could you tell me where it talks about that? I don't see it. Also what would be the possible ramifications?
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Old 19th August 2012, 01:05 AM   #2144
mjock3 is offline mjock3  United States
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Default DCB1

Happy to report I have hooked it up to my second system and it is now statring the burn in process. Sounding pretty darn nice.

After burn in I will bring it in and take a listen on my main system. Then more than likely go to 600ma or more and upgrade to TX resistors. And report back.

At that point I will put in enclosure.

Nice project! Thanks Salas and Tea Bag
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Old 22nd August 2012, 10:25 PM   #2145
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Uh-oh. Just put together a dcb1 after a long hiatus. All was good at ~600mA. Went for 1A and bypass cap change and now lost both 5 led strings and getting -5.31v and +.4v when checking offset!!!
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Old 22nd August 2012, 10:43 PM   #2146
Salas is online now Salas  Greece
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Check the output Mosfets.
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Old 23rd August 2012, 12:46 AM   #2147
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Quote:
Originally Posted by Salas View Post
Check the output Mosfets.
On the 9140,140 closest to current limiting resistors I get 3.6v and 4v. The other two, I get 0v (checking 1st and 3rd pins, which should be G,S correct?).
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Old 23rd August 2012, 01:04 AM   #2148
Salas is online now Salas  Greece
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Yep, 0V Vgs is bad news. Did the sinking get too hot while trying for 1A and then died, or something must have happened during rework?
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Old 23rd August 2012, 01:13 AM   #2149
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Not sure. What caught me first was a slight smell of burning after about 30 seconds. I actually got a few seconds of music then it cut out and that's when I checked and saw the leds were out. I did discover afterwards some of the fets had become a little loose - the bolts needing more tightening.

Which fets need replacing?
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Old 23rd August 2012, 01:35 AM   #2150
Salas is online now Salas  Greece
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Those with 0Vgs towards the audio part of the board nearer to 5 Leds each. Use thermal paste and check them well for good insulation pads and good but not overt tightness.
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