Salas hotrodded blue DCB1 build - Page 210 - diyAudio
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Old 13th August 2012, 01:00 PM   #2091
Salas is offline Salas  Greece
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There is no reason losing the Vref for just tasting termination capacitors. Some mishap must have occurred during ''operations''. See if the JFETs at the 5 LEDS tails are intact also. Is your iron showing ~0 Ohm from tip to its mains earth prong? Is it static safe in other words? Check for live Vbe, Vgs, everything semi.
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Old 13th August 2012, 01:31 PM   #2092
suburra is offline suburra  Italy
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Salas

My solder station it's "static safe"
I'll check all the semiconductors and report

many thanks

Marco

ps

the 2 mosfets near 100uF capacitors, remain cool by turning on the unit...
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Old 13th August 2012, 02:06 PM   #2093
Salas is offline Salas  Greece
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See if they show Vgs.
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Old 14th August 2012, 02:00 AM   #2094
jeff517 is offline jeff517  United States
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OK folks, I'm ready to put some power to this thing. I have an ANTEK 50Va by 12v x 2 torroidal transformer. 2 red, 2 black and 1 purple wires on 120v side. And 2 green and 2 blue wires on 12v side. Do I wire mains(120 side) in parallel, and same on 12v side?
Too many wires and I would really like to not toast this board up.Suggestions?

Last edited by jeff517; 14th August 2012 at 02:06 AM.
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Old 14th August 2012, 02:04 AM   #2095
jeff517 is offline jeff517  United States
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http://www.antekinc.com/pdf/AS-0512.pdf

This is what the manufacturer s site has as far as help.
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Old 14th August 2012, 03:18 AM   #2096
Salas is offline Salas  Greece
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Secondaries to DCB1's transformer connector marked AC IN as shown. Primaries in parallel for USA mains. Purple magnetic shield wire bolts with the mains ground wire to chassis.
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File Type: jpg Antk.jpg (115.0 KB, 378 views)
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Old 14th August 2012, 11:13 AM   #2097
AndrewT is offline AndrewT  Scotland
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and use a bulb tester for the power up.
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regards Andrew T.
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Old 14th August 2012, 08:47 PM   #2098
jeff517 is offline jeff517  United States
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Thank you all for your patience and help.
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Old 15th August 2012, 02:27 PM   #2099
atupi is offline atupi  Romania
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I want to install my DCB1 buffer into a metal case. It's ok to connect the case to the GND of pcb ? I'm using isolated RCA connectors.
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Old 15th August 2012, 02:40 PM   #2100
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Default A couple more newbie DCB1 questions.......

My DCB1 is working fine, but I have a few questions.....

I'm running 10 ohm R's (200ma config) with two separate 60VA 12V single secondary transformers (so 120VA total). My DC output voltages are +10.04 and -10.11 and the unloaded transformer voltages are about 13.2VDC. I understand that for most of the various hot rod configs at least 15VDC/50VA is recommended. How do I test/verify that I have enough voltage headroom with my transformers? Should I measure the DC output voltage stability with a 5K or 10K load on the outputs at full input signal?

I'm also measuring 2V across the 10R on the IRFP240 side and 1.75V across the 10R on the 9240 side, so 200ma and 175ma. I understand this is the quiescent current for the shunt part of the PS.

Is it normal to have 25ma different between the + and - sides? I am assuming that it is, and is probably no big deal.
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