Salas hotrodded blue DCB1 build - Page 210

Salas · 13th August 2012, 01:00 PM

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.

suburra · 13th August 2012, 01:31 PM

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...

Salas · 13th August 2012, 02:06 PM

See if they show Vgs.

jeff517 · 02:06 AM

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?

jeff517 · 14th August 2012, 02:04 AM

http://www.antekinc.com/pdf/AS-0512.pdf

This is what the manufacturer s site has as far as help.

Salas · 14th August 2012, 03:18 AM

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.

AndrewT · 14th August 2012, 11:13 AM

and use a bulb tester for the power up.

jeff517 · 14th August 2012, 08:47 PM

Thank you all for your patience and help.

atupi · 15th August 2012, 02:27 PM

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.

boywonder · 15th August 2012, 02:40 PM

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.

14th August 2012, 02:00 AM	#2094
jeff517 diyAudio Member Join Date: Mar 2012 Location: Traverse City MI.	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.

15th August 2012, 02:40 PM	#2100
boywonder diyAudio Member Join Date: Jan 2008 Location: So.Cal.	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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13th August 2012, 01:00 PM	#2091
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	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.

13th August 2012, 01:31 PM	#2092
suburra diyAudio Member Join Date: Aug 2009	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...

13th August 2012, 02:06 PM	#2093
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	See if they show Vgs.

14th August 2012, 02:04 AM	#2095
jeff517 diyAudio Member Join Date: Mar 2012 Location: Traverse City MI.	http://www.antekinc.com/pdf/AS-0512.pdf This is what the manufacturer s site has as far as help.

14th August 2012, 11:13 AM	#2097
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	and use a bulb tester for the power up.

14th August 2012, 08:47 PM	#2098
jeff517 diyAudio Member Join Date: Mar 2012 Location: Traverse City MI.	Thank you all for your patience and help.

15th August 2012, 02:27 PM	#2099
atupi diyAudio Member Join Date: Oct 2010 Location: Bucharest	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.