Mezmerize DCB1 Building Thread - Page 70

McQuaide · 26th January 2013, 05:54 PM

Hi all,

I was doing some checks prior to firing up my Mesmerize and I noticed that the outputs are shorted to ground. It seems as though the relay on the outputs is closed. The three inner sets of pins on the relay have continuity. None of the input relays are like this. Is this normal? I've gone over the board looking for shorts and can't find any.

Thanks,

Mark

Salas · 26th January 2013, 05:58 PM

When off its shorting the output to ground. When on it restores signal line continuity.

McQuaide · 26th January 2013, 08:49 PM

Cool, thanks.

kop89 · 28th January 2013, 07:04 PM

Would there be any ill effect if I use IRFP244 instead of IRFP240?

Salas · 28th January 2013, 08:48 PM

Theoretically no. But I haven't used it.

levistubby · 9th February 2013, 01:13 PM

Matched 2SK170-BL pairs

Hi Guys, I've been a forum member for about a year and a half but have been a bit low profile so far.

I've just finished a Gainclone using boards from Brian GT and have now embarked on a Mezmerise. Can anyone point me to a UK/EU source for matched 2SK170-BL pairs? (Andrew T maybe?). Thanks.

Marra · 9th February 2013, 02:18 PM

AndrewT supplied me with sets for the DCB1 a while back but whether he still does I'm not sure.Best bet would be to pm him.
Failing that Spencer is a good guy to deal with and supplies well matched fets and delivery is usually pretty quick.

Store | FET Audio

Rush · 9th February 2013, 05:49 PM

I was wondering about using IRFP044N for the positive regulator and doing an upside down positive reg for the negative side. I want to use the IRFP044N due to the current they pass or should I just do a cap multiplier like Juma uses?
+/-+/-

Rush

Salas · 9th February 2013, 05:56 PM

Use a multiplier, its going to be a very hot reg if shunt for F5. Has to cater for PEAK current plus margin. You can see how to use NMOS for positive in SSHV1 & 2.

Skauneboy · 10th February 2013, 04:17 PM

I'm using an R-Core transformer from diyclub and am wondering how the secondaries should be twisted together, if at all.

The model I have is R26-34 with 9V and 15V secondaries. Each secondary has four wires, 2x blue and 2x grey for 15V. As I understand it I should connect one blue and one grey wire together to create a 0V center tap. Should I twist these together? Or do I twist each color seperately and simply connect the blue and grey together at the PCB?

--------- 1x blue
xxxxxxx 1x blue + 1x grey
--------- 1x grey

xxxxxxx 2x blue
>1x blue + 1x grey
xxxxxxx 2x grey

Also, for the primaries, is it beneficial to twist the hot and neutral wire together?

28th January 2013, 07:04 PM	#694
kop89 diyAudio Member Join Date: Feb 2008	IRFP244 instead of IRFP240? Would there be any ill effect if I use IRFP244 instead of IRFP240?

9th February 2013, 05:49 PM	#698
Rush diyAudio Member Join Date: Sep 2009 Location: Tampa, Florida	Looking to regulate a class "A" power amp, F5 I was wondering about using IRFP044N for the positive regulator and doing an upside down positive reg for the negative side. I want to use the IRFP044N due to the current they pass or should I just do a cap multiplier like Juma uses? +/-+/- Rush

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26th January 2013, 05:54 PM	#691
McQuaide diyAudio Member Join Date: Jan 2011 Location: Southeastern Pennsylvania	Hi all, I was doing some checks prior to firing up my Mesmerize and I noticed that the outputs are shorted to ground. It seems as though the relay on the outputs is closed. The three inner sets of pins on the relay have continuity. None of the input relays are like this. Is this normal? I've gone over the board looking for shorts and can't find any. Thanks, Mark

26th January 2013, 05:58 PM	#692
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	When off its shorting the output to ground. When on it restores signal line continuity.

26th January 2013, 08:49 PM	#693
McQuaide diyAudio Member Join Date: Jan 2011 Location: Southeastern Pennsylvania	Cool, thanks.

28th January 2013, 08:48 PM	#695
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Theoretically no. But I haven't used it.

9th February 2013, 01:13 PM	#696
levistubby diyAudio Member Join Date: May 2011 Location: Hampshire coast UK	Matched 2SK170-BL pairs Hi Guys, I've been a forum member for about a year and a half but have been a bit low profile so far. I've just finished a Gainclone using boards from Brian GT and have now embarked on a Mezmerise. Can anyone point me to a UK/EU source for matched 2SK170-BL pairs? (Andrew T maybe?). Thanks.

9th February 2013, 02:18 PM	#697
Marra diyAudio Member Join Date: Nov 2009 Location: Near Lincoln	AndrewT supplied me with sets for the DCB1 a while back but whether he still does I'm not sure.Best bet would be to pm him. Failing that Spencer is a good guy to deal with and supplies well matched fets and delivery is usually pretty quick. Store \| FET Audio

9th February 2013, 05:56 PM	#699
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Use a multiplier, its going to be a very hot reg if shunt for F5. Has to cater for PEAK current plus margin. You can see how to use NMOS for positive in SSHV1 & 2.

10th February 2013, 04:17 PM	#700
Skauneboy diyAudio Member Join Date: Sep 2009	I'm using an R-Core transformer from diyclub and am wondering how the secondaries should be twisted together, if at all. The model I have is R26-34 with 9V and 15V secondaries. Each secondary has four wires, 2x blue and 2x grey for 15V. As I understand it I should connect one blue and one grey wire together to create a 0V center tap. Should I twist these together? Or do I twist each color seperately and simply connect the blue and grey together at the PCB? --------- 1x blue xxxxxxx 1x blue + 1x grey --------- 1x grey xxxxxxx 2x blue >1x blue + 1x grey xxxxxxx 2x grey Also, for the primaries, is it beneficial to twist the hot and neutral wire together?