Building a symmetrical psu B1 buffer - Page 177

regiregi22 · 13th July 2010, 12:12 PM

I am doing my best in trying to find an offensive post in this last page of the thread, but I am not able

Regards
Regi

Salas · 13th July 2010, 12:16 PM

Do something practical then.

Keep your amp on, and switch on/off your DCB1 so we know if you get the hum by any chance. In my system I tried. Niet.

ernesternest · 13th July 2010, 12:24 PM

If I do this, I get hum.

Ernst

Salas · 13th July 2010, 12:31 PM

What amp you got? Zin? Loud hum?

P.S. There was another way posted by Oenboek. He wanted no relay contact so he did an easy change and used the relay to ground short instead.

''I bypassed the delay relais as I don't want this contact in the loop. I use the relais to ground the signal. This is a very easy change on the PCB. Just connect the 2 unused pins of the relais-switches to the ground, and link the middle and output pins of the switches together (by channel off-course).''

So you can try that (thanks to Oenboek), for anybody who gets the thing or just feels better losing yet another signal path contact, or whatever Andrew may suggest if he will be so kind. Sorry I can't tell more since I don't get the issue so to experiment on it.

Malka07 · 13th July 2010, 01:02 PM

I also get this Hum(more like a buzz on mine) when i shut my dcb1 off and the power amp is still on. My poweramp is a tubeamp and has a 1meg Zin.
I get around this simply by switching off my poweramp before i turn off the dcb1.

Alon

Salas · 13th July 2010, 01:04 PM

Is it a loud thing?

Malka07 · 13th July 2010, 01:08 PM

Not extremely loud...but loud enough to want to quickly turn off the poweramp.

Salas · 13th July 2010, 01:10 PM

Wanna beta test the Oenboek's grounded cross? Maybe it has a quality notch side benefit by skipping the contact too. The photo is tell tale.

Malka07 · 13th July 2010, 01:17 PM

Ok Salas i'll try it when i get some time

I have soo many projects on right now...

Salas · 13th July 2010, 01:21 PM

OK, official grounded cross beta tester then when not having anything better to do.

13th July 2010, 12:12 PM	#1761
regiregi22 diyAudio Member Join Date: May 2009 Location: Madrid (Spain)	I am doing my best in trying to find an offensive post in this last page of the thread, but I am not able Regards Regi __________________ diyAudio, doing it as big as you can, JUST BECAUSE WE CAN!

13th July 2010, 12:24 PM	#1763
ernesternest diyAudio Member Join Date: Oct 2007 Location: Cologne	Hum If I do this, I get hum. Ernst

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13th July 2010, 12:16 PM	#1762
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Do something practical then. Keep your amp on, and switch on/off your DCB1 so we know if you get the hum by any chance. In my system I tried. Niet.

13th July 2010, 01:02 PM	#1765
Malka07 diyAudio Member Join Date: Mar 2009	I also get this Hum(more like a buzz on mine) when i shut my dcb1 off and the power amp is still on. My poweramp is a tubeamp and has a 1meg Zin. I get around this simply by switching off my poweramp before i turn off the dcb1. Alon

13th July 2010, 01:04 PM	#1766
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Is it a loud thing?

13th July 2010, 01:08 PM	#1767
Malka07 diyAudio Member Join Date: Mar 2009	Not extremely loud...but loud enough to want to quickly turn off the poweramp.

13th July 2010, 01:10 PM	#1768
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Wanna beta test the Oenboek's grounded cross? Maybe it has a quality notch side benefit by skipping the contact too. The photo is tell tale.

13th July 2010, 01:17 PM	#1769
Malka07 diyAudio Member Join Date: Mar 2009	Ok Salas i'll try it when i get some time I have soo many projects on right now...