Building a symmetrical psu B1 buffer - Page 118

ra7 · 22nd March 2010, 05:47 PM

Salas, which $10 stepped one are you referring to?

regiregi22 · 22nd March 2010, 05:59 PM

Quote:

Originally Posted by ra7

Salas, which $10 stepped one are you referring to?

This one:

DACT Type 21 Stepped Attenuator 20K FOR PASS B1 DIY - eBay (item 120502791204 end time Apr-05-10 10:17:39 PDT)

sutantoroy · 23rd March 2010, 02:58 AM

Hi Salas,

I just wondering, is it a good idea to put another buffer in front of potentiometer/step attenuator?

Salas · 23rd March 2010, 03:21 AM

No, not in my opinion.

sutantoroy · 23rd March 2010, 05:18 AM

Why?

Too many parts will destructs the original audio signal or else?

Salas · 23rd March 2010, 05:54 AM

If your source has under 2k output impedance, it can drive the 20k pot. More non needed circuitry isn't good economy neither for the pocket nor for the resolution.

samoloko · 23rd March 2010, 06:59 AM

Ebay 20 K pot from above ebay link Is very Interesting
anyone tried It
are resistors good

regiregi22 · 23rd March 2010, 08:33 AM

Quote:

Originally Posted by samoloko

Ebay 20 K pot from above ebay link Is very Interesting
anyone tried It
are resistors good

I haven't tried it yet but I am thinking in ordering one. Don't know about resistor's quality, I wouldn't expect them to be high-end, just plain standard resistors. But for that price, it's difficult not to try it.

dantwomey · 11:41 AM

Quote:

Originally Posted by regiregi22

I haven't tried it yet but I am thinking in ordering one. Don't know about resistor's quality, I wouldn't expect them to be high-end, just plain standard resistors. But for that price, it's difficult not to try it.

I've ordered one and intend on using it while I work on a LightSpeed volume control. I'm eventually going to try and make the LS/buffer combination remote controlled by using something like this:

ALPS Quad Potentiometer RK27114MC motorized pot 10K 50K

Or one of these might work well too,

ALPS 25K Motorized Potentiometer

Regards,
Dan

Zigis · 23rd March 2010, 12:12 PM

Quote:

Originally Posted by samoloko

Ebay 20 K pot from above ebay link Is very Interesting
anyone tried It
are resistors good

Almost any resistors are much better than any high end pot with slide contact.
More important question is - how good are switch/ contacts, and how long it works in good quality.

Some time ago here was talk about Chinesian pots, look like blue alps, but stepped inside. Normal resistors, but switch was - PCB with slide contact, I don't think it may last long in normal quality.

Anyone opened this Ebay pot?

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22nd March 2010, 05:47 PM	#1171
ra7 diyAudio Member Join Date: Feb 2009 Blog Entries: 1	Salas, which $10 stepped one are you referring to?

23rd March 2010, 02:58 AM	#1173
sutantoroy diyAudio Member Join Date: Dec 2008	Hi Salas, I just wondering, is it a good idea to put another buffer in front of potentiometer/step attenuator?

23rd March 2010, 03:21 AM	#1174
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	No, not in my opinion.

23rd March 2010, 05:18 AM	#1175
sutantoroy diyAudio Member Join Date: Dec 2008	Why? Too many parts will destructs the original audio signal or else?

23rd March 2010, 05:54 AM	#1176
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	If your source has under 2k output impedance, it can drive the 20k pot. More non needed circuitry isn't good economy neither for the pocket nor for the resolution.

23rd March 2010, 06:59 AM	#1177
samoloko diyAudio Member Join Date: Jun 2006	Ebay 20 K pot from above ebay link Is very Interesting anyone tried It are resistors good

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