Low-cost, easy ALPS stepped attenuator
Oct 20, 2004 at 5:06 AM Post #16 of 70
jnewman,

Yes they are linear. but with 10 total turns you still have reasonable
control. Not like trying to use a single-turn linear pot. And there's
always log faking.

Like I said, a little inconvenient, but I was asking about sonics, not
convenience.
 
Oct 22, 2004 at 10:33 PM Post #18 of 70
8266AlpsStppdAttntr_01.jpg


Yes, it's a biggun alright.

Not exactly sure where to start.
I suppose I should figure out which resistors to get.

Oh, is it easier to solder the resistors ont he boards first, or after soldering it to the attenuator?

-Ed
 
Oct 22, 2004 at 11:50 PM Post #20 of 70
The only logical way i can think of it would be soldier the resistors on and solder the board on afterwards. That's prob why the boards come separate anywa.
 
Oct 23, 2004 at 12:20 AM Post #21 of 70
Quote:

Originally Posted by Garbz
The only logical way i can think of it would be soldier the resistors on and solder the board on afterwards. That's prob why the boards come separate anywa.


LOL, duh. How would I get solder the "legs" on the other side of the board.

Thanks for keeping me from making another stupid mistake.
tongue.gif


-Ed
 
Oct 23, 2004 at 1:52 AM Post #22 of 70
Edwood --

Solder faster! We want to know how well it works
smily_headphones1.gif
 
Oct 24, 2004 at 2:43 AM Post #24 of 70
Hehe, fine fine then, have it your way
smily_headphones1.gif


Joking aside, I'm very interested in hearing your impressions on this. I saw this attenuator a few months ago while I was collecting parts for my PPA, but opted for a standard Blue Velvet since I couldn't find anyone who'd tried it before.
 
Oct 28, 2004 at 3:13 PM Post #25 of 70
I ordered the Triode Part and the resistors from Mouser. In addition, I tried to find more information regarding the assembly, but it appears that there is little reference to an ALPS switch or Attenuator ("they don't make stepped attenuators"-someone said) my questions are:

1
Mouser Values (Ohm)
71-RN60D-F-9.31K9310
71-RN60D-F-7.68K7680
71-RN60D-F-6.19K6190
71-RN60D-F-4.99K4990
71-RN60D-F-4.12K4120
71-RN60D-F-3.32K3300
71-RN60D-F-2.74K2740
71-RN60D-F-2.15K2150
71-RN60D-F-1.74K1740
71-RN60D-F-1.5K1500
71-RN60D-F-1.2K1200
71-RN60D-F-953953
71-RN60D-F-1.4K1400
71-RN60D-F-909909
71-RN60D-F-604604
71-RN60D-F-402390
71-RN60D-F-274274
71-RN60D-F-182182
71-RN60D-F-158158
71-RN60D-F-90.990.9
71-RN60D-F-47.547.5
71-RN60D-F-24.924.9

These values are based on the Triode referenced 3-tier values. Any problems?

2. Is there any more information on the "Alps Attenuator" out there?
3. I have never assembled a stepped attenuator before. Are there assembly tips out there for this type of part (2 circuit boards?)
4. I am thinking of using this with a Pimeta board.

Thank you in advance.
smily_headphones1.gif
 
Oct 28, 2004 at 4:13 PM Post #27 of 70
Quote:

Originally Posted by Edwood
Yes, it's a biggun alright.


Holy geez that's huge!
Granted I've never seen a stepped attenuator before, but I didn't think they were that ginormous. I thought it would be about half or at most 2/3 as big as it actually is.
 
Oct 28, 2004 at 6:05 PM Post #28 of 70
Quote:

Originally Posted by aerius
Holy geez that's huge!
Granted I've never seen a stepped attenuator before, but I didn't think they were that ginormous. I thought it would be about half or at most 2/3 as big as it actually is.


They can be a lot smaller than this one.
 
Nov 3, 2004 at 12:25 AM Post #30 of 70
Quote:

Anyone have a guide to populating and wiring this thing?


lol.
I was thinking the same thing.

I spent some time late this morning ohming it out and I think I got a good idea but....
 
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