Found: source for cheap ladder attenuators

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kyc

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Joined 2003
cgi6.tw.ebay.com/ws/eBayISAPI.dll?ViewSellersOtherItems&userid=kyc111&include=0&s
24 Stepped switch

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<IMG SRC="http://tw.image.bid.yahoo.com/users/0/6/6/8/kyc_111-img464x525-1068937182dsc00006-2.jpg"><br>
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GAPrior

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Joined 2003
Hard stop or continuous revolution?

I saw something in the construction manual about using only 23 of the 24 positions so it won't have a 'full-revolution' design. Does anyone know if there is a hard stop at minimum volume to keep you from going past minimum to the maximum position (going directly from position 1 to position 24/23)?

-Greg
 
uvodee

uvodee

Member
Joined 2002
"Does anyone know if there is a hard stop at minimum volume to keep you from going past minimum to the maximum position (going directly from position 1 to position 24/23)?"


Personally I would not mind, I could probably make a mechanical stop however I think these are full rotary selectors without any dead stop...

I hope I am wrong but some year ago I saw similar rotary switches that were actually made for pc use being sold as readdy to assemble attenuators with the resistors in HK (very very cheap in store)

J-P
 
J

jcsveth

Member
Joined 2002
For info, I bought one of the EBay ones and received it in just over a week from Tawain. The build is excellent - it is certainly as good if not better than the picture. I know that given enough time and patience, I could solder one up reasonably well but I do not think I could come close to the quality of this work - it looks like it was done on a jig. I haven't tested it yet but if it sounds as good as it looks, I will be ordering more.
(No, I do not know the seller nor have I even communicated with him).
 
fdegrove

fdegrove

diyAudio Senior Member
Joined 2002
Hi,

"Does anyone know if there is a hard stop at minimum volume to keep you from going past minimum to the maximum position (going directly from position 1 to position 24/23)?"
Click to expand...

The rotary switches used to build those attenuators are nominally 24 make before break pos. switches.

You give up position #24 by putting a mechanical stop there, often just a small blocking screw.
I don't think there's a way to have all 24 pos. and have a stop at the same time...

Not having a stop there would be risky as you could go from dead quiet to full blast by just one click.:D

Cheers, ;)
 
fdegrove

fdegrove

diyAudio Senior Member
Joined 2002
RE: I WAS THINKING.

Hi,

of a mechanical soultion something that prevents the KNOB from turning, so a deadstop, a small pin or so, attache to the bottom of the knob not visible from the front...
Click to expand...

Sure, that's what that little screw does.
The problem is that you don't have enough space to put anything on these ELMA switches.

Cheers,;)
 
fdegrove

fdegrove

diyAudio Senior Member
Joined 2002
Hi,

of a mechanical soultion something that prevents the KNOB from turning, so a deadstop, a small pin or so, attache to the bottom of the knob not visible from the front...
Click to expand...

Ah,ah...I see what you mean now: on the dial side, right?

That's a possibility but for all practical purposes I find 23 pos. more than I ever need.

At home I have attenuator usually set between ps. 9 and 11.

If you use a switch to mute the preamp then you could consider that infinite att. and pos. -24 if you like.

Cheers,;)
 
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