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Grayhill 7 pole 20 position rotary switch
Grayhill 7 pole 20 position rotary switch
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Old 16th March 2004, 04:17 PM   #1
Bill Fitzpatrick is offline Bill Fitzpatrick  United States
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Default Grayhill 7 pole 20 position rotary switch

I have a few extra Grayhill 7 pole, 7 deck, 20 position, non-shorting rotary switches for sale at $25/ ea. These are Mil Spec sealed switches with a 1/4" flatted shaft. I can take paypal. Free ship to U.S. addresses.

The following diagram will allow the switche's use as a 20 step volume control.

http://www.kbacoustics.com/images/grayhill2.gif
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Old 16th March 2004, 04:22 PM   #2
BrianGT is offline BrianGT  United States
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Default Re: Grayhill 7 pole 20 position rotary switch

Quote:
Originally posted by Bill Fitzpatrick
I have a few extra Grayhill 7 pole, 7 deck, 20 position, non-shorting rotary switches for sale at $25/ ea. These are Mil Spec sealed switches with a 1/4" flatted shaft. I can take paypal. Free ship to U.S. addresses.

The following diagram will allow the switche's use as a 20 step volume control.

http://www.kbacoustics.com/images/grayhill2.gif
Since they are non-shorting, wouldn't they make a popping noise when changing volume control settings? (Great price, by the way!) Is there a solution to avoid the popping noises? My attenuator is making popping noises as I suspect that it isn't shorting.

Do you have any pictures of these items?

EDIT: nevermind, I found the old thread here:
http://www.diyaudio.com/forums/showt...&threadid=7528

You wrote earlier:
"The problem is that when the switch pole is in between positions and making contact with nothing, there is no shunt element in the circuit. The signal volume shoots up to maximum every time you rotate the switch one position."

Does the schematic that you posted a link to fully fix this problem?

--
Brian
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Old 16th March 2004, 04:48 PM   #3
Bill Fitzpatrick is offline Bill Fitzpatrick  United States
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Default Re: Re: Grayhill 7 pole 20 position rotary switch

Quote:
Originally posted by BrianGT


Since they are non-shorting, wouldn't they make a popping noise when changing volume control settings? (Great price, by the way!) Is there a solution to avoid the popping noises? My attenuator is making popping noises as I suspect that it isn't shorting.

Do you have any pictures of these items?

EDIT: nevermind, I found the old thread here:
http://www.diyaudio.com/forums/showt...&threadid=7528

You wrote earlier:
"The problem is that when the switch pole is in between positions and making contact with nothing, there is no shunt element in the circuit. The signal volume shoots up to maximum every time you rotate the switch one position."

Does the schematic that you posted a link to fully fix this problem?

--
Brian
The posted schematic will prevent the output shooting to max in between positions. Actually the output shoots to min with this wiring. As to popping, keep DC off the switch and it may help to add a resistor to ground at the output.
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Old 16th March 2004, 07:52 PM   #4
Bas Horneman is offline Bas Horneman  Netherlands
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Can anyone point me to a schematic with values?

Please
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Old 17th March 2004, 04:06 AM   #5
Bill Fitzpatrick is offline Bill Fitzpatrick  United States
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Still a few left.
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Old 17th March 2004, 05:58 AM   #6
CH2 is offline CH2
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Hi


I would like to know if you ship to Singapore(some where in Asia)?

Do you accept PayPal?


CH2
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Old 17th March 2004, 04:03 PM   #7
Bill Fitzpatrick is offline Bill Fitzpatrick  United States
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I can do that. email me.
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Old 20th March 2004, 05:54 PM   #8
Bill Fitzpatrick is offline Bill Fitzpatrick  United States
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I have one of these switches left. email if interested.
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Old 21st March 2004, 12:11 AM   #9
Bill Fitzpatrick is offline Bill Fitzpatrick  United States
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Almost last call on this remaining switch.
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Old 21st March 2004, 11:56 AM   #10
Bill Fitzpatrick is offline Bill Fitzpatrick  United States
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Found another switch. Now there are 2 available.
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