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-   -   Grayhill 7pole 20 position rotary (http://www.diyaudio.com/forums/swap-meet/7528-grayhill-7pole-20-position-rotary.html)

Bill Fitzpatrick 11th November 2002 10:06 PM

Grayhill 7pole 20 position rotary
 
I have a few extra Grayhill 7 pole, 7 deck, 20 position rotary switches for sale at $25/ea.These are Mil Spec sealed switches with a 1/4" flatted shaft. I can take paypal. Add $3 for US shipping.

jwb 11th November 2002 11:20 PM

Is this a shorting or non-shorting switch?

Bill Fitzpatrick 12th November 2002 01:07 AM

2 Attachment(s)
It's non shorting. They are brand new. Switches like these are well over $100 in the distributors catalogs.

I tried to attach an image before but it didn't take.

BrianGT 12th November 2002 04:25 AM

will you take paypal?

--
Brian

Peter Daniel 12th November 2002 05:19 AM

What could they be used for, if they are non shorting?

BrianGT 12th November 2002 05:28 AM

does non-shorting just means that it breaks connection before changing to the next switch setting, in comparison to shorting, which connects before disconnecting. Is this correct? So, non-shorting switches create a bad "pop" when channels, right? Is there anyway to avoid this problem?

--
Brian

Peter Daniel 12th November 2002 05:39 AM

Shorting switches are used for volume control, and when changing level you would get uninterupted signal without pops.

Non-shorting switch can't be used as a shunt element in volume control, because it brakes to ground connection and ea. time it creates maximum signal level.

I imagine the only way to change it for shorting type switch is to change the wiper. But there are 7 of them and it's almost watch makers precision job.;)

Nevertheless, those are fine switches and I'm seriously considering getting one for myself.

Bill Fitzpatrick 14th November 2002 11:06 PM

Just a few of these switches left. If you want one, now's the time.

BrianGT 18th November 2002 10:58 PM

Quote:

Originally posted by Peter Daniel
Shorting switches are used for volume control, and when changing level you would get uninterupted signal without pops.

Non-shorting switch can't be used as a shunt element in volume control, because it brakes to ground connection and ea. time it creates maximum signal level.


Could you just wire the ground connection to the switch differently to get rid of this problem? You would still get an interrupted signal, but you could get rid of the pops. You could tie the ground to the lowest volume level of the switch. Would this work?

--
Brian

Bill Fitzpatrick 19th November 2002 01:50 AM

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.

It is possible to switch the series resistance, as opposed to the shunt resistance but many purists would be aghast at this idea because it put all the resistors and as many solder joints directly in the signal path, so they say. They do forget, however, that if this were a shorting switch using the typical configuration, all the resistors and solder joints are still in the signal path.

Whoever it was that first said than a shunt to ground is not in the signal path has been watching too much television.


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