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Old 16th April 2012, 10:01 AM   #1
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Default Poles and throws?

I am putting together a volume buffer and source selector.
However, I am utterly confused as to what switch I need. I want to be ablee to have 3 inputs.
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Old 16th April 2012, 10:06 AM   #2
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Originally Posted by MagnumOpus View Post
I am putting together a volume buffer and source selector.
However, I am utterly confused as to what switch I need. I want to be able to have 3 inputs.
If you want to switch three signals you need three poles.
Assuming you want to use a rotary switch, it should of course have three positions, which means you need three throws. However, with rotary switches you normally don't talk about throws but about psositions. What you need is a three-pole, three-pos switch.

If you have rocker or tumbler switches you talk about throws. A tumbler with an on and an off position is a single throw, with one on and another on position it is double throw.

hope this helps,

jan didden
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Old 16th April 2012, 10:56 AM   #3
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Looking at the schematic symbols for various switches might help shed some light also.

3 inputs that you can select from?
I assume this is 2 channel (stereo)?
Then you'd need 2 poles,with 3 throws. (DP3T)
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Old 16th April 2012, 10:58 AM   #4
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Originally Posted by DigitalJunkie View Post
Looking at the schematic symbols for various switches might help shed some light also.

3 inputs that you can select from?
I assume this is 2 channel (stereo)?
Then you'd need 2 poles,with 3 throws. (DP3T)
You're right, I had it wrong. Sorry.

jan
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Old 16th April 2012, 12:10 PM   #5
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So either a dobbelpole trippel throw rocker switch or a dobbel pole 3 position rotary.

Thank you very much!
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Old 16th April 2012, 12:33 PM   #6
AndrewT is offline AndrewT  Scotland
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Triple throw rocker would be very unusual. You can buy triple position rocker with a centre detent. But inside there are only two active connections.
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Old 16th April 2012, 01:07 PM   #7
sreten is offline sreten  United Kingdom
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Hi,

You might find that the basic rotary switch available is 4 pole 3 way,
(other versions being 1 Pole 12 way, 2 Pole 6 way, 3 pole 4 way).

Just double up the connections.

rgds, sreten.
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Old 16th April 2012, 01:15 PM   #8
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Originally Posted by sreten View Post
Hi,

You might find that the basic rotary switch available is 4 pole 3 way,
(other versions being 1 Pole 12 way, 2 Pole 6 way, 3 pole 4 way).

Just double up the connections.

rgds, sreten.
How do mean? Double up the connections?
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Old 16th April 2012, 01:50 PM   #9
DF96 is online now DF96  England
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Wire two sections in parallel. Not really necessary as it would be simpler to just ignore unwanted poles, but you halve contact resistance (and double stray capacitance).
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Old 16th April 2012, 03:12 PM   #10
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Am thinkin of just this thing myself.

can someone post a link to a 3 position stereo knob i can buy?
I cant seem to find them anywhere.
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