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Old 13th February 2015, 01:38 PM   #1
carlmart is offline carlmart  Brazil
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Default Toggle switches

There's this 3 position switch toggle I will need to use to select between three gain options.

What I never remember is if that switch should be on-none-on, on-off-on or on-on-on.

I don't think the latter is necessary, because then the arrangement would be different. On-on-on switches are usually more expensive too.

The way it is, the "external" resistor will be in parallel with the other resistors when the switch is to the right or to the left, and set the gain when the switch is in the mid position.

Can someone remind me which is the one to use here?

Thanks.
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Old 13th February 2015, 03:43 PM   #2
jwilhelm is offline jwilhelm  Canada
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Quote:
Originally Posted by carlmart View Post
There's this 3 position switch toggle I will need to use to select between three gain options.

What I never remember is if that switch should be on-none-on, on-off-on or on-on-on.

I don't think the latter is necessary, because then the arrangement would be different. On-on-on switches are usually more expensive too.

The way it is, the "external" resistor will be in parallel with the other resistors when the switch is to the right or to the left, and set the gain when the switch is in the mid position.

Can someone remind me which is the one to use here?

Thanks.
You need On-Off-On.
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Old 13th February 2015, 03:47 PM   #3
AndrewT is offline AndrewT  Scotland
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Quote:
on-none-on, on-off-on
are essentially the same.
The middle position does not connect anything to the common pole.

You look for a switching arrangement that gives one of your gain setting when the common pole is not connected.

Then you have two alternative gain settings for when the switch is in either of the ON positions.
The switch could control relays. That gives you options on how the switch position controls the gain.
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Last edited by AndrewT; 13th February 2015 at 04:03 PM.
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Old 13th February 2015, 03:49 PM   #4
jwilhelm is offline jwilhelm  Canada
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Quote:
Originally Posted by AndrewT View Post
are essentially the same.
The middle position does not connect anything to the common pole.

You look far a switching arrangement that gives one of your gain setting when the common pole is not connected.

Then you have two alternative gain settings for when the switch is in either of the ON positions.
The switch could control relays. That gives you options on how the switch position controls the gain.
On-none-On has no center position so it won't work for this application.
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Old 13th February 2015, 03:56 PM   #5
AndrewT is offline AndrewT  Scotland
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none = no connection. It still describes a three position switch, ON - NONE - ON

One could substitute NO for none.

as in a two position switch/relay with NO - NC (normally open - normally closed)
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Old 13th February 2015, 03:58 PM   #6
jwilhelm is offline jwilhelm  Canada
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Quote:
Originally Posted by AndrewT View Post
none = no connection. It still describes a three position switch, ON - NONE - ON
None describe a non-existent position. DPDT with only two positions.
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Old 13th February 2015, 04:02 PM   #7
AndrewT is offline AndrewT  Scotland
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on - none - on
is not describing a two position switch.

Maybe it would be called a
ON - NO - ON
?
or would that be NC - NO - NC
?
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Last edited by AndrewT; 13th February 2015 at 04:05 PM.
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Old 13th February 2015, 04:05 PM   #8
jwilhelm is offline jwilhelm  Canada
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Quote:
Originally Posted by AndrewT View Post
on - none - on
is not describing a two position switch.
It is in any switch sold in North America. If there is a center position that is open to all connections it will be marked off. If it is maked none, the position doesn't exist.
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Old 13th February 2015, 04:11 PM   #9
AndrewT is offline AndrewT  Scotland
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if
ON - OFF - ON
is the sole standard for switch marking, then I am not familiar with it.
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Old 13th February 2015, 06:02 PM   #10
audiofan is offline audiofan  Canada
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Here is an attenuator with 3 steps 10db apart

If I remember well it is 3 - 13 - 23 db
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