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Author Topic: A question about centre-off switch application...  (Read 2201 times)

KitShunt

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A question about centre-off switch application...
« on: July 26, 2011, 03:17:07 PM »

Hi there all.

As the title suggests, I'm having trouble working out if I can use an on-off-on switch in a project I'm working on.

What I'm attempting to do is switch between 3 signals: HP filtered, dry and LP filtered, instead of using a tone control pot at the output stage of a distortion unit, as the pot gives me a massive reduction in volume around the centre. (it's basically the big muff tone circuit).

Is it possible to switch between the 3 using an spdt centre-off toggle?

To be honest trying to figure this out is doing my nut in!

Cheers in advance,
James
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Circuitbenders

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Re: A question about centre-off switch application...
« Reply #1 on: July 26, 2011, 03:35:31 PM »

if i'm understanding you correctly, you can't use an on-off-on switch for this. The clue is in the name i.e. in the centre off position nothing is connected so it won't act as a bypass, or dry connection. You probably need a rotary switch with at least 3 poles for this.
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KitShunt

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Re: A question about centre-off switch application...
« Reply #2 on: July 26, 2011, 03:43:42 PM »

Yep as I suspected.

Just remembered doing the 101 LFO extender mod using a centre-off to switch between the 3 speed settings, and was hoping that I could apply the same principle to this bit of kit, ah well rotary it is then.

Alternatively, if you could suggest a way of eliminating the massive mid-range level drop as the tone control sweeps, I'd be happy to just use a pot!

Cheers mate, have a good one!
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Circuitbenders

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Re: A question about centre-off switch application...
« Reply #3 on: July 26, 2011, 04:19:30 PM »

I think that might be the point of the big muff tone control, it is designed to create a scooped mid distortion sound for a guitar after all.
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KitShunt

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Re: A question about centre-off switch application...
« Reply #4 on: July 26, 2011, 04:35:23 PM »

That is a fair point!
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