Help me wire a simple SPDT switch

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Old 04-09-18, 01:57 PM
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Help me wire a simple SPDT switch

I've done a ton of searching, but I've yet to find any diagram that I can understand showing the ground wires and everything so that I can really understand what I'm doing. So I made my own graphic. I have two power sources (really just one rechargeable battery that can simultaneously output 24v and 12v) and want to be able to switch in between the two. They'll be driving an amp that will sound best at 24v, but won't last as long with regards to battery life, so it would be nice if I could just switch between the two as the situation warrants. Here's my limited understanding in one simple diagram.



Anybody care to straighten me out?

Thanks!
 
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Old 04-09-18, 02:06 PM
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You've got the general idea. The grounds are connected together and not switched.
You just switch the positives with a SPDT switch.... like shown.

Been in pro sound for 40 years.... not sure what you are doing with two supplies.
 
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Old 04-09-18, 03:46 PM
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Thanks Pete. It's for a portable bluetooth boombox. I found a beefy rechargeable battery for it that will output either 12 or 24v. The amp wants 24v, but 12v would be adequate at moderate volumes and would last a lot longer at the beach running on battery than if I tried to drive it at the full 24v. Since the battery can do both, why not just add a switch that allows me to switch in between the two?
 
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Old 04-09-18, 03:52 PM
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There is logic involved here.

A device running on 24v uses have the current then if it was on 12v.
I'd need detailed info (make/model) of the pack to comment further.
 
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Old 04-10-18, 05:38 AM
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Old 04-10-18, 10:50 AM
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I would recommend running the unit in the 24v mode.
That will give you the most operating life.
 
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Old 04-10-18, 03:56 PM
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Thanks, that's what I'll do.
 
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