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Old 6th August 2008, 11:36 PM   #1
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Default Speaker switch

I'm just starting to design an A/B speaker switch, that will use a small 8 pin PIC (12F675) and a couple of latching relays, operated by any style of momentary push button switch. It will also provide LED indication of which speaker is selected. I will design a couple of PCBs to suit. Just testing to see if there would be any interest in this project - if so I will get a few more PCBs made at the time.
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Old 7th August 2008, 06:04 AM   #2
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Please provide some details like power handling, and how to get PIC source code etc.
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Old 7th August 2008, 06:31 AM   #3
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I'm still looking at options for the relays, but would be min 8A switching rating. Going for latching does seem to limit the options available (at least for high quality sealed), and I prefer to use latching in this operation. I was thinking about paralleling 2, but I've gone off this due to concerns if 1 relay fails and doesn't switch over. Although I guess you would notice this (both speakers playing), so maybe it isn't such a big deal and it might be better power handling/quality wise to parallel two. Your thoughts?

Happy to make the source code freely available - there's no rocket science in it - so you can change it as you see fit (eg I'm making it light up 1 or 2 LEDs depending upon which speaker is selected)
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Old 7th August 2008, 06:40 AM   #4
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Why latching relays ? You really narrow your choices....
If you want to make something easy to build, go for standard relays (consumption is only 30-40 mA at 24 Volts).
If you go for e.g. FINDER Series 4061 (16A) relays, the special Amplimo (20/100A) speaker relay fitīs in.
www.amplimo.nl
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Old 7th August 2008, 06:50 AM   #5
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I really wanted to have next to zero power consumption (as these are never turned off) and having 4 relays potentially "on" all the time would be using a constant 4W. I know, it's not much but I would prefer if it was 0.1W (PIC power draw only)
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Old 7th August 2008, 06:52 AM   #6
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Do you want two sets of speakers (two relays) connected "activated" at the same time

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Old 7th August 2008, 06:56 AM   #7
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No but I would use one relay for the +ve, one for ground for each channel - sorry I wasn't clear
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Old 7th August 2008, 06:57 AM   #8
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Why one for ground
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Old 7th August 2008, 07:29 AM   #9
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I prefer to switch all connections. Just a personal preference. Likewise with preamp input switching.
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Old 7th August 2008, 07:49 AM   #10
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That's ok
I agree regarding preamp input switching to prevent crosstalk between inputs, but for speaker outputs I don't see the point....
However good luck with the project
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