Re: Line powered audio switch, is this feasible ?
- From: Luhan Monat <x@xxx>
- Date: Tue, 19 Apr 2005 13:16:15 -0700
OBones wrote:
Hi
I've got a mechanical audio switch that does this:
o- Spk L Out L -o--__ o- TV L
o- Spk R Out R -o--__ o- TV R
It's really a simple thing, and for my own knowledge, I was wondering if it would be possible to replace this with an electronic switch. I can always use analog switches (FSA4157A, ADG884 for instance) but these require an external power source.
So I was just wondering if one could draw enough current from the line to actually power the switches. If this is not feasible, that's no big deal, I'd just like to hear about possibilities in this area.
Cheers Olivier
Line powered? I doubt it. If someone can, I'll ad it to my 'bag-o-tricks'.
Minimully, you need external power to run a PIC12F675. Analog inputs monitor all four source channels, determine which is currently active and engage a DPDT relay to route the sound (assuming you are swithcing speaker level).
Otherwise, CD4052 4:2 Analog Mux instead of a relay to switch line level signals.
-- Luhan Monat (luhanis 'at' yahoo 'dot' com) "The future is not what it used to be..." http://members.cox.net/berniekm .
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