[sdiy] Signals leaking into the PSU?

[Mike Bryant]

From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Mattias Rickardsson <mr at analogue.org>
> The constant-current designs for LED-bar level meters found in mixing console schematics are nice, perhaps the simpler circuits above are hiding there as well?

Generally on analogue mixers all the random leds other than fixed on/off ones are driven in the same manner using a constant current tree, even if unrelated to each other.  On digital ones, they are quite often bidirectional leds so all you do is flip around the led supply to get a different colour (good/not good) so the heat doesn't build up inside the unit quite so much.


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