Re: Dub Siren.

Posted by Beaker on Jan 06, 2016; 5:32pm
URL: http://guitar-fx-layouts.238.s1.nabble.com/Dub-Siren-tp17189p26987.html

It sounds like my mods to version 2 (move top connection of left hand 68k up a row to transistor base, and wire between Mod switch lug 2 (centre lug) to row 2, left hand side of the board) and Da$t's description of the way his LEDs are working are not quite doing the same thing.

With my "mods", I'm getting the same as Da$t from the Mod switch, but the permanent/momentary switch works differently (and more logically). I'm getting the LED lighting up when in the "permanent" position, then going out when switched to "momentary" position. It will then light up every time I press the momentary button.

So I think the way mine works is "better"??? Seems more logical at least.

I tried wiring the 68k resistor to pin 3 on the other 555 as you suggested, and got the Mod LED pemanently on, but the perm/mom switch acting like Da$t describes. So a biy of a failure there.

I would be tempted to reinstate version 2 with my "corrections" and call it verified.

On the plus side, I've found a cool hack for this circuit. If you take a wire from the unused lug 3 of the mod switch and connect it to ground via another switch or push-button (either permanent or momentary), you can get a whole extra range of drones bleeps and whistles!