could someone have a look at this an tell me if it should wo

chisa · Post by **chisa** » Mon Mar 01, 2010 12:10 am

work =

built it, seems to have some ground problem.

sorry for shitty diagram

chisa · Post by **chisa** » Mon Mar 01, 2010 12:11 am

without the battery it works fine, but using the leds causes some kind of short.

chisa · Post by **chisa** » Mon Mar 01, 2010 12:21 am

i think i may need a 4pdt switch

sp3k · Post by **sp3k** » Mon Mar 01, 2010 3:00 am

http://www.beavisaudio.com/techpages/Pe ... itcher.htm

you have one there, with a 4pdt switch.

Also i saw something like that on the forum before, mike did it if i'm not mistaken, and i remember it needed a 4pdt switch to have leds.

sp3k · Post by **sp3k** » Mon Mar 01, 2010 3:06 am

found it!

http://shortscale.org/forum/viewtopic.p ... nd+++begin

hotrodperlmutter · Post by **hotrodperlmutter** » Mon Mar 01, 2010 6:51 am

how is it you have it all powered by a paper bag filled with fruit?

chisa · Post by **chisa** » Mon Mar 01, 2010 9:56 am

hotrodperlmutter wrote:how is it you have it all powered by a paper bag filled with fruit?

MAGIC BAG

chisa · Post by **chisa** » Mon Mar 01, 2010 10:02 am

yeah it is the 4pdt switch i need

they cost a fortune and i can only find banzai who have them. still, it works without the leds so that'll do for the time being.

Haze · Post by **Haze** » Mon Mar 01, 2010 11:13 am

Plus it'll save you on batteries/destroying the earth slowly D:

NickS · Post by **NickS** » Mon Mar 01, 2010 11:27 am

If you just removed the red and green wires, it would work. The only thing it doesn't do then is mute the input to the unused loop, but do you really need to do that?

chisa · Post by **chisa** » Mon Mar 01, 2010 11:44 am

NickS wrote:If you just removed the red and green wires, it would work. The only thing it doesn't do then is mute the input to the unused loop, but do you really need to do that?

well i want to be able to switch between 2 different sets of effects with the push of one button and only have 1 of the sets audible at any one time

chisa · Post by **chisa** » Mon Mar 01, 2010 11:52 am

actually your are dead right nick, cheers, i give that a shot. can you explain the 3pdt switch to me (in regard to that diagram i had up) as i really don't understand it, at the moment i am just following diagrams without a proper understanding of what they do.

NickS · Post by **NickS** » Mon Mar 01, 2010 12:13 pm

I'm assuming you've made sure that the three "common" poles are the ones horizontally across the centre* in your diagram. So:
- Centre left is switched between top left and bottom left, switching IN between loop A send and loop B send.
- At the same time, centre middle is switched between top middle and bottom middle, switching the OUT between loop A return and loop B return.
- At the same time, right middle is switched between top right and bottom right, switching between grounding one LED or the other.

*spelling may vary in countries outside the UK.

chisa · Post by **chisa** » Mon Mar 01, 2010 12:40 pm

so it is like 3 switches in one?

what was happening with the diagonal wires i took out?

NickS · Post by **NickS** » Mon Mar 01, 2010 12:58 pm

chisa wrote:so it is like 3 switches in one?

Yep.

what was happening with the diagonal wires i took out?

Assume Loop A is selected. One diagonal wire would connect the Loop B send to ground at the same time as loop A's LED is grounded. However, the other diagonal wire connects Loop A send and the IN to the Loop B's LED, ungrounded. This isn't a particularly good idea, though the voltage on IN/Loop A send would be limited to around 1V-2V (depending on LED type) by the fact that Loop B and Loop A LEDs share the same resistor. Also, it might introduce some distortion/tone suck if you get a signal out of it, since the input to the effect loop is now in parallel with a diode.

James · Post by **James** » Mon Mar 01, 2010 3:22 pm

I skimmed over the thread, but I made a circuit for and built a pedal which does what it looks like you want to do.

You want to have two selectable signals like in this diagram?

On mine I have it so the left 3PDT selects between which signal is active, and the right one goes between active signal/bypass so you can run straight to the amp. If you wanted one on all the time you could just use one 3PDT and get the same result. I'll find the diagram to wire it if I still have it.

James · Post by **James** » Mon Mar 01, 2010 3:29 pm

► Show Spoiler

That's the diagram I used though you could make it without the bypass switch. You could also use a single bi-colour LED if you wanted.

chisa · Post by **chisa** » Mon Mar 01, 2010 4:33 pm

James wrote:
► Show Spoiler
That's the diagram I used though you could make it without the bypass switch. You could also use a single bi-colour LED if you wanted.

cheers, mine is the same as that but with the leds on to other side

Bill Oakley · Post by **Bill Oakley** » Mon Mar 01, 2010 6:05 pm

Try it this way:

NickS · Post by **NickS** » Tue Mar 02, 2010 5:59 pm

Yes, you might want different value resistors to balance the brightness of different colour/efficiency LEDs rather than using a common one.

[edit: coomon?? tchah!]