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If you're changing from a BC549, learn from my mistake: the pinout is different for the MPSA13. It's rotated 180 degrees.

I recently changed my Q10 for an MPSA13 and am sorry to relate it made very little discernible difference to my ears. I recorded a few phrases on a looper for the Before reference and it sounded pretty much the same after the Darlington switch. Try it though, as always YMMV.

I'm trying to translate this stripboard layout diagram to a 3PDT wiring board and my head hurts. Can anybody tell me where on the stripboard to connect the switch board's in and out (BI and BO)?

Aha, basically creating your own diffused LED? I've gone up to 36k and it's an improvement but still surprisingly bright.

And I probably shouldn't have taken it as a challenge slash personal affront when the Vibe documentation warned that this was not a project for beginners. That being said, I now have the speed pots wired correctly and the bicolour LED changing colour with a click of the speed 4pdt. Both the...

No problem. I appreciate your help.

So I have the bicolour LED working now but my speed pots are both working in reverse: fastest at fully counterclockwise, slowest at fully clockwise. Am I reading your diagram incorrectly? I assumed you were showing the speed pots from the underside (ie not the shaft side) with the dark purple...

Hi. I'm actually just now getting back to this project. Is the common cathode of the bicolor LED wired to the middle lug of that fourth pole on the switch?

Below is the documentation's advice for incorporating a speed indicator LED (though again I can't read schematics), for whatever it's worth. But I've built this Uni-vibe in a JJ enclosure so I doubt if it'll be possible to squeeze another mini-board in there.

Thank you both. This is very helpful.

Thanks for the responses. I was flattering myself when I said my electrical knowledge was limited. In reality, when I build a pedal I am painting by numbers. I have no idea how to go about this. If it helps, I've wired up the pedal like this With serial switching between the 2 x two-gang...

How do I figure out if I need common anode or common cathode? It appears I have used a common cathode LED, so presumably I need a common anode one? But also, what do I have to do to get it to flash with the LFO speed?

Hello. First time posting here. I can't find info on this that I can understand. So I have built a Forum Vibe with two speed pots and a 3PDT switch to switch between the two pots. I want to add a bicolor LED that will indicate both LFO speed and change colour depending on which speed pot is...