Beiträge von studiotal

I just assembled an A/B/Y switch kit. The switching works. But there is something wrong with the LEDs. And I just can't figure out where I made the mistake.

This is how the A/B/Y switch works:
Switch 1 (A/B) switches between the two channels. The LEDs for A and B show which channel is on.
Switch 2 (Y) combines A and B. When switch 2 is engaged, the LED for Y is on. The LEDs for A and B show which channel you will return to when you disengage switch 2.
https://www.musikding.de/docs/musikding/aby/abywire.pdf

This is my problem (see below):
switch 1: LED A (red) OR LED B (yellow)
switch 2: Out A LED A (red) -> LED C (green) doesn't work
switch 2: Out B LED B (yellow) -> LED C (green) works

The weird thing (to me) is that on the Y switch the lug that powers LED C has voltage, both when LED A (1.6V) or LED B (1.8V) are on.

Any suggestions? Thanks!

[Blockierte Grafik: https://live.staticflickr.com/65535/50255455886_a16e00b374_b.jpg]

Just realised I did not report back after this. I made a rookie mistake: I only looked at the schematics and not at the actual pcb. Right next to resistor R4 there is a trimpot on the pcb (mini trimmer 25k - R5), and that does exactly what I was looking for.

Again, thank you Uwe!

I will need to order some parts and get to work.

Thanks Uwe!

Any suggestions to what value?

Hello all,

I have assembled Das Musikding's The Bluelay, which is a Deep Blue Delay clone. It works, and I like it.

There is one small issue: when I activate the pedal, the dry signal has a small but noticable volume drop. The delay signal stays at the correct volume.

What could be causing the volume drop? And to fix it?

Here is the link to the schematics: https://www.musikding.de/docs/musikding…elayV2schem.pdf

Thanks!