Boss GT-1000 (and possibly other things Boss...)

[ian_dissonance]

I tend to save stuff after I change it with the stompboxes, I didn’t even know you didn’t need to do that.

 

[Sascha Franck]

I tend to save stuff after I change it with the stompboxes, I didn’t even know you didn’t need to do that.

Well, as said, I always knew you wouldn't have to save anything as long as you didn't switch the thing off - and hence expected it to be the same when rebooting as well, especially as that'd be truly "accurate" to whatever real stompbox behaviour.
Will likely have to develop some new patch setup idea for the small board.
In an ideal world there'd either be a "save all stompboxes" function or a preference for "autosave all stompboxes permanently".

 

[nikitasius]

Testing a filter for chinese PD trigger (plugged into my Anker powerbank):

Yellow - pd trigger on 9V, no load
Pink - another 1$ pd trigger but with filter, 9v and no load



Here pink got boss plugged into


Actual noise is around 1.36mV (x30..x50 less than original PSU).
Now need to eliminate/reduce this one and i will get clean and cheap power

 

[ian_dissonance]

Testing a filter for chinese PD trigger (plugged into my Anker powerbank):

Yellow - pd trigger on 9V, no load
Pink - another 1$ pd trigger but with filter, 9v and no load
View attachment 55975


Here pink got boss plugged into
View attachment 55976

Actual noise is around 1.36mV (x30..x50 less than original PSU).
Now need to eliminate/reduce this one and i will get clean and cheap power
View attachment 55977

So you’re building a PD adapter for super low noise?

 

[nikitasius]

So you’re building a PD adapter for super low noise?

Short : yes.
In fact it’s an old idea. I have linear adapter over 2kg
too heavy. I also made some tests and seen that pd trigger (one i bought on aliexpress for 0.90€ per piece) can handle 9v and upto 3-4A of current. The issue was the noise (from powerbank) and from the boss itself. So i abandoned this idea. But now i have tc electronic sentry which ate all my 9v batteries. I digged a bit into filtering back and made simple filter with caps. It seems to give decent result. I don’t have lot of c0g, most are x5r cheap caps, but I think correct LF filter will make it better. Also the place where i test have lot of radio noise (my iphone near, android, anker itself, few led lamps…).


Results are better than before.

Small and cheap for testing:


Guess once i have prototype with LF filter (not the way i did), i can print pcb and solder few for test drive.