SD-1 turns 'on' when guitar cord is plugged in. Help Please

[12StringStratMaker]

I don't really see the problem.  You plug your cord in, the effect is on, you stomp the switch, it goes off.  It works, sounds good,so don't worry about it.  Just play and enjoy. 

Scott

I understand what you mean but personally I'd like it for two reasons:
1) When playing live, if there's ever a quick power flash (and it's happened before), whether it be a bad AC adapter or bad power socket, or whatever, during a song, then 5 or 6 effects will jump in, rather than going back to a clean sound where I'd probably have to hit an overdrive or something.
2) I play a lot in short amounts in my apartment, which means I turn on my pedal board quite a few times a day, having to turn off all my effects before I can begin.  It's a convenience thing.

I know I can live with how it is now, but why not strive for perfection? I'd rather put in some time up front to get it the way I like it than to have a little irritation each time I plug in.

[Transmogrifox]

I don't really see the problem.  You plug your cord in, the effect is on, you stomp the switch, it goes off.  It works, sounds good,so don't worry about it.  Just play and enjoy. 

Scott

I understand what you mean but personally I'd like it for two reasons:
1) When playing live, if there's ever a quick power flash (and it's happened before), whether it be a bad AC adapter or bad power socket, or whatever, during a song, then 5 or 6 effects will jump in, rather than going back to a clean sound where I'd probably have to hit an overdrive or something.
2) I play a lot in short amounts in my apartment, which means I turn on my pedal board quite a few times a day, having to turn off all my effects before I can begin.  It's a convenience thing.

I know I can live with how it is now, but why not strive for perfection? I'd rather put in some time up front to get it the way I like it than to have a little irritation each time I plug in.

I agree.  It is a minor irritation to flip on the power and have to stomp 4 or 5 pedals before you can start playing.  Not a huge deal, but it's certainly worth putting a little effort into modding a pedal to power up in its bypass state.  I have programmed a microcontroller to do switching from a momentary.  It always powers up in the bypassed state, because I have programmed it to do that.  I have been pondering the thought of storing its state in EEPROM so that it always powers up in the last state it was in when powered down.  In most cases, I like my pedals to power up in bypass mode--it's just that the memory thing would be really nice in case of a "blip-out" where the power flickers briefly during a gig.  Maybe we should just put UPS's on our pedalboards.

[12StringStratMaker]

Maybe we should just put UPS's on our pedalboards.

Ha ha, is that what we've come to? 
I think I'll just click my pedals off.  Still too bad about the transistor switch, it would have been nice if that was the simple solution.

[mimmotronics]

(Not) to ressurrect an old post butttttt I got bored and tried this on my SD-1.

First I tried Mark's suggestion on rerouting the diodes for the JFET switching. That didn't work unfortunately :/

The second idea was to simply swap one side of the flip flop circuit with the other. I swapped the transistors Q3 and Q4, also swapped the caps C15 and C16, again with C13 and C14. Those did not work. I then swapped the resistor R26 with R27, and then R22 with R23. After those, the mod worked and the pedal now turns on with the opposite state as the default (in my case, it now turns off, and was turning on).

The theory was that the tolerance values of the caps and resistors make it so the circuit isn't perfectly symmetrical. Therefore, if we just swap one side of the circuit with the other side, then that should result in what OP is after.