Delay with millenium 2+...

[Hanglow]

I just did a couple of pedals with the modified millenium 2 plus bypass, the one that you can ground the input of the effect as I has some problems with oscillations when the effect was bypassed. But now I'm getting a small delay when switching the effect on, is this normal or is there anything I can do to address this?

I used the first schematic on this page

http://www.geofex.com/Article_Folders/Mill2extn/mil2plus.htm

Thanks for any help 

[R.G.]

It depends on exactly where in your circuit you grounded it, and possibly how the switch operates. I'd have to see the schemo of what you did to say more. Any time you us a cap, there is a possibility of delay while it charges, but this should not be too noticeable here.

[Hanglow]

Thanks for the reply RG


Here's what parts I used, I didn't have exact parts in your original so I subbed some closest values



The "signal shunt line" is attached to the board input lug at the dpdt footswitch


The effect itself is a bufferless tubescreamer

[R.G.]

The "signal shunt line" is attached to the board input lug at the dpdt footswitch
The effect itself is a bufferless tubescreamer

Try these and see if they make a difference
- add a 1M in parallel with the NPN transistor on the bottom of the 100uF cap, collector to emitter
or
- change the 100uF to a 10uF and see if the delay is less.

[Hanglow]

thanks for the suggestions RG but there is still a small delay 

[R.G.]

thanks for the suggestions RG but there is still a small delay 

Hmmm.

Try adding another 1N914 in parallel with the first one. The action of this circuit is fairly delicate, sensing as it does the few nanoamperes of leakage of the 1N914. It is possible that the delay you're seeing is simply the time it takes to charge up the gate capacitance of the 2N7000. Doubling the 1N914 should cut the time a bit, at least enough for use to tell what to do next.

[Hanglow]

I'll try that this weekend 

[Hanglow]

Ok, managed to try it just there. It definitely cuts the delay, but it is still there a bit.

I tried adding another diode on top of the one you suggested as a wild stab in the dark and the bypass and LED flutters in and out intermittently

[R.G.]

It may be that the time constant of the leakage current and the high gate capacitance of the MOSFET are going to make the delay irritating. If another diode doesn't help, yell and we'll figure out something else. Maybe the Millenium C would work better. The input capacitance is much smaller.

[Hanglow]

I misread your previous post and put an extra diode on the wrong diode 


Now it's working great! You are a gentleman and a scholar   


cheers

[R.G.]

Hey, great! That was a new one on me. Glad it worked.