3 way loop selector using logic switching

[disto]

hey this is a pedal ive been working on, its  a three effects loop selector. as soon as its finished ill load the circuit up. hes a video demo.

http://www.youtube.com/watch?v=ZXDQ8g2Dzok

one of the problems i have (sort of explained in the video) is all the set/reset flip flops all start up with Q (output) being high is there a way i could prevent this?

[Seljer]

google pretty quickly brought me to this
http://www.cpemma.co.uk/flipflop.html
scroll down and theres a section on "Setting the starting state"

[disto]

ah great, thanks alot ill try that out tomorrow

[disto]

heres the schematic for the loop selector at the moment, now starts muted however i havent solved the poping.



if anyone could suggest how i can solve the poping that would be great. i have tried adding about 2M resisors accross the tip and ground of the in and out sockets, would i need to place them on all sockets?

[CGDARK]

if anyone could suggest how i can solve the poping that would be great. i have tried adding about 2M resisors accross the tip and ground of the in and out sockets, would i need to place them on all sockets?

R.G. can explain this better than me (I only use relays on my products), but until that happen, you can check the R.G. article 6/14/00 - Electronic Switching with the CD4053 at: http://www.geofex.com/

In this article he explain some tips for the CD4053, but it may be equally useful with the CD4066 in your design.

Happy reading,

CG

[oskar]

For the popping you can try and add a small rc filter (10k/47p) on the S input of the flip-flop. This way you will ensure that the signal is off before you turn it on.
Break before make...

[slacker]

Like CGDARK says if you do what R.G suggests here that should fix your problem.
I've just finished something using 4066s to switch audio and I decoupled them like in that article and I get no popping.

[disto]

thanks CG looks like that could be exactly what i need, ill have to have another play about with that. theres soooo much stuff on geofex i spent a good half an hour trying to find and article i knew had been written on there somewhere the other day.

thanks slacker thats very reassuring, glad to hear that i dont need the 4053s saves me going out and buying more chips i dont need.