Electronic bypass: Boss or DOD ?

Started by Morocotopo, March 17, 2006, 08:52:06 PM

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Morocotopo

Hi, I´m trying to get my Ross comp build finished,  made the PCB, got it to work OK, nice sounds, then I started to think how to bypass, and the troubles started >:(
First: DPDT w/ millenium: pop, pop, pop... (millenium works OK though)
Then, Tone god switch: pop, pop, pop...
Then: hours of reading posts (many!)
So: GRRRR, forget true bypass, forget 4066, 4053, pulldowns, caps, praying, cursing, biasing, hammering, I want to get the Goddamed thing assembled and working!!!  :icon_mad:
From what I´ve read they all have some sort of trouble with pop, if Boss and DOD made it work, fine, I´ll follow them!!!
The question is: Have you tried them? Wich one is best? I have the schems from RX5 (Boss) and David DiFrancesco article (DOD). Anybody tried the DOD PCB from difedetry? Anybody made a PCB for the Boss? If the Boss is not PCB´ed yet, i would happily make one, IF IT WORKS OK, and share it (never designed one, but would give it a try)

Thanks
Morocotopo

jrc4558

Check the input and output capacitors first. Also, check that your LED indicator and your board power lines be decoupled. insert a 47 ohm resistor in series with your PCB's 9V+ pad and a 47µF cap from it to ground.

Peter Snowberg

Grab a meter and check for any DC voltage on your input and output. You shouldn't get any popping with CMOS switching unless you have DC leaking in there some place.

Welcome to the forum.  :icon_biggrin:
Eschew paradigm obfuscation

Morocotopo

Thanks Peter and Constantin, I´ve checked the in /out caps, just to be sure, I have to put the red probe to the caps "outsides" and the black one to ground, right? What should be the maximum allowable voltage? Errr.... I should measure DC mVolts right? Or there should be none at all?

Peter, when you say I shouldn´t get any popping w/ CMOS switches you mean ALL of the designs available (4066/tone god, 4053/Keen, Roma I haven´t tried)?

Constantin,  the Resistor/Cap mod is for the decoupling you mention?

Thanks so much guys, i´ll try your suggestions, I want it to work! Now!  ;D
Morocotopo

Peter Snowberg

Your placement of the probes sounds correct (ground and the cap lead that connects to the jack). With the meter on mVDC you should see nothing or amazingly close to nothing.

Can you post a schematic of exactly what you're wiring up?

Eschew paradigm obfuscation

Processaurus

I just had a popping problem with my first CMOS switching project (4053 from Geofex), the problem wasn't the design, but varying DC levels between the switch throws like Peter was saying.  Fixed the leaking DC and it was good to go. 

Danelectro uses CMOS switches in their commercial pedals, and they don't pop.

Peter, to test for a DIFFERENCE in DC values, maybe its better to put your two probes on the individual open switches in and out (in the case of the 4066) or between the two throws of the switch (in the case of the 4053), to see if there is a difference in DC level when the switch is open?  I say this because in the case of the Geo design it has a 1/2V+ bias on all the ins and outs.

Morocotopo, is it possible something is leaking DC onto your inputs or outputs from an external source (previous effects/amp)?

What kind of mechanical switch are you using? momentary or latching? 

Is your switch debounced?



Morocotopo

Thanks for the answers, sorry for the delay to respond, work...
I tried your suggestions, but no results, nothing else in the signal chain, maybe operator error, but i followed your instructions as best I could. I´m not so newbie, after all , I built the goddamed Ross comp, PCB and all... ;D
So, anybody has the Danelectro bypass circuit?
The reason why I asked for the boss or DOD bypass circuits is that I believe they switch gradually, so the pops are eliminated, right? I´m not a "true bypass or death" kind of guy, I just want the !"·$%&/() pedal thing to work, and with no switch noise, AND with the footswitches I can buy here!! now i´m angry!  :icon_twisted: I WILL get it to work!  :icon_evil: It will not beat me!!  :icon_evil: Or i will crush it to pieces!!  :icon_mrgreen:
I think it´s curious that there are no posts from people who built the Boss or DOD bypass succesfully... or is everyone here a true bypass believer? or they don´t work?  or... ???


Morocotopo

Morocotopo

Oh, by the way, thanks for the welcome Peter  ;D
Morocotopo

anti-idiot

post some schematics of the danelectro and explain abotu the 4053, cos i want some electronic swithing too (but w/2 Indicator LEDs.
Moroco, myabe u can use the Ibanez type
If I was God you'd sell your soul to...

Morocotopo

 anti-idiot, do you have a schematic and/or PCB ( ;)) of the Ibanez electronic switch? Or anybody? I´m currently making the PCB for the DOD switch that Difedetry showed in some post, even though he didn´t post the PCB, I made it from his layout image (hope it works!!!!)if it does work, and Difedetry doesn´t mind, I´ll post the pcb, and my experiences with it. As i said, i have a Boss schem, but not a PCB, I´ve never designed one, but, if all else fails, I´ll try... :icon_exclaim:
Morocotopo

anti-idiot

sorry, no PCB's, and 'bout the schem., only the ones in the gallery and  this one.
if u have some pcb, please send 'em to me, and if you (or anybody) know how to put a second LED in that circuit, help me!!
i want that elec. bypass to work w 2 LED's (blue for on, red for off)
If I was God you'd sell your soul to...