Ad Widget

Collapse

Announcement

Collapse
No announcement yet.

Boss pedals momentary switch DPST?

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Boss pedals momentary switch DPST?

    This is kind of a follow up to my Boss DD7 thread. By trying to find any analog switching happening to trigger some true bypass circuit, for the moment it seems - there isn't any. At least in my specimen.
    This leads me to another question:
    is there a DPST (or even DPDT) version of the standard Boss pedals momentary switch?
    Or maybe something compatible? I want to avoid having to physically modify the pedal housing, in order to have something to trigger a true bypass circuit...

  • #2
    Just exactly how are you going to implement a true bypass with a momentary switch ? I think you have to modify the circuit so it's on all the time, then you can use a DPDT to make the true bypass.
    WARNING! Musical Instrument amplifiers contain lethal voltages and can retain them even when unplugged. Refer service to qualified personnel.
    REMEMBER: Everybody knows that smokin' ain't allowed in school !

    Comment


    • #3
      True bypass is overrated.

      I bet that Boss pedal has a buffered input (so it does not load pickup own) and switches after buffer so there is nothing to be gained using mechanically complicated and expensive TBP.

      TBP was a thing in the very early days when Wahs, MXR Dist+, Fuzz, boosters, etc. heavily loaded pickups, but not today.
      Juan Manuel Fahey

      Comment


      • #4
        If the DD7 uses the same Boss switch as most of their other pedals I think you may be out of luck finding anything else as those switches appear to be their own design. There are other manufacturers, though - Alpha makes a DPDT momentary switch that I often use. It does however have a click action rather than a soft switch. It's also a regular stompbox-type switch so may not suit your needs.

        There are other ways to work around this but the space inside the ebclosure could be limiting. I've previously used a miniature relay off an existing momentary switch to give two switched sections.

        Comment


        • #5
          Originally posted by loudthud View Post
          Just exactly how are you going to implement a true bypass with a momentary switch ? I think you have to modify the circuit so it's on all the time, then you can use a DPDT to make the true bypass.
          I'd either implement a classic Boss/Ibanez style flip flop circuit and trigger a relay, or use one of the readily available relay bypass PCBs (that most often need a momentary switch to actuate).

          Comment


          • #6
            Originally posted by J M Fahey View Post
            True bypass is overrated.

            I bet that Boss pedal has a buffered input (so it does not load pickup own) and switches after buffer so there is nothing to be gained using mechanically complicated and expensive TBP.

            TBP was a thing in the very early days when Wahs, MXR Dist+, Fuzz, boosters, etc. heavily loaded pickups, but not today.
            I'd say it depends, if TBP is overrated or not In a signal chain of many buffered pedals in front of a higain amp, the noise of the buffers adds up. So I'd only want to have one good, as-noiseless-as-it-can-get buffer at the beginning of the signal chain. This would be the case with a simple JFET buffer, or I have made very good experiences with the Pete Cornish buffer.

            Most or many analog Boss pedals (not sure about drives, dist or boosts) do have a high impedance buffer using a JFET or sometimes a non-inverting opamp. For their bypass switching using JFETs, You (and so do Boss...) have to decouple these by putting an opamp stage at least after the switching FET , often also before the FET. So you have up to three active stages in the signal path of a typical Boss pedal (Phaser, Chorus, ...).

            Comment


            • #7
              Originally posted by Mick Bailey View Post
              If the DD7 uses the same Boss switch as most of their other pedals I think you may be out of luck finding anything else as those switches appear to be their own design. There are other manufacturers, though - Alpha makes a DPDT momentary switch that I often use. It does however have a click action rather than a soft switch. It's also a regular stompbox-type switch so may not suit your needs.

              There are other ways to work around this but the space inside the ebclosure could be limiting. I've previously used a miniature relay off an existing momentary switch to give two switched sections.
              Unfortunately this pedal does not use the typical Boss/Ibanez style discrete flip flop switching circuit. In many if not all modern digital Boss pedals switching is done by a processor, meaning the lo/hi signals for the switching FETs are created as software and put out by the processor.
              Problem in this pedal is, there are some switching FETs, but these are put in an always-on state by the processor, and muting of the effected signal is done in digital domain. At least that's what I found with my DD7. As far as noise is concerned, this makes things even worse since all the noise that is introduced during AD/DA conversion and decoupling, ant-aliasing and whatnot, finds its way to the output signal even when bypassed. The DD7 really sounds great, I like it a lot, but putting it in front of a higain amp with not fx loop introduces an unacceptable amount of hiss.
              So in the case of the DD7 I haven't found any hi/lo switching from which I could drive a switching transistor, which then would switch a TBP relay.

              Sure I could use any DPST/DPDT momentary switch, but I was hoping for something for which I wouldn't have to mechanically alter the housing.

              Comment


              • #8
                See my comments in your two or three other threads on the same topic. To the best of my knowledge no, there are not DP variants of the Boss momentary switches. Instead, intercept the one switch in there, and have the interceptor circuit -both- work the relay and send a momentary pulse to the DD7's switch input.
                Amazing!! Who would ever have guessed that someone who villified the evil rich people would begin happily accepting their millions in speaking fees!

                Oh, wait! That sounds familiar, somehow.

                Comment


                • #9
                  I was thinking the same - intercept the exiting momentary switch. I did this with a tiny DPDT relay (I used 5v and a limiting resistor), connect the switch to the relay coil via the supply and then you have two momentary switched contacts. The one I used was around 15x7.5x10mm but maybe nowadays they can be had in a smaller size.

                  Comment

                  Working...
                  X