DL4... True Bypass, how?

[ExpAnonColin]

In my how much capacitance... thread the DL4's true but electrical bypass system came up.  Does anyone know how it works?  There are spst momentary switches and no relays, the circuit is mostly an EPROM, but it is generally accepted (by that I mean, if you were to post "is the DL4 TB" on the harmony central forums and the GG forums, the reponses would be "yes") that the box is True Bypass.  How?  It doesn't make sense that you can make an EPROM create a solid electrical conductor with nothing else in the signal path.

-Colin

[Mark Hammer]

I posted a thread several months ago asking about this, though with reference to another arrangement that wasn't quite TB.  I forget the particulars, but people were pretty adamant that you can't call something TB if it isn't straight wire.

On the other hand, the whole point of TB is that it gets past the traditional sticking point of SPDT stompswitching - namely that the effect circuit was always there sucking tone even when you were nominally in "bypass" mode.

So, if you can do something that isn't "orthodox TB" (a straight wire connection either by means of relay or mechanical switch), but you've addressed all the problems associated with what SPDT switching used to do, is that a reason to be unsatisfied?  If your answer is "No", and something like CMOS switching meets your criteria for TB-workalikes, then there is no reason why that could not be part of an LSI chip, and no reason why something like the DL4 could not be called "true bypass".

Of course, if you feel that TB is a label reserved for a very specific set of conditions (restricted to just straight wire arrangements), then obviously you are allowed to say "No", and use some other term to describe or refer to those other arrangements.  Distinguishing between classic TB and other equivalent arrangements need not be an expression of better and worse, but may be merely a convenient label to more accurately descibe circuits.

[Johan]

In my how much capacitance... thread the DL4's true but electrical bypass system came up.  Does anyone know how it works?  There are spst momentary switches and no relays, the circuit is mostly an EPROM, but it is generally accepted (by that I mean, if you were to post "is the DL4 TB" on the harmony central forums and the GG forums, the reponses would be "yes") that the box is True Bypass.  How?  It doesn't make sense that you can make an EPROM create a solid electrical conductor with nothing else in the signal path.

-Colin

DL-4 is true bypass and there are two small relays (the little white boxes near the input/output jacks. since there is four swichbuttons and it all is digital it doesnt use simple flip/flops like all the analouge pedals.
you can easily mesure it by unpluging the powersupply, connect cables to input and outputjack then mesure tip-tip and tip-sleeve...

Johan

[ExpAnonColin]

So, if you can do something that isn't "orthodox TB" (a straight wire connection either by means of relay or mechanical switch), but you've addressed all the problems associated with what SPDT switching used to do, is that a reason to be unsatisfied?  If your answer is "No", and something like CMOS switching meets your criteria for TB-workalikes, then there is no reason why that could not be part of an LSI chip, and no reason why something like the DL4 could not be called "true bypass".

That's exactly my argument in my "how much capacitance makes a circuit non-TB" thread.  We can call it "electrical true bypass".  Sorry that I didn't see the other thread, I searched for DL4 bypass and DL 4 bypass.

-Colin

[ExpAnonColin]

DL-4 is true bypass and there are two small relays (the little white boxes near the input/output jacks. since there is four swichbuttons and it all is digital it doesnt use simple flip/flops like all the analouge pedals.
you can easily mesure it by unpluging the powersupply, connect cables to input and outputjack then mesure tip-tip and tip-sleeve...

Johan

So it actually does use relays?  That's mind boggling.

-Colin