dumb bypass question

[Narcosynthesis]

here there are three ways of bypassing an effect with a dpdt (i borrowed the picture from geofex if anyone finds it familiar, they have a good article on bypass, but dont really say if any of these are much better, apart from mentioning one grounding the input)



does it make a difference which i use? the bottom picture looks simplest and least likely to get muddled up, so are there any advantages in using the others?

the effect will be wired with an led, i have the 3pdt i need to get the extra 'switch' for that

David

[The Tone God]

The bottom one is the easist but the top one with the slight modification of grounding the input when bypassed is IMHO the best. It depends on your circuit but I like to ground my inputs to make sure nothing funny is going on when the circuit is bypaseds that could leak into the signal.

Andrew

[Narcosynthesis]

it will be for a lbp2 and rangemaster, so basically the top one is best, with the spare input (where the input will be connected when its bypassed) connected to ground

David

[R.G.]

so basically the top one is best, with the spare input (where the input will be connected when its bypassed) connected to ground

No. That does not follow.

Grounding an input - or any other point in your circuit - is OK, but is generally only necessary if you have a high gain circuit with a high input impedance. It won't hurt on other things, and you may feel better because you know the input is grounded, but it isn't necessary.

Especially on an LPB2 or a Rangemaster, the gains are not high enough and the input impedance is not high enough to make grounding mandatory. You can do it, but it won't help or hurt.

I'm pretty free with opinions, and if I thought one of those was "best" I'd have said so. They are three different ways of doing the same thing, and other chanracteristics will determine which one to choose.

Beginners will like the bottom one, because it's simple.
The first one lets you ground an input.
The second one enables the Millenium Bypass to work; the Millenium extensions, by the way, offer a grounding capability as well.

[space_ryerson]

Am I crazy, or does the second one in the diagram have an error in the switching? (IE; when switched on, it wouldn't pass signal.) Maybe I'm just missing something obvious.

[Processaurus]

yeah, in the second example, one pole is shown in the bypass position and the other pole is shown in the effect position.

I've been wondering since learning different TB schemes if the bottom example is more likely to click when being switched, because the signal has to go through 2 sets of moving contacts rather than one?

[Narcosynthesis]

if grounding the input would give no benefit, then i guess the bottom one would be simplest to wire up correctly

David