bleeding when creating multi-effects units

[bdevlin]

I saw in an earlier post that this was a concern.  In what form does this issue surface?

I built four pedals and put them into an enclosure and didn't notice anything odd.  Now I am building a few circuits using one big piece of perfboard.  The initial plan was to cut up the perfboard when the individual circuits were completed and tested.  Now I am considering just leaving them on the big perfboard and making another multi-box.

[Peter Snowberg]

It all comes down to layout. If you're lucky, you'll have clean signals. If you plan it that way, you can also have clean signals.

Problems tend to come from high impedance inputs and situations where input and output wires run any distance in parallel. If parallel routing is the only option, then shielded cable like RG-174 with the shield connected *at one end only* is your best defence.

You can always try things out with all the circuits together and if you don't have problems, you're done. If you do have bleed, start replacing the input wires with RG-174. If that doesn't help enough, space is the best solution.

Electromagnetic fields dissipate by the square of the distance. If you have 10mV of bleed at 1 inch, you will have 2.5mV at 2 inches and 0.625mV at three inches.

Best wishes on your build.

[RaceDriver205]

And if its really really bad, go to your supermarket, and buy a large roll of cling-film and al foil.