Multiple inputs o.k. on PCB?

Started by Evad Nomenclature, March 04, 2009, 12:30:41 PM

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Evad Nomenclature

So I've been working on building/etching my own PCB's.
Basically taking existing circuits that I want to build and either creating my own layout, or tweaking existing layouts with mods that i want to add to the pedal and then etching the new versions.

(I wish I could draw this atm, but I'll try to word in out)

On a boost pedal for instance:
Is it ok to have 2 input tracks built on the board, both tracks are layed out with an input cap and resistor to ground.  The tracks converge at the point right before they would catch the resistor back from the collector side of the transistor.  Like so...


Input 1 --Res. to ground-->--Input Cap 1--------------|
                                                                            |---->--->> rest of circuit.
                                                                            |
Input 2---Res. to ground-->--Input Cap 2--------------|

There would be a switch obviously, pre input of the PCB to select which track the signal would run through. 
I'm like 99% sure it should work, I just didn't know if there needed to be some sort of block, so current couldn't flow into the other input or something.
(uhhh diode or something?)

Just wanted to check before I went and printed a transfer of what i did.
:icon_mrgreen:

thanks for answering the newb questions as always.

Dave
Evad Nomenclature III
Master of Dolphin Technologies

R.G.

R.G.

In response to the questions in the forum - PCB Layout for Musical Effects is available from The Book Patch. Search "PCB Layout" and it ought to appear.

alanlan

I'm not sure I follow: if you are using a switch prior to the PCB to switch input jacks to the circuit then why do you need 2 inputs on the PCB?

If you do this, be sure not to wire your inputs with a ground mute i.e. where the input is grounded automatically when you pull out the jack.  If you don't happen to use a switch then grounding one input would ground both.  Seems a bit redundant.

Why not consider having 2 input circuits to isolate the instrument inputs from one another and then join/mix them after this point.  That way, you can use either or both inputs and have each input grounded if not used to minimise noise- all without a switch.

Evad Nomenclature

It was basically to have different input caps for different frequency responses at the beginning of the pedal, not to have multiple inputs.

My reasoning is that I'd rather have as many components *onboard* the pcb as opposed to caps on switches and stuff like that.
I also started making a slot on the pcb for the led on the power supply line to make it so i dont have to have a secondary mini board on the side, or the arbitrary led wires over the center of the pedal.

So, erm, not multiple inputs, just multiple input paths for 1 instrument.
dave
Evad Nomenclature III
Master of Dolphin Technologies

Evad Nomenclature

Where are my manners! 

P.S. Thanks RG =D
Evad Nomenclature III
Master of Dolphin Technologies