Re: Reduction of unwanted signals

[DriftZ]

But what if your pots are not in rows?

Ofcourse they are in rows, use you imagination ;)

the starlike thing means, if you have X number of pots, you dont connect them all to 1 ground loop.

Example 16 pots:

Wrong: GND-pot1-pot2-pot3-.....-pot16-GND

Better:

NC-pot3-pot2-pot1----GND----pot4-pot5-pot6-NC

NC-pot9-pot8-pot7----|  |--------pot10-pot11-pot12-NC

NC-pot14-pot13-------|  |--------pot15-pot16-NC

(NC means Not Connected to GND on that side)

this is a 'star' with GND in the centre

etc....

Right ? :)

[Nomical]

Anyone know something about the placement of components on a pcb?

[Duggle]

hi,

follow the general trend of the supplied pcb's of MBHP to a provide basic guidelines.

If you keep wires and tracks within the recomended lengths you should be fine.

The most important thing for these circuits is a clean powersupply. The 5V regulator on the core is definitely sufficient so long as it is driven by an adequate supply.

(9VDC under load).

One common engineering practice that Thorsten doesn't seem to follow is to connect 100nF (or thereabouts)monolithic caps across the 5V rail of (each) the logic ic's. This is more of a precausion against glitches that may come about under more or less unusual circumstances. The obvious success of MBHP says theyre not strictly necessary for correct circuit operation. I used them on my midibox out of habit (accepted design practice).

cheers

[Steven_C]

This subject has writings spread all over this forum, do asearch to find heaps of info....