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 Forum index » DIY Hardware and Software
PIC based CV Quantizer (now with variable modes)
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Clack



Joined: Aug 08, 2005
Posts: 437
Location: Walthamstow - london
Audio files: 5
G2 patch files: 1

PostPosted: Thu Sep 29, 2011 1:18 am    Post subject: Reply with quote  Mark this post and the followings unread

LektroiD wrote:
Could someone explain the whole AGND / GND thing to me? I'm not getting the explanation in the documentation at all... I assume it is like this...

with 15V source, use (+15V & AGND)
with 5V source, use (+5V & GND)

is that right?

I'm now wondering which GND/AGND I use to ground the sockets, or is this intended for banana jacks?

If someone could make a simple wiring diagram that would be great, as I'm not translating this from text at all.

Thanks in advance Smile


A normal reason for GND and AGND (analogue ground) is because you want to separate the ground planes for analogue sections and digital sections. This is theoretically to reduce interference - they do directly connect - usually with a link near the power source. This is because digital circuits swing quite hard (weeeee!) between the rails and it intermittently feeds current into GND - along thin PCB traces (with slight resistance) this can create noise each time a digital circuit moves (i think) which is normally at audible speeds! it sounds like clicking - computers suffer with this loads - I get clicking through my speakers when I move my mouse.

In this circuit all the digital stuff is on 5v so you are right. Use AGND for the jacks.

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