How to reduce DC noise

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Can you post a schematic?

Is noise on the input to the regulator?

I am getting a 50 mV peak to peak 100 Hz noise on the output of my final voltages and because these are being used to control some very sensitive amplifiers, this is really causing me problems.

This type of post requires a schematic showing ALL of your components and as much information as you
have on the power supply and what is powering the power supply (what voltage) (ie: what country are you in ? ) and preferably a photo of the wiring. I am particularly interested in the op amp circuits (specifically part numbers, schematic etc) . Please post whatever data you have that substantiate your claims of 100 Hz noise. Scope screenshots would be great but usually we don't get those.

Hi,
Welcome to the forum.

Please read the first post in any forum entitled how to use this forum.
http://forum.arduino.cc/index.php/topic,148850.0.html .

Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?
Can you please post an image of your project so we can see your component layout.

What is the physical component layout?
Breadboard, Protoboard, Stripboard, PCB?

Thanks.. Tom.. :slight_smile:

Normally when using ADCs and DACs you would have a separate clean analog supply rail for them, to
avoid this very problem. A separate linear regulator would normally be used to derive the analog supply,
whereas digital supplies are much less sensitive to noise and switching regulators are typically used for
that side.

Some ADCs and DACs have two supply pins, one for digital, one for analog, but if there's only one as in
the MCP4728 it should be treated as the analog supply and be nice and clean.

DC/DC switching-power converters are notorious for physically disrupting an otherwise carefully designed system and circuit schematic designs. These power converters drive unwanted charge onto electrical ground, causing false digital signals, flip-flop double clocking, EMI, analog-voltage errors, and damaging high voltages. As the complexity of these designs increase and applications become more densely populated, the physical-circuit implementation plays a critical role in the electrical integrity of the system. This article illustrates two major sources of ground noise and offers suggestions on how to reduce both.