Products > Test Equipment
Power Supply: Build or Buy?
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Fungus:

--- Quote from: nctnico on May 04, 2023, 08:34:58 pm ---Be sure to get a linear power supply as your primary lab power supply. Switchers (which includes those dc-dc converter modules) output too much noise to make meaningfull measurements to a circuit.

--- End quote ---

Depends on what you're building. Digital circuits won't care.
nctnico:

--- Quote from: Fungus on May 04, 2023, 09:33:55 pm ---
--- Quote from: nctnico on May 04, 2023, 08:34:58 pm ---Be sure to get a linear power supply as your primary lab power supply. Switchers (which includes those dc-dc converter modules) output too much noise to make meaningfull measurements to a circuit.

--- End quote ---

Depends on what you're building. Digital circuits won't care.

--- End quote ---
Digital doesn't exist. As soon as you connect a scope to hunt down a problem, you can easely get a lot of noise on your display that is not coming from your circuit but from a switching PSU. So what is what?


--- Quote from: james_s on May 04, 2023, 08:59:47 pm ---Switchers can be very clean, it's all a matter of how well they are designed. Linear power supplies are easy to make quiet though.

--- End quote ---
No. I own and have owned quite a few of the high-end HP switching PSUs and none of them have a really clean output.
br4n_d0n:
Yeah, I was thinking of going for a linear one.
james_s:

--- Quote from: nctnico on May 04, 2023, 10:07:25 pm ---No. I own and have owned quite a few of the high-end HP switching PSUs and none of them have a really clean output.

--- End quote ---

That doesn't mean clean switchers don't exist, merely that the specific models that you've had are noisier. For most things it doesn't matter, for some it does. It's certainly easier to find a linear supply with a really clean output but it isn't the only option.
Fungus:

--- Quote from: nctnico on May 04, 2023, 10:07:25 pm ---No. I own and have owned quite a few of the high-end HP switching PSUs and none of them have a really clean output.

--- End quote ---

I see the noise nannies are out again.

Stated use cases are:
Powering a soldering iron
Electroplating
Making electromagnets

At what point would 50mV of noise make the sky fall?


--- Quote from: james_s on May 05, 2023, 12:08:22 am ---That doesn't mean clean switchers don't exist, merely that the specific models that you've had are noisier.

--- End quote ---

It also doesn't mean that somebody who wants to build their own from a kit can't add some filtering.
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