[sdiy] Power supply of a 19" rack
marzacdev at gmail.com
Wed May 15 16:18:31 CEST 2019
Thank you for your feedback.
I totally get the principal arguments for the direct mains input.
But having the supply electronics outside the rack have still
some more great advantages:
- it won't perturb the rack electronics by emitting HF
(which should not happen if the block is well designed)
- it won't generate heat inside the rack
- if it fails (and it's more likely than the rest of the electronics),
it's easier to replace / repair
- the rack can be battery powered
About filtering, I guess a filtering block is an absolute
necessity for both options (mains or wall).
Have a good day,
Le 14/05/2019 à 23:30, Justin Herrmann a écrit :
> I prefer the mains option, but only because I hate all the space a
> wall wart (AC to DC adapter) takes on a power strip or the wall socket
> when you plug it in.
> Generating all the internal voltages yourself from mains has the
> advantage that you can filter the mains, use linear or switching
> regulators to create your voltages, and not have some unknown
> frequency and amplitude of possible switching noise from a customer's
> wall wart regulator.
> I do like the idea of re-using a needless adapter though.
> On 5/14/19, 3:15 AM "Frédéric (Opensource)" <marzacdev at gmail.com> wrote:
> Hi everyone.
> I have not written here for a long time but I keep reading
> the list because of the interest of the topics.
> I am shared between two concepts for the power supply
> of a 19" rack and I would like to hear your opinion both as
> musicians and as instruments makers.
> _Option A: mains_
> Offering a regular 220V / 110V / 100V C14 input at the rack.
> pre-certified switched mode power supply (which adapt for all
> * C13 cables are common and available
> * No need for an external wall adapter
> * Musicians seem to like this (my impression)
> * Certification process (more complex and costly)
> * Design risks (mains inside / grounding / security for users and
> * Big additional cost
> _Option B: all in_
> Offering a regular 2.1mm DC jack connector that can accept ANYTHING
> like DC/AC from 6V to 16V.
> rectifier + small DC/DC converter or linear regulation
> (depending on the consumption and dissipation of the circuits)
> * Everyone owns needless adapters that could be reused
> (= environment friendly / less e-waste)
> * Less design complexity
> * No mains inside the rack
> * Simplified certification process
> * Need an external power adapter
> * Need a power adapter that works for the region where the machine
> is used
> (simple wall transformers often cannot travel)
> * Musicians don't seem to like it (my impression)
> What would you prefer?
> PS: By the way, last hours for the Buzzzy! on Kickstarter:
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