[Swansea Hackspace] bench power supply

[Andy Davies]

I am using this one 
https://www.digikey.co.uk/product-detail/en/leddynamics-inc/A011-D-V-700/788-1038-ND/2720722

to drive the LED for my microscope but the dimming using a pot is not very 
good as the LED can't be turned down to a low enough brightness.

-----Original Message----- 
From: Justin Mitchell
Sent: Friday, August 10, 2018 1:27 PM
To: hackspace at swansea.hackspace.org.uk
Subject: Re: [Swansea Hackspace] bench power supply

On Fri, 2018-08-10 at 12:46 +0100, Andy Davies wrote:
> Thanks for spotting that the current control is adjusted with a
> screwdriver
>
> Is there any way to tell from the specs whether I am going to get
> flicker that would show up on video? i.e. does the ripple give a
> clue?

A bench PSU is a regulated output, it should be nice and smooth.

afaik constant current drivers should likewise be a smooth output.

It just sounds a bit odd and overkill to require a bench psu to run an
LED, even a big one, smoothly.

its only really cheapo recitifier+resistor, or capacitive droppers that
i would expect there to be significant flicker, the kind of circuit you
find in cheap LED bulbs. See Big Clive's videos on exactly how crude
some of those can be.




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