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Topic: Bench power supply suggestions (Read 5950 times) previous topic - next topic

larryd

Dec 26, 2016, 09:55 am Last Edit: Dec 26, 2016, 09:58 am by LarryD
I plan on engraving panels for a bench power supply.
Any suggestions on other things to add or change welcomed.

The DB09 connector will have the +-12, 0V and +-5V outputs.




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ElCaron

Stupid question: Will this be metal? Are the banana connectors isolated against the plate?

larryd

#2
Dec 26, 2016, 06:55 pm Last Edit: Dec 26, 2016, 07:02 pm by LarryD
The front and back panels will be made from .064" acrylic plastic.
The banana jacks are plastic, similar to these:


The USB jack is this one:


Edit the AC outlet is this:


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Boardburner2

The front and back panels will be made from .064" acrylic plastic.
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Is that for legend or mounting ?

Problem i used to find was with odd shaped holes, D types etc , lots of filing or expensive punching operations were needed.

Laser cut acrylic with etching works well and not too dear these days.


larryd

#4
Dec 26, 2016, 07:49 pm Last Edit: Dec 26, 2016, 07:57 pm by LarryD
I will be using carbide D bits, 10 degree angle, cutting with CNC tool :



This is close to final version, .064" thick, material is black cut white lettering.



Blue is cut out.
Red is labeling.
White is hidden behind or the front outline of the part.




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borland

#5
Dec 26, 2016, 08:05 pm Last Edit: Dec 26, 2016, 08:11 pm by borland
But no 3.3V DC supply?

I was looking at bench power supplies on eBay, and see 0-30VDC, 5A ones from China for less than $40 USD shipped. These have adjustable constant voltage/constant current modes, and over-current protection.

If you want to build a adjustable bench supply, there are XL4015 adjustable buck converters with output adjustable voltage and current (CV/CC), up to 5A output for about $4 USD shipped.  These are usually advertised as a "Lithium Charger 5A Step Down Power Supply Module", but not a very good idea to use them for that since they don't actually shut off when battery is fully charged, so that could cause battery degradation if left unattended.

For about another $7 USD, you can add a DC watt meter (volts, current, power), commonly used by RC hobby with 4-digit current/voltage resolution.  Use those with one of the brick AC adapters from a laptop (20VDC, 4.5A).

larryd

#6
Dec 26, 2016, 08:36 pm Last Edit: Dec 26, 2016, 08:37 pm by LarryD
Yes, 3.3v would make this ideal, the open frame supply shown in the opening post has +-12 and +-5v.



I got one of these for$140, a good value.  2X 0-30v 3amps and 5v 3amps, CV CC.
Series and parallel mode giving 0-60v 3amps or 0-30 6amps.




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larryd

#7
Dec 26, 2016, 10:44 pm Last Edit: Dec 26, 2016, 10:44 pm by LarryD
@borland

Thank you, added 3.3V, I will use a buck converter 5 to 3.3V converter.



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tinman13kup

Looks like you are running out of room. You seem to have all the major things covered...+/-12V, +/-5V, 3.3, outlet to plug in coffee pot, ...

Is this going to be a remote panel? That's something I could get into.

I'm always looking for ways to open up more room to work with and cable control. I've been playing with a ic proximity chip and will put some on/off touch buttons under black glass just as soon as I finish the circuits.
Tom
It's not a hobby if you're not having fun doing it. Step back and breathe

rogertee

what is missing is a variable voltage and a panel meter your going to end up building another for 0-36 volts but if you plan to experiment with op amps there is +- voltages

larryd

#10
Dec 27, 2016, 04:52 am Last Edit: Dec 27, 2016, 04:52 am by LarryD
I cut out the panels and installed the components.
I think it tuned out well.




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larryd

#11
Dec 27, 2016, 04:53 am Last Edit: Dec 27, 2016, 04:53 am by LarryD


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CrossRoads

That turned out sharp, nice work Larry.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

larryd

Thanks Bob.

I had four of these power supplies sitting around for 15+ years gathering dust.
Decided I need to use it or lose it.

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rpt007

Very nice work, Larry!
What kind of material did you use for the front and back panels?

I am planning to do something similar with a universal power supply with different voltage output plus for HV tube experiments using a 1:1 transformer ( in my country 230V/230V) to isolate from direct mains supply.

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