Thread: PSU : prices and differences
You both have valid points and all the info is out there including the thread I linked to. BUT none of this in the right form for a newbie to electronics at this level. What we need is a properly structured tutorial to help answer the question 'how do I build a linear PSU for x volts' with a 'best practice' design, a schematic and assembly guidelines along with photos of good - and, maybe, bad - examples.
That would be greatly appreciated, i for one am Electrically Challenged and couldn't even contemplate a build without some assistance from you guys.
All this week I was looking for information related to DIY PSU,
and found this assembled power board : PMDX.COM - Products for CNC and motion control applications
AC input 18-35 volts
DC output 24-50 volts and up to 10 amps
It seems that this is what I need for my Gecko drivers,
but one thing I can't understand, see pics from manual.
If I good understand, so I have to choose 30V/AC transformer if I want to stay on safe side, but at the same time lose some power?, or I'm ok with 35V/AC ?
If your unsure then has a guide just check the voltage coming into building, if it's on the high side then go for the lower transformer to be on safe side.
There actually 33Vac transformers which will suit better see below. 2x33 will give approx 45-46Vdc and 500Va will give approx 7.5A or 625Va 9A
Chassis mounting toroidal transformers
Last edited by JAZZCNC; 01-09-2013 at 09:17 PM.
The Following User Says Thank You to JAZZCNC For This Useful Post:
So with a 230V to 33V transformer, using the 10% tolerance and 1.1V drop for rectifier, you can expect up to 33*1.1*1.414-1.1=50.2V. Granted that's not likely to occur at all often, but it is over the rated voltage of the drivers so using the 30V transformer is would be less of a risk. If using a 35V transformer (i.e. the spare one I had) then I'd add in some extra diodes or a linear regulator circuit to keep the voltage within the specification.
The Following User Says Thank You to Jonathan For This Useful Post:
I think the 33vac will be fine because the G540 Gecko can handle more than 50Vdc for short bursts and it's very unlikely you'll ever get near that voltage.
Last edited by JAZZCNC; 01-09-2013 at 10:06 PM.
one minute ago I checked the voltage in the house, it was 236-238V
Fun fact - if you have solar panels on the roof the mains voltage in your house will rise a little on a sunny day. I've noticed this effect after putting 1.14kWp of panels on the shed adjacent to my workshop...
Last edited by Jonathan; 01-09-2013 at 10:32 PM.
By deannos in forum Marketplace DiscussionReplies: 15Last Post: 10-12-2012, 09:25 PM
By ecat in forum Gantry/Router Machines & BuildingReplies: 1Last Post: 15-03-2012, 01:57 PM
By John S in forum General DiscussionReplies: 3Last Post: 25-09-2011, 11:13 AM