Thread: PSU : prices and differences
That cap you have linked to looks like 63V rating to me used with the transformer that you linked to would that not be a bit low? ... Clive
You linked to Caps but didn't say how much capacitance is required or even mentioned the fact more than one cap can be wired in parallel to reach desired capacitance.
You haven't mentioned resistor for draining the caps.
Your lack of full information is dangerous and your playing with other peoples lives and expensive hardware.. . Give it all or shut up.!!
The rest of the information is mentioned in plenty of other threads by myself and others. It's not hard to find and I thought saying the 'main things' along with the ellipsis at the end of my post makes it clear that I'm giving a brief overview.
Last edited by Jonathan; 26-08-2013 at 07:50 PM.
I'm not doing it and will stick with the personal touch so I now the person I'm helping fully understands what they are doing.!
Guys, lets not start WW3, ok.
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.
I'm willing to have a stab at the words and there's a good working schematic that I drew in the thread I linked to.
What say you?
Two versions depending on whether the transformer secondaries need to be placed in series or parallel to obtain the correct voltage. Two capacitors pictured, but more/less may be needed in some cases. I put in the NTC thermistor for soft start, which is optional for most size transformers in this application. I see no reason to put a fuse on the output since all the drivers I've dismantled (PM752, PM542, DQ860MA, AM882, 2M880N) include their own individual fuses, however it may be sensible to include one in case somebody decides to use the power supply in a different application.
Remember the target audience is new comers and they don't want rocket science maths just plane simple information, more than this and it complicates things and puts them off which really shouldn't need be the case for building such a simple thing.!
Last edited by JAZZCNC; 26-08-2013 at 09:10 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