stepper motors glitching

[irving2008]

I'd be wary of putting a 35v rating capacitor on there permanently, the back emf could easily get to 45+ volts and lead to premature capacitor failure.

Makig a linear power supply is easy. Its hard to find ready-made linear supplies as there's little market for them outside the CNC world. I'd be happy to take you through it, almost no soldering required!

[John S]

Right 3 axis at 2 amps each is 6 amps but as they are never running at the same time, and believe it or not they don't draw 2 amps then the rule of thumb is 70 % of total. However to give a bit of over head we'll say 6 amps at 30 -33 volts.

So we select a transformer in this case from RS because I'm idle and they deliver for free.
6 Amp at 25 volts #223-8207 £ 27.82

Next we need a capacitor 10,000uF 63 volt working #255-0232 £10.44

Then a bridge rectifier 15 amp 50 volt working #515-5559 £1.50

Now because it is smoothed by the capacitor and converted into DC that 25 volts now becomes 25 x 1.414 = 35.5 volts.

All these components above are either screw fixing or you crimp on spade terminals, no soldering needed.

[z3t4]

Genuine question here 'cos this is most definitely not my home territory. That transformer is 300VA (2x25V, each at 6A). Do you need 300VA, or are you just putting in a nice healthy margin?
I'm interested in this, having seen the telecoms PSU's on the 'bay* at 13 quid for 50V @ 9A. Was already to unlock the safe and trade in some beloved Jaffa cakes, but it's a SMPSU so after this thread I'm not so sure.

*Item number 380071301709

Cheers,

John