PMINMO 297/298 boards

[irving2008]

Just a thread to show these boards, and my build. Not the latest technology but cheap parts and cheap to assemble

Boards available from Phil Moore, more info here and buy from here

Parts sourced from Farnell except L297/L298 and the main heatsink which were from Cricklewood Electronics as they were cheaper and I was passing. The main heatsink was one piece, chopped into 3 with a hacksaw and tidied up with a facemill on the Warco (cutting chips at last!)

First, a pic of the stepper driver board:

[irving2008]

Phil likes using SMD chip capacitors on his boards.

Here is a technique for holding the capacitor against the board while soldering, using a device constructed from a clothes peg and some coat hanger wire (nothing Heath Robinson here...)

[irving2008]

Here is a view of the completed driver and breakout boards without heatsinks

[irving2008]

Final view fitted with heatsinks.

The large heatsink was bought a a bigger item, cut into 3 using a hacksaw then tidied up on my Warco (cutting chips at last) with a facemill.

At 36V and 1.5A the heatsinks are needed else both the L298 and the L317 regulator get too hot...

[audioandy]

Looks nice and neat Irving excellent job :clap:

[Ross77]

Ditto. Id be well chuffed if I could solder like that..

What are they like in use? Do the motors Buzz, hum etc.?

[irving2008]

Ditto. Id be well chuffed if I could solder like that..

What are they like in use? Do the motors Buzz, hum etc.?

only tried unloaded so far, but quiet as a mouse... faint whine if you listen hard...

soldering's easy - I did my time hand-building pre-production boards, many many moons ago!

[Ross77]

only tried unloaded so far, but quiet as a mouse... faint whine if you listen hard...

Happy days... Is that in full or half step?

When I tested my board,(simlar to PMINMO) at 1/2 step they squeeled like little piggys. (probably didnt help as the pulse came from me tapping a wire at o.5v onto the pin :whistling:) havent got around to trying it with the pulser you designed.

BTW. is that + 0r - edge output? I beleive the L297 requires a - edge.?