PMINMO 297/298 boards

[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.?