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View Full Version : Low current stepper drivers with screw terminals?



m_c
04-08-2018, 12:04 PM
For the next part of the Roland retrofit puzzle, I'm looking for some low current stepper drivers.

I had thought about some TB6xxx's given their low cost, but I'd like something with a bit more current adjustability, as I'm not sure what current I'll need, and the 0.5A jump in settings seem a bit high.

The original chips are TEA3718, which have a maximum current of 1.5A, but I'd guess are being pushed no where near that hard. Unfortunetly I can't seem to work out what current they're set to use, as the datasheet doesn't list any clear cut formula, and the final current is a result of motor feedback and resistors.

I've had a look at the 3D printer options, and although things like the Polulu and DRV8825 stuff ticks the boxes in terms of voltage/current adjustability, they're all DIP mount.

Any other cheap options to consider, or are some TB6600's and hoping 0.5A is good enough the most convenient option?

magicniner
04-08-2018, 05:38 PM
Go for the DIP mount drivers and use a section of strip board?
You can add your own screw terminals.

m_c
05-08-2018, 11:28 AM
I'm thinking that may be the best option, and the project may be creeping towards a custom PCB to mount everything neatly.

Unregulated 36V PSU bits, spindle power relay, and stepper drivers on one board with screw terminal headers would be nice and tidy..

cropwell
05-08-2018, 11:34 AM
I'm thinking that may be the best option, and the project may be creeping towards a custom PCB to mount everything neatly.

This any use ? https://www.ebay.co.uk/itm/DIP-Component-to-Screw-Terminal-Block-Adapter-Board-PCB/151941763891?_trkparms=aid%3D555018%26algo%3DPL.SI M%26ao%3D2%26asc%3D20160908110712%26meid%3D1bb5694 85113416996bfa5148f87c867%26pid%3D100677%26rk%3D1% 26rkt%3D11%26sd%3D151941806068%26itm%3D15194176389 1&_trksid=p2385738.c100677.m4598

Or this ? http://www.keyestudio.com/shop/shield/keyestudio-a4988-3d-printer-stepper-motor-driver-cnc-shield-v3.html

m_c
05-08-2018, 06:57 PM
Those breakout boards are an option, but not something I'd normally use for a finished item.

I'm currently veering towards a custom PCB to mount the 3 stepper drivers, and the unregulated PSU bits (bridge rectifier + big capacitor), then use a DDCSV for control, which should result in a relatively compact control box that can be dragged out when needed.