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so to be clear, I need to make this folder. it is not one that should already exist?

I get the general principle of inputs in your MESA cards, I understood. You have made a very simple and easily understable manuals with you cards, btw.

But I am trying to solve simmilar inputs possibilities in one of my arduino wirings. I would like to have a little universal solution like you have on 7i96 cards, not just TTL as usual, but cant figure out what parts is best to use to achieve this.

What caused the original failures ?
Are the existing motors good or are they the cause of the initial failures ?
I've lost count of how many times a tech has replaced the failed component is a system, not investigated why it went only to destroy the custom ASIC they just replaced.

Goto the gecko drive home page, they have some great stuff about stepper motors and drivers, and it's broader than just their own products
After becoming wiser pick drivers that match your motors, don't guess.
Carefully set one axis up, don't take any shortcuts or do anything additional you think is right, this would seem how you got into this mess.
The drivers are going to come from china, probably the same factory, only thing that may change is the silk screen on the front cover.
I've bought from stepper online, sellers from eBay and from aliexpress, no issues as long as you take care as would with any other job.
Do one axis at a time, thereby only having to debug one axis, wire the rest up the way you do the first one once it's works and you'll be fine.
Spend time doing research, you'll be wiser for it, you'll do a better job, you'll stop wasting money.
And for crying out loud keep your soldering iron away from the drivers.
If there is an area you are not totally grounded in get an expert in and don't suggest to them how to do their job.

Typically you can only use mixed voltages with sinking inputs (input common grounded)
In this case, any positive input voltage from +5V to +36V will be detected by the 7I96
isolated inputs.
 

Hi PWC will any 5-axis bob work with this firmware? The Sainsmart boards are hard to get in the UK