Triac PC Linuxcnc

[Doddy]

John,

You've peaked my interest. 0-8.5V... On the image of the isolation 0-10V board that I'd linked on Amazon - noting you could have ordered a different device, or the device delivered may well differ from the images... that withstanding, the image shows the PCB with a number of devices on the board. There's the LV side, and the HV side of the board. Behind the terminals on each side there's a large 3-pin TO220 device (big blob of black plastic, 3 pins to the board, and a metal tab on the arse-end for bolting to a heatsink if required. I'm guessing - and it is a guess - that these are series regulators. Could you check for a part number on the front face of these for both LV and HV sections. There's usually a couple of numbers at play - the lower one typically a date code, and the upper one typically the device part number. I'm guessing this may be of the form "LM7809". That number could help determine the options for adapting the output voltage swing. Also of interest - there's a 8-pin surface-mount device on the HV side (and another on the LV side) - the part number for that would also be of interest. Finally, there's a device straddling the LV/HV sections - looks like a 8-pin Opto-Isolator but could be something a little different - if that's not obscured by a QC sticker, then that part number is also interesting.

I'm wondering, if you currently have a 0-8.5V output, would that be better for you as 1.5-10V? (i.e. with a 1.5V offset) - to remove the very low speed control and give higher top-speed control?

There may be (and I've not checked) support with the Sprint board to calibrate to a max voltage for max speed - might be worth checking as well.