Agreed, with most FET's, you are limitted to 20V without having something to drop the voltage down. someone wanting to run 24V would need to supply a lower voltage to the FET driver from someplace else or provide a simple source such as from a 7812/7815 or resister + zener since current is minimal.
As I said in that posting, it's at least worthwhile to run a test with existing boards by wiring something in where the FET resistor is for testing purposes. That will help quantify the actual effect of driving a higher voltage with the existing FET, which is why I brought it up so you can test & decide if it is worth the effort.
Of course another circuit I didn't mentions is using a transsitor, since I'm biased to an opto-coupler and transistors don't save much space compared to an LTV-827.
Since I am looking at making a version of the board optimized for > 2A motors, and I don't have a major price jump if I'm greater then 10x10cm, I'll be playing with slightly larger layouts. I'm also biased to US PCB mfg instead of China, so the boards will be more expensive anyways, but I know they will be made to higher tolerances and no noticable extra cost for 2oz copper runs which will help for current and heat (I haven't checked the pricing on 3oz or 4oz from my favorite fab yet). This project is why I've been reviewing the design for ideas.
As I said in that posting, it's at least worthwhile to run a test with existing boards by wiring something in where the FET resistor is for testing purposes. That will help quantify the actual effect of driving a higher voltage with the existing FET, which is why I brought it up so you can test & decide if it is worth the effort.
Of course another circuit I didn't mentions is using a transsitor, since I'm biased to an opto-coupler and transistors don't save much space compared to an LTV-827.
Since I am looking at making a version of the board optimized for > 2A motors, and I don't have a major price jump if I'm greater then 10x10cm, I'll be playing with slightly larger layouts. I'm also biased to US PCB mfg instead of China, so the boards will be more expensive anyways, but I know they will be made to higher tolerances and no noticable extra cost for 2oz copper runs which will help for current and heat (I haven't checked the pricing on 3oz or 4oz from my favorite fab yet). This project is why I've been reviewing the design for ideas.