I have benefited greatly from the various MC2100 discussions here. Thank you all.
I have built the circuit that uses two 555 timers, and can control the MC2100 with a potentiometer without trouble.
My end goal is to use this on my CNC mill to control the spindle motor. I use a Gecko G540 as the driver for the mill. The only spindle speed signal I can use from that is a voltage range, you give it V+, ground, and get back a voltage in the middle corresponding to the speed for the spindle. the same as using a pot as a voltage divider.
The problem is that the voltage to control that 555 circuit is reversed, in other words a higher voltage makes the motor slower. Also it seems the max voltage is right around 5 volts instead of the 12 that I get from the mc2100.
Since I am an electronics noob I am wondering how to invert the direction of that voltage range? I don’t know how to reverse it such that rising voltage from the mill driver is turned into falling voltage. Spent quite some time on google for this, but didn’t find a clear answer
Anyone?
I have built the circuit that uses two 555 timers, and can control the MC2100 with a potentiometer without trouble.
My end goal is to use this on my CNC mill to control the spindle motor. I use a Gecko G540 as the driver for the mill. The only spindle speed signal I can use from that is a voltage range, you give it V+, ground, and get back a voltage in the middle corresponding to the speed for the spindle. the same as using a pot as a voltage divider.
The problem is that the voltage to control that 555 circuit is reversed, in other words a higher voltage makes the motor slower. Also it seems the max voltage is right around 5 volts instead of the 12 that I get from the mc2100.
Since I am an electronics noob I am wondering how to invert the direction of that voltage range? I don’t know how to reverse it such that rising voltage from the mill driver is turned into falling voltage. Spent quite some time on google for this, but didn’t find a clear answer
Anyone?