Author Topic: DDCSV VSO to pwm spindle control  (Read 87 times)

Offline picclock

  • Hero Member
  • *****
  • Posts: 548
  • Country: gb
DDCSV VSO to pwm spindle control
« on: March 15, 2019, 09:44:01 AM »
Hi
Does anyone know where I can find details of how to change the analogue spindle output, VSO, to pwm. I am sure I have read about it but alas cannot find it. If I remember correctly it involves removing a capacitor from the board, but I cannot find the details.

I am working on an interface between the DDCSV and a brushless motor controller but it needs to be pwm.

On my brushless controller the control pot sits at ~140V dc above gnd. The motor stops below 0.6V, max speed at 5V. The speed is controlled by a 5K pot which has its top end supplied with a 5V regulator (7805), which I shall use to power the circuit.

Initial schematic below.

Best Regards

picclock

Apparently I don't need the transistor pull down shown in the schematic as the controller board already has a 1k pulldown.
« Last Edit: March 18, 2019, 04:36:06 AM by picclock »
Engaged in the art of turning large pieces of useful material into ever smaller pieces of (s)crap. (Ferndown, Dorset)

Offline picclock

  • Hero Member
  • *****
  • Posts: 548
  • Country: gb
Re: DDCSV pwm spindle control
« Reply #1 on: March 17, 2019, 02:50:17 AM »
I have managed to find the original article I read on how to do this on facebook. It includes a schematic of the VSO output and the location of the capacitor to be removed.

https://www.facebook.com/groups/1724999967517167/permalink/2355817094435448/

Best Regards

picclock
Engaged in the art of turning large pieces of useful material into ever smaller pieces of (s)crap. (Ferndown, Dorset)