Hi guys,
I need a bit of help to identify the IC on a cheap Chinese PWM motor controller I bought on ebay a while back. As you can see from the pictures the markings have been scratched off for some reason!
I am trying to include a soft start function to the PWM so I can add it to my observatory dome control as the motor is too harsh on startup.
I have got a sort of soft start to work by adding a 470uf cap across 2 terminals on the speed control pot (see picture) but this is no good for my application as the PWM controller needs to be powered up all the time and connected to 2x DPDT relays to change motor direction(the relays are controlled by a K8055 USB board). So my solution only works on first power up until the cap charges, I need something that works everytime the motor is connected.
I have searched the internet for an IC that matches but can't find anything that has Ground on pin11 and the orientation marks on the chip don't match any of the data sheets I have looked at.
I have added a couple of pics of the PWM controller and a schematic of my observatory control system with a note on where I think the PWM needs to connect. I only need to slow the motor down at startup as it runs at the right speed when operating.
Any ideas would be much appreciated.
Thanks for your time
Richard
I need a bit of help to identify the IC on a cheap Chinese PWM motor controller I bought on ebay a while back. As you can see from the pictures the markings have been scratched off for some reason!
I am trying to include a soft start function to the PWM so I can add it to my observatory dome control as the motor is too harsh on startup.
I have got a sort of soft start to work by adding a 470uf cap across 2 terminals on the speed control pot (see picture) but this is no good for my application as the PWM controller needs to be powered up all the time and connected to 2x DPDT relays to change motor direction(the relays are controlled by a K8055 USB board). So my solution only works on first power up until the cap charges, I need something that works everytime the motor is connected.
I have searched the internet for an IC that matches but can't find anything that has Ground on pin11 and the orientation marks on the chip don't match any of the data sheets I have looked at.
I have added a couple of pics of the PWM controller and a schematic of my observatory control system with a note on where I think the PWM needs to connect. I only need to slow the motor down at startup as it runs at the right speed when operating.
Any ideas would be much appreciated.
Thanks for your time
Richard
Attachments
-
111.4 KB Views: 36
-
123.8 KB Views: 45
-
178.1 KB Views: 33