Testing Servos

[Drools]

I'm looking for a simple circuit to test my servos. Not a full driver just a PWM generator I guess. I'm new to servos so please correct me if nothing like this exists. I use Atmel m48/168 I think they can produce PWM output but is there must be more to it?
Thanks for the help, I'm just trying to learn.

[Drools]

I have several of these motors.
COPAL
PN12-60119-01
I found this on the net.

Re. the Copal motors extracted from those old Compaq 15/30 DLT drives, part number LBT79-002 and possibly the -001 variant and others with the 9-pin connector. I've got them going they need +12 and +5V supplies (logic and power). Here's the pinout. Pin 1 = Motor drive enable 0=Off 1=On Pin 2 = Gnd Pin 3 = Direction control 0=CCW, 1=CW Pin 4 = Output from sensor A 2.5V centre Pin 5 = +12V In Pin 6 = Gnd (internally connected to pin 2) Pin 7 = Output from sensor B 2.5V centre Pin 8 = Output from sendor C 2.5V centre Pin 9 = +5V In Connect a 1.5K resistor between pins 2 and 3 to ensure reliable switching, else pin 3 floats at 1.7V and the motor is unstable. It may be possible to pulse width modulate the motor enable (pin 1) to get speed control. -A

I have one powered up and I measured the no load RPM at 2700. I'm not sure these are even worth playing around with but I should be able to learn about servos by playing with these.
When they are not bolted down they will kick off the table when switching direction. Obviously applying 5VDC to pin 1 is making the motor turn at full speed but I know for sure the RPM of these motors can be varied because I have used many a DLT drive at work over the year. They are obsolete now except for the very high end units, therefore the older units are easy to come by.

Is there a way for me to generate a PWM signal to test this motor?
Thanks for the help everyone!

[Drools]

Well touring around the net I found this. What a wealth of info on these motors. It is in german but the google translator does an ok job at getting the info out in english.
Google Translate
This site has a slightly different wiring diagram for the motor, they say a PWM signal can be applied to PIN3.

[Drools]

I have one of these boards that I use to control the speed on my Porter Cable router. I use a pot and not the Mach3 input but it says something about PWM.
CNC4PC

[arturod]

Brent,

I am not sure where you are trying to get to.

If you just need a PWM that can be used to control the motor, you could do it with mach3. See how an spindle can be controlled with mach3. The C29 that you got can also be controlled with PWM.

Arturo Duncan
:: CNC4PC :: iNtRo