|
Wow! A free oscilloscope! Thank you, Mister-e! Now I must find an old sound-card....
"Probably the original design used MOSFETs, so the voltage loss was reduced to a minimum..." - I thought I was actually building the original design. You will clearly see +6v on the original circuit diagram. But I am now inclined to think you are right, and this circuit does not actually work as specified...
|
Well it has to work as expected with HIS OWN step motor... but how many different model is there in the world?
You can now buy a sound card under 20$ here... 1/10 of almost any decent used scope.
When i talked about the original design, i meant your previous one... not the one you found and post here.
Last edited by mister_e; - 28th March 2008 at 21:52.
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
|
"...but how many different model is there in the world...?"
He is using a standard chinese clock-drive for an EQ4/5 scope - so am I. I was expecting our motors to be identical....
"You can now buy a sound card under 20$ here.."
I have some separate sound cards already - I was assuming that you plugged the probes into the game port on them. But now I have downloaded VA, I see there is no info about where to connect the probes to at all. Do you connect the probe to the 'microphone-in'? If so, I can connect it to the built-in sound card on the motherboard of the system I am using. It is odd that there seems to be no information about this vital point...?
"When i talked about the original design, i meant your previous one.."
Sorry - I misunderstood. In fact, I still have the original handcontroller. My problem is not that it was broken, but that it drove the motors at the correct speed for an EQ4/5 mount (1/10 rpm) and I wanted to use it for an EQ3-2 mount (1/11 rmp). Those are the final speeds - there is a gear train of approx 200:1 between the scope and the stepper. The original controller used an Amtel micro, directly driving an array of 8 transistors. They could well be MOSFETs.
|
you plug your probe to in Line in, make sure you set your Soundcard Mixer properly as well.
In VA, Click on Settings>> In/Out Device to confirm your setings.
Trent, i can't tell, it worked for me awhile back, not sure about the current one...
EDIT seems that I had the same version... doesn't seems to bug here.
Last edited by mister_e; - 29th March 2008 at 00:21.
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
|
Try resizing some of the windows. Maximize the main GUI then restore, then manually adjust it. Sometimes messes real bad. Same problems with the tool windows too, like for the voltmeter.Originally Posted by mister_e
|
T Jackson "Your reference to the website incurred me to think you found this code rather than wrote it..."
You are right. I have copied this code directly off this website. That's why I am on this forum - because the website claims it works together with the circuit they provide, but I can't make that happen.
Having said that, I have found other sites where precisely the same circuit is used with similar code, so it seems that I am doing something wrong.
Mister-e - I can't make VA work either. I am not skilled in electronics, but expected to see a set of 6v steps if I put a probe on the output of this circuit and attached the ground to 0v. Instead, what I got was a sine wave. In fact, whatever I do, I seem to get a sine wave. The oscilliscope setup setup just seems to measure RMS or peak-to-peak - I can find no DC setting at all. When I turn the circuit on, the sine wave is interrupted by short pulses which decay to 0v rapidly, so if those are real I am failing to get a proper signal to the stepper coil, but since I can't even make the scope line jump up when I put 6v across the terminal I can't be sure that VA is working at all....
|
Excuse me? I think you might have mistaken me for someone else my friend. I have made no references to any websites in this thread.
|
Apologies for the confusion. What I meant to put over was:
I - refered to the website I got the stepper driver code I am using from (referenced in my first post.
You - said "Your reference to the website incurred me to think you found this code rather than wrote it..."
I - was trying to point out that I HAD found the code rather than created it.
However, I have now found out that no PC software-only scope using the sound card will provide a DC service, so I am no further forward...
Members who have read this thread : 0You do not have permission to view the list of names.
Posting Permissions
Bookmarks