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Rotating monitor construction *Project finished*
theCoder:
One possible reason why you have not had many downloads of the code is there probably is not that many people building a rotating monitor systems at this time. Also, "DOS only" may be an issue. Over time, you'll probably get plenty of hits.
Great job on documenting the project. This should help someone else out down the road.
csa3d:
--- Quote from: theCoder on December 03, 2007, 01:58:02 am ---One possible reason why you have not had many downloads of the code is there probably is not that many people building a rotating monitor systems at this time. Also, "DOS only" may be an issue. Over time, you'll probably get plenty of hits.
Great job on documenting the project. This should help someone else out down the road.
--- End quote ---
I agree with both statements. I can tell you that I'm following every update in this thread on a surface level, and am sure if/when I get around to motorizing like I'd like to, this thread will become invaluable. Thanks for being as detailed as you have been.
-csa
DaOld Man:
Thanks for the kind comments.
One of the power transistors failed on my H Drive. I was testing my circuit on the DOS machine. The drive wasnt being told to come on, but I noticed the motor turned about a quarter turn then stopped. Then I noticed one of the transistors got very hot, then the AT power supply shut down. I tried to shut it off when I noticed the transistor was hot, but I guess I wasnt fast enough.
Now whenever I hook power to the H drive it shorts out the power supply.
I think one of the transistors shorted, and took out it's opposite mate.
I guess Im glad it did it now instead of after I had in mounted in the cab and using it.
I plan to tear it down sometime today and test the transistors. I am thinking I may have stressed the transistors when I was playing around with PWM on them. They got pretty warm then. (See a previous post.)
I also am taking the H Drive inputs to 12 VDC + through 5 K ohm resistors. I may need to use much higher resistors. (I plan to experiment with the drive when I fix it to see if I can use much higher resistors.)
Now I need to order more transistors, or I am thinking of building a drive from two relays.
The relay drive could be a demonstration to those wanting to go that route.
The relays would be more expensive than replacement transistors, and I "just like" the H drive. But relays would be much more rugged and since I dont plan on using speed control, the PWM wont be an issue.
javeryh:
--- Quote from: csa3d on December 03, 2007, 08:47:22 am ---
--- Quote from: theCoder on December 03, 2007, 01:58:02 am ---One possible reason why you have not had many downloads of the code is there probably is not that many people building a rotating monitor systems at this time. Also, "DOS only" may be an issue. Over time, you'll probably get plenty of hits.
Great job on documenting the project. This should help someone else out down the road.
--- End quote ---
I agree with both statements. I can tell you that I'm following every update in this thread on a surface level, and am sure if/when I get around to motorizing like I'd like to, this thread will become invaluable. Thanks for being as detailed as you have been.
-csa
--- End quote ---
Same here. I'm definitely going to try this with my "Wife-Friendly Arcade" but I'm a ways off from actually attempting it. I have been following the progress here and I will be asking a ton of questions when I actually start. Thanks for keeping such a detailed account of your progress... :cheers:
DaOld Man:
I had to loose the 4 leds on the right side of the board. Seems these were dropping the voltage to the opto isolators and making the circuit do some crazy things. I think it was oscillating, outputs turning on and off very fast. This might have been what fried my H drives transistors.
With the leds out, the circuit appears to be a lot more stable.
Also I found a bug in my drotate.exe program. Its not reading the inputs correctly.
So Im removing the download from here, will re-post it later when I have time to figure out the bug in the program.
Now I need to order some more transistors for the H drive..
Man this project is going to wind up costing me more than I got in the whole arcade cab (LOL), Well, it's no where near that right now.
Ive got two 3PDT 12 volt relays in my junk box, maybe I will throw together a relay drive.
I know the opto isolators will turn on the relays, I have already tested that.
So, I may have some new pics soon! (Wish me luck, everything I touch lately has let smoke out of something.)
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