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Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
So, this is the schematic of the driver (The beta test board for Easternvoltageresearch)
While at the geek group, in a sun lit room at 5-cycle primary current, we could see 5ft easily to air. At night, it may have been 6-7ft (dull streamers hidden due to light). The coil did well and ran 10 minutes solid without heat issues. I call it a good run.
We put music to the fiber. Using a Audrino, we played music. The duty cycle on his thing (Paul Kidwell's) was really low, so the sparks were small. My coil occasionally popped high duty cycles, like 50%, especially when the music stopped, and it replayed. This happen 5 times, and it died. We were sure it was the cm300, further inspections reveal 2 things.
1) the variac 25A fuse was dead. 2) A TVS diode was shorted on Gate 2 of the CM300. The backup zeners (0.7V higher) lived.
After replacing the TVS, the system is still in full operation.
To the point. Why did RF to that MCU, cause the system to spurt out 50% duty shots? I have my duty limiter set to 5 cycles, Why is it bypassing it? How can I fix it? I'm lucky my coil lived and im happy it runs really good. Im just ticked the RF or SOMETHING can bypass the PWM limiter!
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
can you get a scope picture of the ofending gate. what is the tvs clamp voltage? the 1.ke series can only take 7w. do you think that the tvs is clamping all the time or is it procautionary?
Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
Its a 1.5ke33CA I believe. I recently ordered more. It was a short, so it's safe to say it had to die when the fuse did due to rf spikes. Else I don't think the system would have been working.
I have to rip things apart tomorrow to replace the tvs. Do you want me to scope the signal without a gate (cm300) load? Or with the gate connected? Whatever you want to see let me know and I'll snap some pictures.
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
Good lord, I don't think EVR could have copied Steve's UD any better if he tried.
With that being said, I would try and fix the problem with the musical controller. When you put a system in to detect things like over current and over duty there job is to catch rare events not act as a permanent duty limiter for signal to large in the first place.
What I would do, check to see if it's the musical controller that is sending out the 50% pulses or if it's the coil. IT would be rather easy to determine this by scoping both before and after the 74LS123 and try to "catch" a glitch event. This will tell you real fast whether your limiter is at fault and also whether it's the musical controller or the coil.
Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
The mcu wasn't boxed due to raw testing but I have done similar in the past with my computer to an led light for fiber. Getting good sounding low duty notes, but some of the low Ives caused it to spurt out 50% or so. As for the coil itself, that's fully heavily grounded.
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DRSSTC - PWM limiter got bypassed?
