Thread-topic: Eastern Voltage Research VTTC Staccato Controller - puzzled on "burst" output
Hi Chris,
I have never figured out what the burst mode pot actually does. I can see the 1,2,3 burst pattern on the scope but it has no observable effect on the streamers. The burst/CW switch is indeed bogus. You can get basically the same effect as CW by rotating the burst mode pot completely CCW even though it is not true CW. I was going to modify the board to make the burst/CW switch truly CW but I ended being satisfied with just rotating the burst mode pot completely CCW. I asked someone at Eastern Voltage Research about all of this and the person that I communicated with by E-Mail basically stated that the burst mode pot was worthless. He also said that they designed it so long ago that no one really remembers all of the details about how it works.
Despite these quirks, the interrupter does supply a variable PRF and variable pulse duration that works. The one problem that I have with it is that at some settings the streamer sound is "snappy" and produces some tiny offshoot branches instead of swords. This may be a problem with my VTTC though so I can't say for certain if it is the interrupter. Do you get any "snappy" non-sword settings with yours?
Steve White
Cedar Rapids, Iowa
----- Original Message -----
From: "Chris Reeland" <chrisreeland@xxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Sunday, October 13, 2019 2:26:00 PM
Subject: [TCML] Eastern Voltage Research VTTC Staccato Controller - puzzled on "burst" output
Hi all.
Starting a few weekends ago, off and on, I have decided to finally put this
kit together and also put this in an enclosure with all external controls.
I have had this for a few years now... decided it is time to try it or it
may never happen...
Pretty pleased so far. Got it running with no mistakes made putting it
all together.
Was a pain somewhat wiring all external controls and squeeze everything
inside my enclosure.
As far as I know, everything looks good when I scoped this first before
actually hooking it up and running on my 304 VTTC.
I ran this late last night on my coil for the first time. Everything works
pretty much as expected, except the adjustable "burst" settings.
It has a normal 1 pulse. Then the "bursts" are a 2 pulse and a 4 pulse. And
the PRF rate is adjustable on all. All looks good on the scope, but when
actually running the VTTC, it "ignores" the "bursts" and runs just as if in
normal 1 pulse mode.
So a bit puzzled currently. I was wondering if some others has this kit,
and if their "burst" mode works as expected.
I know Steve (White) has this and I think Forrest has this also. If you
fellas could let me know if yours works as expected, I would greatly
appreciate it and if anyone else could chime in.
Also I see what Steve was talking about a few years past about the "bypass"
switch. It is the what I would call a "60Hz Sync" and PW is adjustable. If
I remember correctly (currently I can't find his old posts on this) he was
wanting it to actually do "CW". But for me I am okay with this. But I
agree this should not be called a "bypass".
Going to try some more things here currently right now...
I will post some pictures later of it in the enclosure and the layout of
the inside.
Chris Reeland
Ladd Illinois USA
Sent from my LG V20
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