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RE: [TCML] Home-made modulation transformer/guitar-driver (VTTC)
Can't wait to see this creation my friend.
Are you planning to use that 304th?
Let me know if you need parts...I have some of everything.
Question...since the frequencies you'll be modulating will reach up past
1khz, will the MOT core transfer these frequencies with any sort of
efficiency?
Perhaps you'll need a crossover to split the frequencies from your
guitar into two modulation transformers with different core types..ran
in series? Just a thought.
Shannon
KII
"Failures are divided into two classes
those who thought and never did,
and those who did and never thought."
John Charles Salak
-----Original Message-----
From: Christopher Karr [mailto:chriskarr4@xxxxxxxxxxx]
Sent: Thursday, April 22, 2010 9:01 PM
To: Tesla Pupman List
Subject: [TCML] Home-made modulation transformer/guitar-driver (VTTC)
Hello 'Everyone,'
In a MOT-powered VTTC, would it suffice to make a modulation transformer
out of, essentially, another MOT (driven by a 100W guitar amplifier)? If
so, would using the original secondary winding and a new primary winding
- with fewer turns - be the preferred method? This would, of course, be
placed with the bias of the guitar amplifier opposing the flow of
anode-current.
Assuming this might work, in the first place, how might one 'force' the
VTTC to respond only to their amplifier, in order to prevent the 'hiss'
of CW 'sparks?' A biasing DC supply saturating the core on the primary
side? Or would this even be necessary, since the high-voltage DC energy
from the primary circuit of the VTTC would saturate the core? Perhaps
the varying current-draw would act to cause flux-collapsion?
Or, perhaps using an IGBT rated at 600V on the grid-circuit is the only
reasonable option?
Perhaps a pair of IGBTs (rated at 1200V each) with their collectors and
emitters in series and gates in parallel is a possibility for post-tube
(high-side?) modulation..
Input and knowledge is very much appreciated, everyone!
Thanks,
- Christopher Karr
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