Flanging sound coming from DRSSTC at certain PW

Coileone, Thu May 12 2022, 06:14PM

Good Afternoon,

I'll try my best to describe this as accurate as possible.

When I turn up my pw to around 500-800 us @ 50 bps, I begin to hear a flanging sound. The sound starts out with a higher pitch flanging sound and progresses to a lower pitch as I turn up the pw further. At around 700-1ms, the sound is gone and doesn't return if I continue to increase the pw further.

The same thing happens with 150bps, but the sound starts earlier.. at a lower pw.. not sure exactly but id say between 100-400us? It also has the same behavior as above.

The sound is NOT coming from the streamers.

My output has the longest arcs right before the flanging sound starts. The output still increases as I turn up the pw, but mainly thicker streamers, not length.

Does anyone have a similar experience as this? It doesn't seem to be an issue, but it could be. Idk.. I would just love to understand why its doing it.

Not sure if this will help, but here are the specs:

6 x 28 secondary 27awg 1550turns ish
6 x 28 Toroid
95khz ish res freq
3/8" Flat Copper Primary tapped around 6.5 turns
6s/13p 325nf 12kv MMC (78 CDE .15uf @ 2kv)
(2) CM400-12 Full Bridge
(2) 4700uf parallel = 9400uf @ 450v bus caps
208v In - 290vdc bus
UD 2.7C w/ OCD @ 1000amps
EVR Interrupter 1.0

Thank you for taking the time to read this. Hope all is well!

Kyle