SM expose'

[turbo]

marco,

i think your "irregular pattern" comes from the whole thing riding on a much lower frequency.

Thinking isn't going to bring you any further.
You need to make sure and this you cannot achieve by thinking.

Marco.

[HEYDUDE]

Good guess poynt

Rather than bias up the core externally, I used a self bias technique with the diode. The company I helped to start in 1965 were building magnetic amplifiers that used that technique for AC phase control. Saturable core reactors. I still have a few beasts in the basement. Then we went to thyristors, then triacs. Photo of a beast anyone?

[poynt99]

marco, if you were using only 50 or 60 Hz, then either:

a) you've got 120Hz riding on 60 Hz, or
b) you're mixing two out of phase 60 Hz signals to get a LF beat, and it is this beat frequency that's giving your irregular pattern.

i'd say you're getting b), but since you're keeping it a secret, only you really know. we can't read your mind.

[ramset]

HEY DUDE   Marco said his input was 500vdc his kicks were 2500 vdc   GK rang the bell and had an echoe in the same scope shot that seemed to be an anomoly ? Chet

[HEYDUDE]

Chet
These things are easily explained. I can change the scope horizontal timebase display to show two bells.
I was experimenting with duplicating a waveform, not the particular amplitude of a waveform. High voltage is easy, been around it on a large scale all my life.

In a week or so I'll be doing some consulting at my friends capacitor factory. Hope to post some pictures of HV stuff that'll blow your socks off, large rotary spark gaps. 500KV, 2 story transformers for dielectric testing. I design some of his test sets.
He's gonna give me a truckload of large caps that have been rejected for minor cosmetic defects, but are electrically OK.