Guru
Joined: 13/10/2014
Location: AustraliaPosts: 1860
| Posted: 04:46am 27 May 2023 |
Wound two chokes, each a 7 stack comprising 5 x black and 2 x blue toriod rings each, it's what I had, there is not a lot of difference between the T-rings.
Still same 4 turns each, that's all that will fit, 6 cores got me 23uH instead of 16uH for 4 cores:
Inductance is 23uH each, both measured identical of course.
The saturation of one could be enough, but the two combined are passable I guess.
BOTH images are for only ONE choke.
The HF noise reduction with wiseguys design was the first thing I noticed when I swapped the inverter boards over from the China board, it was virtually silent across the band. Nothing else was changed when the boards were swapped.
Running with only one choke bought it back to a similar noise level as the China board. After splitting the 37uH choke into two x 23 uH chokes, it was almost silent again, just needed two RF toriods rings over the AC feeds from the transformer to remove one or two slight birdies on the band.
Started every load and now have some DSO captures to go over.
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Edited 2023-05-27 14:52 by KeepIS