Paul, Chris, Jay et al

Probably rubbish but I think its an angle we have not considered yet. :-))

Alan
G3NYK

To: "N1BUG" <[email protected]>
Sent: Thursday, April 12, 2018 7:19 PM
Subject: Re: LF: W1VD amp help - more waveforms

Hello Paul,

I  am looking at your photo of the LPF. The specs say L1 and L3 should
have  52  turns,  and  L2, the centre one, should have 73 turns. i was
unable to get 73 turns on the toroid without winding on top of a lower
layer,  and  insulated  with  Kaptan tape. This made the overall depth
quite  a  bit  deeper  than  L1 and L3. In the photo it looks like the
centre  toroid  overall is no deeper than the end ones, and the amount
of bolt thread protruding *LOOKS* the same as the end ones. Your build
is so painstakingly neat though, it may be that you have aesthetically
made all the toroids look identical.

http://www.chriswilson.tv/paul-lpf.jpg

Thursday, April 12, 2018, 5:42:13 PM, you wrote:

Jay,

When the package arrives I will swap out the caps and the IR2110. If
that doesn't do it I will order a new 74F74 and swap out the
resistors. If all of that fails I don't see anything else I can do.
Realistically at my level of expertise if it doesn't work at that
point I will have reached the end of the road. :-(

The caps I have are KEMET part # R82EC1100Z350J

Here is a link to the datasheet:

https://www.mouser.com/datasheet/2/212/KEM_F3101_R82-1103738.pdf

Paul

--
Best regards,
Chris                            mailto:[email protected]