Re: LF: W1VD amp help - more waveforms

[N1BUG <paul@n1bug.com>]

Hi Chris,

Actually that's a bit of trickery on my part. :-) I wanted all the
coils to "look" about the same. All the Delrin end plates are 1/4"
thick. On the center one I wrapped the core with glass cloth tape,
wound I think 54 turns, wrapped part of that winding with glass
cloth tape, wound the remaining turns for a total of 73. Then I
milled down the 1/4" thick Delrin plates to 1/8" in the area that
would be on the double layer part of the winding. So the plates
slide on exactly as far and leave exactly as much bolt exposed as
the plates on the single layer end coils. A bit hard to put into
words but I think you get the idea. I promise you they are 52, 73,
and 52 turns.

Paul



On 04/12/2018 02:19 PM, Chris Wilson wrote:
> 
> 
> 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