AVR-Chat

Russell Shaw wrote:

> Kathy Quinlan wrote:
> 
>>Hi all,
>>
>>I need to find Bmax for a core set I plan to use, I am using a ETD34 with 3C90 
>>ferites, but I can not find the Bmax :(
>>
>>Anyone have any idea ??
>>
>>I have spent all night looking lol, (found lots of good data on other parts, 
>>but no this one)
> 
> 
> 0.33T.
> 

Thanks Mate,

I have a few more Q's:

When winding a Transformer, if I wind the turns to one end, and that is 
enough, is it wrong to bring the end of the wire back down the transformer 
parallel to the core center leg ? or should I wind half to the end, then wind 
the other half back to the beginning ?

The transformer whistles badly, it is no where near the switching Freq 
(~52Khz) is this due to the way I wound it ?

Where can I buy materials to gap the cores, it says no metallic, so I guess 
anything I can get in sizes of say 1,2,5,10,20 mils would be fine :)

At least it does start, and sort of works, the output is a bit low, but I used 
just 1n4007 diodes instead of shotkey for the rectifier and the ones in the 
circuits around the primary (they were specked at controlled avalanche ones 
(1n5062 IIRC) But I can not find any in stock and no where is really open till 
Tuesday lol.

TIA


-- 
Regards,

Kat.
---------------------------------------------------------------
  K.A.Q. Electronics     Website: www.kaqelectronics.dyndns.org
  IM: Yahoo: PinkyDwaggy MSN: katinka@kaqelectronics.dyndns.org
  For Everything Electronics 		   Phone: 0419 923 731
---------------------------------------------------------------


-- 
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.371 / Virus Database: 267.14.9/217 - Release Date: 30/12/2005