[ARC5] AM linear amplification

[Kenneth G. Gordon]

On 20 Dec 2016 at 18:25, AKLDGUY . wrote:
 
> > Got any microwave ovens around your neck of the woods?
> 
> Yes, you can spot them out on the kerb every year during the annual inorganic collection. Or you 
> can get them from Salvation Army or other charity shops for a song. I knew they had HV 
> transformers, but thought they didn't deliver much current?

They deliver well over 1KW of power. Their main trouble is that one side of the secondary is 
connected directly to the core. There are several articles on the web describing ways to 
safely use them in a homemade amplifier, though.

In addition, there is usually a magnetic shunt installed in the core, and this must be 
removed, but it is a quite simple process. One drives it out with a screwdriver or a punch 
and a hammer.

Microwave ovens also include an excellent HV rectifier, but usually only 1/2 wave, so you 
have to use two of them.

> > My preference is push-pull Class B. For a single-band, that isn't all that difficult to
> > implement...and it has other advantages...
> >
> > Besides, it is symetrically pleasing...at least to me... :-)
> 
> Yes, PP appeals to me too. I was thinking of a dual bander 80/40, but the BC-230 might spend 
> most of its time on the 40m AM net. Pulling out and changing that coil unit is a pain.

Yes. I agree. That is why I mentioned "single band". :-)

Ken W7EKB

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