"bitrex" <bitrex@de.lete.earthlink.net> wrote in message 
news:PL6dnU5fuMoL_xbJnZ2dnUU7-e2dnZ2d@earthlink.com...
>> http://seventransistorlabs.com/Images/Discrete_Tube_Supply.png
>>
>
> Nice use of the "Forrest Mims" oscillator topology!

Hmm, hadn't thought of that.  I pieced that together from scratch, but I 
suppose some of the feedback bits are reminiscient.  It's not really a 
multivibrator though, more like a monostable with a variably leaky 
re-trigger.

Predecessors used feedback from the output transistor (gate or drain), but 
as this varies with supply and load voltage, I try to avoid doing that. 
Still, comparable performance and behavior (current mode control, no 
feedback winding required) from four transistors wasn't too bad either.

Tim

-- 
Seven Transistor Labs
Electrical Engineering Consultation
Website: http://seventransistorlabs.com 

"Tim Williams" <tiwill@seventransistorlabs.com> Wrote in message:
> http://www.hammondmfg.com/pdf/EDB262A12.pdf
> 
> Try Edcor too.
> 
> Or if you had an automotive application in mind,
> 
> http://seventransistorlabs.com/Images/Discrete_Tube_Supply.png
> 
> Tim
> 

Nice use of the "Forrest Mims" oscillator topology!

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http://www.hammondmfg.com/pdf/EDB262A12.pdf

Try Edcor too.

Or if you had an automotive application in mind,

http://seventransistorlabs.com/Images/Discrete_Tube_Supply.png

Tim

-- 
Seven Transistor Labs
Electrical Engineering Consultation
Website: http://seventransistorlabs.com

"bitrex" <bitrex@de.lete.earthlink.net> wrote in message 
news:VKOdnRyLY98mqhfJnZ2dnUU7-d2dnZ2d@earthlink.com...
>
> Several years ago I remember buying an Allied Electric branded
> power transformer similar to this one:
>
> http://www.alliedelec.com/search/productdetail.aspx?SKU=70009000#t
> ab=overview
>
> But if I recall correctly the unit I bought was somewhat smaller;
> the primary had no center tap and the filament winding was rated
> for just 300 mA.  It doesn't seem to be on their site anymore.
> Does anyone make a similar product?
>
> At these power levels I'm wondering if it might be easier and
> cheaper to just use a switcher for B+.
>
> -- 
>
>
> ----Android NewsGroup Reader----
> http://usenet.sinaapp.com/ 

Several years ago I remember buying an Allied Electric branded
 power transformer similar to this one:

http://www.alliedelec.com/search/productdetail.aspx?SKU=70009000#t
ab=overview

But if I recall correctly the unit I bought was somewhat smaller;
 the primary had no center tap and the filament winding was rated
 for just 300 mA.  It doesn't seem to be on their site anymore. 
 Does anyone make a similar product?

At these power levels I'm wondering if it might be easier and
 cheaper to just use a switcher for B+.

-- 


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