psu that can supply 200ma with two tap 250vdc and 136

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pre65
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#16

Post by pre65 »

skal1 wrote:sorry can not post circuit not my property, this is the reason i want to design my own psu.

, ok found the 5687 data so how do i work out the current draw of 1 5687 at 250vdc.


skal1
Go to the bottom of this data sheet ! Gives date for anode voltage of 250V, but bear in mind anode voltage is voltage on anode minus voltage on cathode ! Gets complicated eh ?

http://www.nj7p.org/Tube4.php?tube=5687

I am not the one to try and teach you how to read load lines. :wink:

Why can't you just copy the circuit you have ?
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Mike H
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#17

Post by Mike H »

The steady-state curent of a valve depends how it's DC biased, a load line graph can put you in the ballpark for that.

Then it's a case of Ohms law to find the supply dropper resistor needed for that current.

It can get quite involved unfortunately

 
 
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colin.hepburn
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#18

Post by colin.hepburn »

This link may help you along some basics on how to work with load lines
http://diyparadise.com/web/index.php?op ... &Itemid=27
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