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|28th September 2004, 05:15 AM||#42|
diyAudio Senior Member
Join Date: Aug 2002
Stop crying...Can't have that...
|19th November 2004, 06:28 PM||#43|
Join Date: Dec 2003
Location: New Zealand
Yeah! exams are finished !!
It was holding me for almost 3-4 months !!
And I finally got ONE better potted transformer (Paeco by HP I guess) and is much more powerful with proper primary windings (115+115= 230V).
But ther's no powerful-enough center-tapped sec. winding, but two powerful single windings.
So could you guys help me to design a hybrid rectification for this transformer?
I basically got 2 secondary windings found to be useful:
One is rated for 302V @ 0.2A, but the voltage seems to be too high for hybrid rectification to be used to obtain approx. 250VDC..
The other one is rated for 205V @ 0.25A (with a tap rated for 167V, but that's not a CT... let's ignore the odd tap and use the 205V one...) I'll use the 0V and 205V taps to use the winding as a single winding.
----- 205V @ 0.25A
Here are the things that I have, to be used for the PS:
*12pcs 100ohm 50W Aluminium Clad Dale resistors. I can connect many of these to increase the resistance.
*Many EZ80 rectifiers.
*A pair of MKP 60uF 370VAC motor-run caps.
I don't have any more space on my chassis to add another large component, like a choke or a cap....
Please remeber that this SINGLE transformer will supply BOTH channels. I'll build TWO PSU, ONE for EACH cahnnel.
I'm finding it very difficult to design one by myself, because the PSU designer program is not available for hybrid rectification, and both tube and SS diodes/rectifiers are used in this... (tube rect. has higher forward V drop than the SS diodes.... Then how do I combine the two to obtain the same, single voltage? ).
Please help, please, please please !!!
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