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Subject: Re: High Voltage Input into 78xx
Date: Sat, 02 Nov 2002 10:41:15 GMT
NNTP-Posting-Date: Sat, 02 Nov 2002 11:41:15 CET
Organization: Telia Internet
It sounds like you have a full wave rectifier...why not use a half with a large
cap? okay you can only get 28% out in DC current..
If you have a full wave rectifier with a choke stabilize the current to a large
cap you will have 0,9 of the Vac instead of 1,4.... still a lot of drop....but
the current out will raise from 62% to 94% of Iac.
so a halv wave rectifier and a choke in serie before cap and 7805 can be the
Shaun Davy wrote:
> Just wondering if anyone could point me in the direction of how i could go
> about running a +5V regulator off a 35V DC input (24VAC) and draw around the
> 250mA mark and if possable for future projects upto .5A or 1A.
> Should i just use a normal 7805 and strap a big heatsink to it to dissapate
> all that heat or is there a better more efficient way?
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