[sdiy] Power supply Xfmrs

[Don Tillman]

   Date: Mon, 27 Aug 2001 16:08:31 +1000
   From: Paul Perry <pfperry at melbpc.org.au>

   At 10:46 PM 26/08/01 -0700, Tavys Ashcroft  wrote:
   >I just happened upon a large number (like 8 or so) power supply 
   >transformers.  They're nice Stancor ones with 120V primary and 28V 
   >center tapped secondaries. 

   You will have no trouble running 15v regs with these.
   Because, 14v AC rectifies to a peak of over 19v.
   So there is plenty of room for the regs.

What is the tolerance of the transformer's secondary voltage?
What if the ac line voltage is running low?
What about diode drop?
What about capacitor droop?

  -- Don

-- 
Don Tillman
Palo Alto, California, USA
don at till.com
http://www.till.com