|26th January 2006, 03:21 PM||#11|
Join Date: Feb 2005
Location: NEW DELHI
i m posting the image for correctly using the diodes across the regulator ics
the diodes provide protection(they must not be reverse biased).
d1 and d2 ensure that the transients on the regulator o/ps do not drive the o/ps to a potential above their i/ps and cause damage to the regulators.
regulators may not turn on simultaneously,if such a condition occurs the o/p of the slower one may be driven to the potential of the faster one ,so d3 and d4 prevent this condition.
IN4007 or alike are sufficient.
Never Underestimate The Bandwidth of A Station Wagon Full Of Magnetic Tapes Hurtling Down The Highway...................Andrew S Tanenbaum
|26th January 2006, 03:32 PM||#12|
Join Date: May 2002
Location: The great city of Turnhout, BE
Blog Entries: 8
No. With the neg reg, if the cap discharges, the reg input is pos with respect to its output, and the diode shunts the cap discharge current away, as shown in the previous post.
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