[net.micro.16k] power supply tolerances

mo@seismo.UUCP (Mike O'Dell) (03/19/84)

Power supply tolerances of plus or minus .1 volts are actually fairly common.
On an 11/70 I once ran, the +5 supplies had to be within .05 volts or
the machine simply didn't run, and this applies to ALL the +5 supplies,
of which there were at least 10 pots to be tweeked.  So, while that
requirements seems stringent, modern supplies can maintain the tolerance
fairly easily, and the requirement itself isn't that uncommon.

	-Mike O'Dell

beaucham@uiucuxc.UUCP (03/21/84)

#R:seismo:-71600:uiucuxc:25800003:000:287
uiucuxc!beaucham    Mar 20 09:29:00 1984

Thanks for your comment. Apparently the problem with the National chips
is that the "center voltage" varies from chip to chip, necessitating the
selection of a "matched set".  If all chips had the same center voltage,
the problem would be much less.
  
         Jim Beauchamp, uiucuxc