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RE: [N8VEM-S100:1227] Z80/8086/8088: 7805 vs. LM323K

Yes all those boards really need the higher ampage/better cooling T0-3's.
Ignore the 7805 on the schematics.
7.5V works fine for all my boards, but go to 8V if you like, just burns off
a little more heat.  With 74LSxx's you are way below the max specs of the


John Monahan Ph.D
e-mail: mon...@vitasoft.org
Text:    mon...@txt.att.net

-----Original Message-----
From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On
Behalf Of Paul Birkel
Sent: Wednesday, December 26, 2012 11:27 AM
To: n8vem...@googlegroups.com
Subject: [N8VEM-S100:1227] Z80/8086/8088: 7805 vs. LM323K

I'm confused, as the S100 Z80 Master CPU parts-list specifies a 7805, yet
the silkscreen and images show a TO-3 case, and the general board
description indicates 3A.  These all seem to indicate that a LM323K is the
intended part.  Is that the case?  (I note that the LM323K has a min. Vin of
7.5v ... which seems a bit iffy to me but 8v *is* still higher :->).

Is the same also true for the 8086 and 8088 S100 boards -- use a LM323K?

Thanks for your insights and/or experience (for you builders out there).