EVERYTHING FOR ELECTRONICS
Gerard Fonte’s interesting article
describing how to generate analog signals from digital has a couple of errors.
The standard R-2R ladder shown in
Figure 3 would (by definition) require
one set of resistors of one value and
a second set of exactly twice that
value. R1,R2,R3,R4 should be twice
R5,R6,R7,R8 or 2K in this example.
Under the description of Pulse to
Frequency Conversion (page 82, Jul ‘07
issue) the example given has a math error.
A 5V digital signal that is logic for 10% of
the time would have an average voltage of
500 mV (5V * 10/100), not 1V as stated.
on both counts. The reason for the mistakes
is simple: I just screwed up. Hopefully these
errors weren't too confusing. — Gerard Fonte
CALLING ALL CLOCK
In the serial port article in Jun ‘07,
G. Y. Xu seems to forget about the four
clock cycles it takes for the call to DLY49
µS. So, the call to DLY49 takes 54 µS.
When I submitted my “Probing Cores”
article, the ICL8038 — an old, obscure but
quite popular part originally made by
Intersil — was still available from Jameco.
Since then, the manufacturer has stopped
making it and Jameco is out of stock.
After a Google search, I’ve found that
the Harris (was Intersil) ICL8038 is available from futurlec.com. JDR Microde-vices jdr.com claim to have it, as well.
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Thank you for your interest and
comments on the article. You are correct
Chuck Hellebuyck Marvin Mallon
Jeff Eckert Ray Marston
Peter Best Michael Simpson
Russ Kincaid Gerard Fonte
Rick Davis Mike Bessant
Louis Frenzel Isidor Buchmann
David Geer Dan Casale
Dan Gravatt Dick Aidt
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