meets or exceeds 60% of the investment I will have to incur,
I will order from the OEM and take my chances on selling the
rest. I will keep you posted as to the status of this offer.
Anode + Cathode =
I would like to point out an error on the picture of an
LED. The schematic symbol polarity is reversed. The device
should be: cathode + and anode -. If the device is hooked up
as pictured, it will destruct. You might want to print a
correction in the magazine.
Thanks for having a look at the article. The LED drawings
on page 24 of the October 2016 issue appear to be correct.
Have a look at "LED" on Google Images. An LED must be
biased in the forward direction in order to emit light. Thus, +
to the anode and - to the cathode. This terminology of
cathode and anode is from the days of vacuum tubes: In a
vacuum tube, electrons flow from cathode to anode, so the
current direction (defined as the flow of positive charges) is
from anode to cathode.
That said, if you were to connect a low impedance
voltage source — say a battery — of sufficient voltage to the
LED in the polarity pictured, the LED would indeed destruct
after a brief flash. So, a current-limiting resistor is needed,
which is the purpose of R3, R4, and R16 in the circuit.
I did notice one small glitch: the upper-right paragraph on
page 26 refers to Figure 7; the reference should be to Figure
Electronics: The study of the electrical properties of and
the use of electronic devices.
Electronic devices include resistors, capacitors, inductors,
diodes, transistors, integrated circuits, antennas, waveguides,
electronic tubes, batteries, etc.
Electronics includes laying out circuit boards — signal
crosstalk, current limit for a given width of trace, impedance
matching, skew of parallel signals, etc.
A person experienced in electronics will know how to
assemble a circuit and how to solder the connections.
Programming DSPs, FPGAs, CPLDs, SoCs,
microcontrollers, computers, etc., is just that — programming.
Programmers do not need to know which end of a soldering
iron to grab. (There has been talk over the years that BSEE
graduates don’t know that either.)
I like the mix of articles and the mix within articles in
Nuts & Volts Magazine. This includes programming articles
about microcontrollers that react to and affect real world
devices. I would not change anything — not the articles nor
If you were to change the magazine’s name to Keyboards
and Microcontrollers, please consider that this new name
would make the magazine sound like a purely programming
magazine and you would probably not get any new readers
that are interested in electronics.
We need Nuts & Volts I know of no other magazine
that fills the bill for me. I like to read the mid-level articles in
N&V and the ideas I get from N&V. I like to find out about
the new devices used in your articles and mentioned in your
New Products department such as the DS1820 temperature
sensor, the S.USV Pi, and the EXasPiB.
- Took the Cleveland Institute of Electronics first phone
- Got my first phone FCC license 48 years ago. (Yup. I’m
almost older than dirt.)
- Was trained in television electronics — receivers and
broadcast equipment — in the Army (MOS 26T).
- Graduated from the Univ of MN with a BA in Industrial
- Worked as a technician and logic designer.
- Most of my employment has been as a computer
programmer — IBM mainframe and PC, have programmed in
more than 25 languages.
- Taught myself PIC16F, PIC18F, and PIC10F
- Have programmed and designed the electronics for
several microcontroller projects using the PIC18F4685,
PIC18F2455, PIC16F767, and PIC10F200.
- Since retirement, I volunteer as the studio engineer for
a 50 KW AM station.
PIC programming is so fun because there are no
problems from an RTOS or other operating system — there IS
NO operating system. I’m programming right down at the
Keep up the good work at N&V and please don’t change
Thanks for the comments, definitions, and a glimpse of
your impressive background. I don't think we have plans of
changing the name any time soon.
Continued from page 7
64 January 2017
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