Published Monthly By
T & L Publications, Inc.
430 Princeland Ct.
Corona, CA 92879-1300
(951) 371-8497
FAX (951) 371-3052
Webstore orders only 1-800-783-4624
www.nutsvolts.com
Subscriptions
Toll Free 1-877-525-2539
Outside US 1-818-487-4545
P.O. Box 15277
North Hollywood, CA 91615
FOUNDER
Jack Lemieux
PUBLISHER
Larry Lemieux
publisher@nutsvolts.com
ASSOCIATE PUBLISHER
Robin Lemieux
robin@nutsvolts.com
EDITOR
Bryan Bergeron
techedit-nutsvolts@yahoo.com
CONTRIBUTING EDITORS
Jeff Eckert Russ Kincaid
Joe Pardue Fred Eady
Jon McPhalen Paul Verhage
William Pippin Matt Bates
Ron Hoffman John Gavlik
Martin Hebel
ADVERTISING SALES EXECUTIVE
Richard Lockhart
richard@nutsvolts.com
CIRCULATION DEPARTMENT
subscribe@nutsvolts.com
SHOW COORDINATOR
Audrey Lemieux
MARKETING COORDINATOR
WEBSTORE
Brian Kirkpatrick
sales@nutsvolts.com
WEB CONTENT
Michael Kaudze
website@nutsvolts.com
ADMINISTRATIVE ASSISTANT
Debbie Stauffacher
PRODUCTION
Sean Lemieux
Copyright © 2013 by T & L Publications, Inc.
All Rights Reserved
All advertising is subject to publisher’s approval. We
are not responsible for mistakes, misprints, or
typographical errors. Nuts & Volts Magazine assumes
no responsibility for the availability or condition of
advertised items or for the honesty of the advertiser.
The publisher makes no claims for the legality of
any item advertised in Nuts & Volts. This is the sole
responsibility of the advertiser. Advertisers and their
agencies agree to indemnify and protect the publisher
from any and all claims, action, or expense arising from
advertising placed in Nuts & Volts. Please send all
editorial correspondence, UPS, overnight mail, and
artwork to: 430 Princeland Court, Corona, CA 92879.
Printed in the USA on SFI & FSC stock.
EVERYTHING FOR ELECTRONICS
November 2013 7
Transistor Twister
In his "Build a Headset Amplifier"
article, Ron Anderson explains that
experimenters can make several
errors in building solid-state circuits.
If an experimenter was to try and
make sense of the amplifier
schematic, they would immediately
get confused to see the schematic
symbols of NPN and PNP transistors
are indeed reversed.
I like to remember the transistor
symbols as: NPN — Never Points iN
and PNP — Points iN Permanently
Overall, I did find the design very
instructive, and a bit reminiscent of
the way we did things in the early
1970s. I always enjoy Nuts & Volts!
Robert Trescott
San Diego, CA
In the text of Ron's October
article, the transistors were marked
incorrectly. These are the proper
specs:
Correct:
Transistors Q1-5 2N5401 PNP
Transistors Q6-9 2N5551 NPN
Incorrect:
Transistors Q1-5 2N5551 NPN
Transistors Q6-9 2N5401 PNP
Shedding Light
On a Schematic
I enjoyed reading Gerry Shand’s
article in the June issue about the
"Electronic Photocell for Lighting
Control." I like his use of the math
coprocessor; I had not thought of
that before! In the schematic, I have
three questions I hope Gerry can
• Why did you choose the
relatively expensive switching voltage
regulator instead of a common linear
component?
• Why do you employ two
resistors in parallel to limit the current
through each of your LEDs?
• In case of a power outage,
what duration can you expect from
your super capacitor until your time
chip loses the current time?
Thank you!
Judy May W1ORO
Union, KY
Thank you for your questions,
Judy! Here are the answers:
1. I used a switching voltage
regulator in lieu of a standard
Continued on page 60
READER FEEDBACK