View page with graphics
Feedback - February, 2004 QST
Several readers commented on the Doctor's
solution ["The Doctor is IN," Dec 2003, p 52] to feed a 3.2 W
speaker from an 8 W
source with a 250 or 500 W transformer. A better way to do this is to use a
multi-tapped line to voice coil transformer as an autotransformer. Connect the
8 W
secondary tap and the common across the audio output line and the 3.2 W
tap and the common to the speaker. Let the primary "float" unconnected. A 70 V
PA line to voice coil transformer works (RadioShack 32-1031).
The J. E.
Richards Middle School ["ARRL in Action," Jan 2004, p 12] is actually located
in Lawrenceville, Georgia, a suburb of Atlanta.
Page last modified: 01:01 PM, 05 Jan 2004 ET
Page author: qst@arrl.org
Copyright © 2004, American Radio Relay League, Inc. All Rights Reserved.