■ FIGURE 4
The RadioShack receiver is inexpensive but you might want to use a
Ramsey kit (www.ramseyelectron
ics.com) for a better looking integration. The 20 watt class D audio amp
from Ramsey should be plenty of
Mailbag continued ...
In the July ‘07 issue, you
stated that the program was
written in PICBASIC. Whose
version of PICBASIC are you
referring to? Is the program available for download?
— Gunther Hartung
Response: PICBASIC and
PICBASIC PRO compilers are
available from microEngineering
Labs, Inc. ( www.melabs.com).
You will also want Microcode
Studio or the Microcode Studio
Plus integrated development
power; you will have 120 watts total
with all six working. I built a class D amp
once; the intermodulation distortion
was horrible, but I guess the ear is not
very discerning because I have never
heard anyone complain about it.
environment, also available
from microEngineering Labs.
Microcode Studio is free but only
I believe there are several
errors on pages 30 and 32 of the
July issue. Figure 7 shows D1 as
1N4149 and the text calls it
1N4148. Figure 11 shows D2 and
D3 in the wrong direction; I
believe it requires a positive voltage to initiate the threshold. If so,
the diodes should be reversed. If
QI’d like to build a 12V
battery saver. I have a 12V
cooler in my SUV but if I
use it too long, my battery
not, would you explain the triggering operation? I took another
look at Figure 11; the IC1A is a 555
and IC1B is part of a 556. They
are labeled correctly but the pin
numbers are incorrect for a 556.
I need to say that I receive
several electronic magazines and
of them all, I really enjoy Nuts &
Volts the most. Every issue has
something that interests me.
Thank you for being associated
with such a great magazine.
— Al Izatt
Response: You are right. I
intended 1N4148 in Figure 7, but