This is only a preview of the February 1996 issue of Silicon Chip. You can view 26 of the 96 pages in the full issue, including the advertisments. For full access, purchase the issue for $10.00 or subscribe for access to the latest issues. Items relevant to "Woofer Stopper Mk 2 - Now It's Even Better!":
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turns of light gauge enamelled copper
wire for each winding.
As far as battery testing is concerned, the ideal load for a particular
battery really depends on your application. A battery intended for use in a
torch will have a far greater operating
load (and high current demand) than
one intended for use in a remote control handpiece. In practice, a useful
load for typical single cells and 9V
batteries is one which draws about
a watt or so.
Hence, for a single AA cell, you
would need a resistor of about 2.22.7Ω, with perhaps lower values for
C and D size cells. In fact, a good D
cell should comfortably deliver 1A or
more for a short period.
Under the above load condition, a
1.5V cell should deliver at least 1.2V;
the more, the better.
For a 9V transistor battery, the load
should draw about 100mA and this
means a resistor of around 82Ω. Under
these conditions, we would expect a
good battery to deliver at least 7.5V;
again, the more, the better.
By the way, these load tests should
only be applied for a few seconds or
so; anything more will needlessly
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discharge the battery.
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Prologic Surround Sound Decoder
Mk.2; November & December 1995:
The +5V and GND connections for
the microprocessor board (01409954)
are shown transposed on the overlay
diagram on page 72 of the December
issue. The wiring diagram on page 74
of the same issue needs to be altered
so that wire “26” goes to the left pin
while the wire from the power supply board goes to the right pin. Wires
shown connecting to switch S4 are
correct. Also, the reference to IC4 in
the 7th line, third column on page 78
should be to IC6.
Subwoofer Controller, December
1995: the circuit diagram on page 40
should show R34 directly connected
to +12V to agree with the PC board
overlay diagram on page 41; R34 does
not connect to R7, C5 and pin 8 of
IC2a as shown on the circuit. While
the board will work, it ideally should
be altered to agree with the circuit. D1
& D2 on the same board diagram are
shown transposed although this has
no effect on circuit operation.
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