On Sat, 23 Feb 2008 12:00:42 -0800 (PST), rick darwicki wrote:
>Anyone know a cure or if I can use a regular adaptor with a
>transformer/diode/cap without killing the modem?
As long as the electronics wants 5VDC to run, it doesn't much matter
whether that 5V comes from the el cheapo noise generator or a much
better one. You could, for example, simply use a 6V filament
transformer, rectifier, and cap filter to trickle-charge a 6V
battery and let the battery power any units that wants to see 5V.
Check the voltage at the battery, and if it's much more than 6V,
simply add one or two diodes in series that are rated for at least
2X the load current of the electronics -- an "ON" silicon diode will
drop about 0.7 volts.
Most little electronic boxes run on 12 volts, so you can run them
from a similar setup around a 12 battery, or from the 12-14V power
supplies that run ham gear.
BTW -- these float charger -- battery rigs make nice cheap UPS
backup for this stuff too.
73,
Jim K9YC
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