Re: Generator exhaust routing


"Matthew Beasley" <nobody@xxxxxxxx> wrote in message
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"Neon John" <no@xxxxxxxxx> wrote in message
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AC voltage is "around 12". If memory serves, the input is a full wave
bridge
followed by a 7805 voltage regulator so the input voltage doesn't matter
much. The 9
volt battery fed the regulator through a diode. Current draw is probably
under
100ma, though I don't recall the number. It would have to be at that
level or below
for the 9 volt battery to have any life at all.

I know that they changed the circuit a little in subsequent production
because the
one that I have here at the cabin doesn't yowl if the 9 volt battery
isn't present.
It does yowl if the battery is low, however. Still, the basic power
circuit should
be the same.

I just purchased a Kidde from Homedepot for $60. It is a combination
flammable gas and CO alarm with a CO PPM digital readout. It does beep
when the battery isn't present. But it seems to work fine only on 9V in -
other than the battery will die fast I'm sure. I have some LM1084
regulators laying around so I'm going to make a 9V regulator and just feed
9V into the battery clips. The draw is 62mA idle and 90mA in alarm.

Dang, it gets even better than that.

When on battery power for longer than 5 minutes, it powers down the
flammable gas sensor and cycles it back on every 8 minutes. After 8 minutes
the flammable sensor works for 2 minutes and the cycle repeats. The CO
sensor remains on continually. By blanking the display and powering off the
flammable gas sensor the draw drops to 4mA. So that's an average draw of
only 15mA. I'm going to use the wall wart to power it continually when 120V
is available.

Sure beats the power draw of ANY "RV" detector I have found.


.

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