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Maximums
Absolute Maximum DC input voltage ±30
Maximum operational DC input voltage +30
Maximum DC threshold voltage @ +27.5
Minimum Functioning Voltage @+3.9V (with low audio volume)
Sound Level
Note that the sound level from Volt Tattler is dependent on the source supply. This means that low
voltage annunciations will generally be lower volume than high voltage annunciations. The output
signals, however, will have proper logic levels (3v, 0v) from 30V down to about 3.9 volts.
Volt Tattler 2 Cannot/Should not
This is a discussion of some of the things that Volt Tattler 2 cannot or should not do. There are many
others yet to be found.
A Volt Tattler 2 should not be used to detect highly transient (i.e. brief) voltage excursions. It may
detect them but not every time. Volt Tattler 2 only measures the D.C. voltage around 20 times per
second. If the excursions happen in the between times they will be missed.
A Volt Tattler 2 cannot reliably measure highly noisy D.C. voltages. If your D.C. voltage is quite noisy
then you have a problem with the voltage source that should be remedied.
A Volt Tattler 2 is not made for extremely hot or cold environments. The microcontroller is rated -40C
to +85C. But the rest of the components may not like that. I am sure it would be possible to design
something for temperature extremes. But I am not sure of the components that are supplied.
The Volt Tattler 2 has no particular robustness with regards to humidity, wet or corrosive environments.
It is a simple PC board with a speaker that needs to breathe air.
The Volt Tattler 2 cannot compensate for bad or questionable power system design. As mentioned up
front it is intended for use as an enhancement of a properly designed system.
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