🚀 go-pugleaf

In article <1992Aug27.221155.19203@midway.uchicago.edu> gary@midway.uchicago.edu writes:
>
>Anyone got the scoop on power inverters?
>
The square wave types are generally inexpensive, simple, reliable, and
efficient.  The relatively fast rise time may cause buzz in some
sensitive audio circuitry.

The biggest problem that arises when a square wave feeds ordinary
linear power supplies is that with the significantly lower peak
voltage of the non-sine wave input, the equipment power supply
rectifier-capacitor combination will produce a much lower voltage.
Sometimes, a subsequent regulator may then not see a sufficient
input-output differential.

Generally, if equipment having a linear power supply will work down to
90 VAC sine wave input (test with variac), then it will do fine on a
square wave inverter.

At KUFX, I have three Tripplite SPS units which blast square waves into
the main air studio and engineering room equipment for up to one hour
twenty minutes if the power fails.  It works perfectly; we don't even
get any buzz on the microphones.  You know the time is up, however, 
(besides looking at the battery voltmeters I supplied) when an
increasingly loud hum/buzz appears on the air - linear regulators
giving up.   
-- 
KUFX |      w  ["]                            | WA6MBV     
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