[Milsurplus] instrument inverter

[Dave Maples]

Ray: I built a 400 Hz oscillator out of a 555 timer a long time ago,
followed it with a 3-stage RC lowpass filter to round off the square edges,
and used that to drive a paging amplifier.  Worked like a champ.  For what
you are looking for, a 6V filament transformer connected to the 4-ohm output
of such an amp would probably get you awfully close.

Dave WB4FUR



-----Original Message-----
From: milsurplus-bounces at mailman.qth.net
[mailto:milsurplus-bounces at mailman.qth.net]On Behalf Of Ray Fantini
Sent: Thursday, January 25, 2007 4:50 PM
To: milsurplus at mailman.qth.net
Subject: [Milsurplus] instrument inverter


Q: My 618S1 requires 115 volts at 400 cycles, not a lot of current just
running couple servo motors, the fans been replaced with DC model. Am
planing on using small motor generator ( instrument inverter ) to supply
this. The motor part requires 28 volts at ten amps and was wondering how
important input DC voltage regulation is? know that output frequency is
a function of speed ( RPM ) but have no idea what regulates the output
of a instrument inverter? is it controlled by load or a function of
input voltage?
Ray Fantini KA3EKH
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