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AC
Voltage
Regulator
for
the
MEP-002A
and
MEP-003A
military
generators
Price: $199 each, 2
year warranty
Shipping
$8
flat rate for USPS Priority Mail within the
lower 48 US states
Out of the continental US, shipping is actual
cost Priority Mail
To order, send a email to  with your shipping
address and the email address you use for
PayPal. I'll send a PayPal invoice which
you can pay from your PayPal balance, or with a
credit card. You don't need a PayPal
account to pay the invoice with a credit card.
If you'd like to send a check, email me and I'll
send instructions.
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New Direct
Replacement for MEP-002A and
MEP-003A AC Regulators
This is a newly
manufactured AC voltage regulator for the MEP-002A and
MEP-003A
military generators. It is a direct replacement for
the original
72-5020 and 72-5338 regulators, which used jumpers to
configure them
for either 60 Hz or 400 Hz operation. This new board
is derived
from the 72-5338 board, and its components and terminals
are marked to
match the originals. This means it is a direct swap
to install,
and the references to terminal numbers and components in
the technical
manuals correctly refer to this board's parts.
Simplified Design
This regulator has been simplified by eliminating
the extra parts and
terminals needed for 400 Hz configuration. Even
though there are
only ten connection terminals instead of the 19 on the
original board,
they are numbered to match the equivalent terminals of the
ten on the
old board that actually had wires connected to them.
Component
designations, such as "R1" and "Q3" for example, match as
well, and
all the components are modern and currently available from
electronics
parts suppliers.
Much Better
Heat
Dissipation
The use of up to date components and a compact
circuit board layout allows
the regulator to be much smaller than the originals.
The boards
are assembled to an anodized aluminum plate, with
standoffs installed
that match the
mounting holes of the original regulator. The plate
also serves
as a heat sink for
the output transistor. This transistor is rated at 4
Amps
maximum, where the original was rated at 2 Amps maximum,
and by giving
it the large plate to dissipate heat, failure is very
unlikely.
In fact,
during testing and calibration with the apparatus shown in
the
military technical manual,
when the procedure warned not to run the test for more
than two minutes
at a time to avoid destruction of the output transistor,
it was run for
15 minutes straight, and the only result was a slightly
warm heat sink.
Affordable
But Still
Reliable
To keep this board affordable, it does not
use the very expensive
mil-spec tantalum electrolytic capacitors the originals
had, but it
does use aluminum electrolytics that are rated for
thousands of hours
at their
rated voltage, at 105°C or higher, and in this application
they don't
get near
their rated voltage or temperature.
Simple
Installation
Installation is straightforward,
and
detailed
instructions are included.
The
instructions
are
available
as
a
PDF
download
here: MEP-002A/003A
Regulator
Installation
2-Year
Warranty
We will repair or replace
this regulator, or refund the
purchase price, at our option, if it fails to perform
properly as a
result of defects in materials or workmanship, within
two years of the
date of purchase. Return the regulator to us
at
your expense, and we'll repair or replace it and ship it
to you at our
expense.
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Back side view, showing pressed-in
stainless
nuts that allow the circuit board
to be removed without removing the mounting plate from
the control
cabinet.
Regulator installed in MEP-003A control
cabinet
Regulator Being Calibrated According to
the
Technical Manual Procedure
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