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Internal Mains Transformer
The following advice is only for those who know how to wire mains rated equipment safely. If
you do not know how to do this then make no attempt to do so. I do not endorse this method
of powering any Oakley equipment. It is up to you to use your PCB wisely. I take absolutely
no responsibility for your actions with this board. I will offer no further advice than what you
see here in italics:
Transformer rating: Secondaries: 18-0-18 @ 250mA or 18-0, 18-0 @ approx 15VA total
Connect common, or centre tap, to AC1 and/or AC0. Others to AC2 and AC3.
Line fuse: T250mA
Any metal case must be earthed directly from the mains inlet socket with a thick piece of wire
and suitable bonding point on the case.
0V on the board should also be tied to earth using a piece of wire connecting the earth
bonding point and the 'CASE' solder pad on the board. R126 should be a wire link and not a
resistor.
Powering the Filtrex with the MOTM header
The Filtrex may also be powered from the MOTM or Oakley power busses. The power socket
is 0.156" Molex/MTA 4-way header is marked as MOTM on the PCB. Friction lock types are
recommended. The pin out is as follows:
Pin one is depicted by the diagonal on the legending. If you are using the MOTM system to
power your Filtrex, be sure not to fit the following components which make up the Filtrex's
own +/-15V regulated supply:
U15, U11, D13, D14, D18, D19, D9, D24, C40, C47, C38, C50
You can also use the Filtrex to power other MOTM/Oakley modules using the MOTM
header. However, be sure not to exceed the power rating of the wallwart, transformer,
heatsinks and smoothing capacitors.
Power
+15V
Module GND
Module GND
15V
18
Pin number
1
2
3
4
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