Power supply requirements
The design requires plus and minus 15V supplies. The power supply should be adequately
regulated. The current consumption with no output signal is about +/-35mA. Power is routed
onto the PCB by a four way 0.156” MTA156 type connector or the special five way
Synthesizers.com MTA100 header.
Power connections – MOTM and Oakley
The PSU power socket is 0.156” Molex/MTA 4-way header. Friction lock types are
recommended. This system is compatible with MOTM systems.
Power
Pin number
+15V
1
Module ground (0V) 2
Socket ground
3
-15V
4
Pin 1 on the I/O header has been provided to allow the ground tags of the jack sockets to be
connected to the powers supply ground without using the module’s 0V supply. Earth loops
cannot occur through patch leads this way, although screening is maintained.
It's worth filling the empty holes of the PWR pads with solder.
Power connections – Synthesizers.com
The PWR power socket is to be fitted if you are using the module with a Synthesizers.com
system. In this case you should not fit the PSU header. The PWR header is a six way 0.1”
MTA, but with the pin that is in location 2 removed. In this way location 3 is actually pin 2 on
my schematic, location 4 is actually pin 3 and so on.
Power
Location number
Schematic Pin number
+15V
1
1
Missing Pin
2
+5V (Not used)
3
2
Module ground (0V) 4
3
-15V
5
4
Socket Ground *
6
5
If fitting the PWR header and using it with a standard MU power distribution system, you will
also need to connect together the middle two pads of the PSU header on the main board. This
link connects the socket and panel ground with the module ground. Simply solder a solid wire
hoop made from a resistor lead clipping, or bit of solid core wire, to join to the two middle
pads of PSU.
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