Power Connections
The ASV main PCB has four power headers, two MOTM/Oakley and two MU. Whether you
choose MOTM/Oakley or MU, both headers of the same type must be connected back to your
power supply or power supply distribution system. That is, both MOTM/Oakley or both MU. It is
best not to mix types, so using one MOTM/Oakley and one MU is not recommended.
Failure to connect one or the other connector will not result in damage to the ASV or your power
supply. However, the ASV will not work correctly. The lower headers, PWR2 and PSU2, power the
LFO and VCO2. The upper headers, PWR1 and PSU1, power the rest of the ASV. Sharing the
power over two leads reduces the chances of unwanted interaction between the two VCOs and helps
provide a good solid 0V connection.
Current consumption with both connectors attached is approxi/-180mA at +/-15V. +/-12V
operation is not possible.
MOTM and Oakley
The PSU1 and PSU2 power sockets are 0.156” Molex/MTA 4-way headers. Friction lock types are
recommended. This system is compatible with MOTM systems.
PSU1
Pin number
+15V
1
Module ground (0V)
2
Module ground (0V)
3
-15V
4
PSU2
Pin number
+15V
1
Module ground 2 (0V)
2
Socket ground
3
-15V
4
Pin 3 of the PSU2 header is connected via the main board's internal tracking and interconnects to
the 1/4” sockets' ground lugs on the socket board. Thus the ground tags of all the jack sockets are
connected to the power supply ground without using the module’s 0V supply. Earth loops cannot
occur through patch leads this way, although screening is maintained.
MU and Synthesizers.com
The PWR1 and PWR2 power headers are to be fitted if you are using the module with an MU or
Synthesizers.com system. In this case you should not fit the PSU1 and PSU2 headers. The PWR1
and PWR2 header is a six way 0.1” MTA, but the pin in location 2 is removed. In this way location
3 is actually pin 2 on my schematic, location 4 is actually pin 5 and so on.
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