Recently I had the chance to get my hand on a Mark Levison 38 preamp board. Unfortunately I
only have the main board, not the case and not the display/potentiometer control. Since I
want to make this board a fully functional preamp I need to rebuild a display or just know
how to switch the source but since I was not able to get my hand on the schematics for this
preamp ( which seem's to be classed secret defense) I need to figure out how this beast
works...
The only clue I got is from some picture I found on the net is that the display and the
front panel control (including the standby switch) are connected via a flat wire to a 9 pin
(one set of 5 pin and a set of 4 pin below) interface on the main board but have absolutely
no idea how does this work???😕
The potentiometer seem to by easier to work with since it connect on a 4 pin connector on
the main board but I still dont have any clue how does it work (does it short 2 pin for the
volume up and 2 other for the volume down????)
That is why I need really BADLY SOME HELP!!! If someone know how does those preamp works
please contact me!!!
I attached a picture of the board if this can help...
Thanks.
only have the main board, not the case and not the display/potentiometer control. Since I
want to make this board a fully functional preamp I need to rebuild a display or just know
how to switch the source but since I was not able to get my hand on the schematics for this
preamp ( which seem's to be classed secret defense) I need to figure out how this beast
works...
The only clue I got is from some picture I found on the net is that the display and the
front panel control (including the standby switch) are connected via a flat wire to a 9 pin
(one set of 5 pin and a set of 4 pin below) interface on the main board but have absolutely
no idea how does this work???😕
The potentiometer seem to by easier to work with since it connect on a 4 pin connector on
the main board but I still dont have any clue how does it work (does it short 2 pin for the
volume up and 2 other for the volume down????)
That is why I need really BADLY SOME HELP!!! If someone know how does those preamp works
please contact me!!!
I attached a picture of the board if this can help...
Thanks.
Attachments
Its complicated
I see those levinson boards on ebay from time to time, they look pretty complete, but I think its not too easy to get them up and running.
The volume is probably and optical encoder controlled by pic on the board, not a resistor as you seem to be guessing. Those are kind of complicated but people smarter than me use them so it must be doable.
The input switching should be easier, but if controlled by a microprocessor you will have a tough time figuring it out.
I guess I am sad that I cannot help, but just wanted to warn you that it might be much more complicated than you think.
I see those levinson boards on ebay from time to time, they look pretty complete, but I think its not too easy to get them up and running.
The volume is probably and optical encoder controlled by pic on the board, not a resistor as you seem to be guessing. Those are kind of complicated but people smarter than me use them so it must be doable.
The input switching should be easier, but if controlled by a microprocessor you will have a tough time figuring it out.
I guess I am sad that I cannot help, but just wanted to warn you that it might be much more complicated than you think.
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