Vintage Synth Repair

re 3 pins, the mutron biphase connects two different types of pedals.  One set is simply two on off buttons and aground (3 wires)


But if it has the opto continously variable pedal controller the ldr is a resistance loop for cv and that's what the other two wires are about.


So it is no accident they use five pin connectors.  If you go three pin you cannot use a pedal to control depth or lfo rates.





Lorne in Canada





From: vintagesynthrepair@yahoogroups.com [mailto:vintagesynthrepair@yahoogroups.com]
Sent: October-18-14 3:23 PM
To: vintagesynthrepair@yahoogroups.com
Subject: Re: [vintagesynthrepair] mutron biphase din jack wiring








From: "lighterthanairflight@... [vintagesynthrepair] <mailto:lighterthanairflight@gmail.com%20[vintagesynthrepair]> " <vintagesynthrepair@yahoogroups.com>
To: vintagesynthrepair@yahoogroups.com
Sent: Friday, October 17, 2014 12:56:01 PM
Subject: [vintagesynthrepair] mutron biphase din jack wiring



hello,  I just bought a replacement din jack to replace the one removed from a mutron biphase.   But because the wiring was disconnected..  I do not know the pinout of the din jack.   the schematic shows 3 of the 5 connections to the pedal,  but the others are not labeled.





anyone have the pinout or have a picture of the din jack from the back?





I have searched the internet with no luck,  any help would be much appreciated.


----------------------------------------------------------------------


Here's what I came up with:





J6 pin 1 - NC


J6 pin 2 - pedal in


J6 pin 3 - pedal switch A


J6 pin 4 - pedal switch B


J6 pin 5 - NC





The outside metal case of the cable connector gives the ground connection, so 3 pins are all they need. They probably already had a bunch of 5-pin connectors, and purchasing additional 3-pin connectors just for this would not have been a financially sound decision. And they must not have found it necessary to include the unused connections in the schematic.