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A/DA Flanger no sound with pedal engaged

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  • A/DA Flanger no sound with pedal engaged

    I'm very unskilled at pedal repair so asking for a little help.

    The bypass mode passes guitar signal but with the switch engaged there's no sound except for just a very small noise while sweeping the enhance control. Otherwise it's silent.

    I've given it a visual inspection and read 20v on the secondary of the transformer. Not even sure where to go from there.

    Thoughts?
    ~Semi-No0b Hobbyist~

  • #2
    Since you can hear some sound at the output I would guess the problem is at the input. The enhance pot feeds the output back into the delay chip.
    Maybe a bad 3403 op-amp or missing power supply voltage. It's split 4 ways, at least on this schematic. Yours might be a different version.
    ADA-Flanger-schematic-10-186p-rev-D.pdf

    Comment


    • #3
      Apparently there is also a re-issue version. I don't think it would have the SAD1024 like in the schematic posted above.
      "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

      Comment


      • #4
        It has 10-205P molded into the inside of the enclosure. Doesn't have a sad1024.

        225615 appears to be a serial number on both the back panel and the circuit board.

        Just noticed this resistor on the trace side of the board. Possibly done at the factory? Appears to match the existing work. The one on the underside is positioned where the one on the top looks like it was supposed to be. Perhaps a board layout mistake that was fixed in this manner?




        ~Semi-No0b Hobbyist~

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        • #5
          http://adadepot.com/index.php?topic=148.0
          Schematics and Mods
          ADA Effects
          https://elektrotanya.com/showresult?what=ADA
          Who does not know and knows that he does not know - teach him Confucius)
          Who knows and does not know that he knows - wake him Confucius)

          Comment


          • #6
            Maybe one of the 10-189 or the 10-185 schematic, see attached
            Attached Files
            "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

            Comment


            • #7
              Originally posted by g1 View Post
              Maybe one of the 10-189 or the 10-185 schematic, see attached
              Didn't see a match but there's good info in there. Thank you. Looks like mine might fall around 1980 according to the serial number.

              That ADA board isn't allowing new registration, fwiw. Has current posts though.
              ~Semi-No0b Hobbyist~

              Comment


              • #8
                Originally posted by mort
                #7
                That ADA board isn't allowing new registration...
                http://adadepot.com/index.php?action=register
                Please note "Depot New Registrations Temporarily Suspended" Please see discussions for how to register.
                1)
                Click image for larger version  Name:	News.jpg Views:	0 Size:	142.6 KB ID:	936842
                2)
                https://aronnelson.com/diywiki/index.php/ADA_Flanger

                https://docplayer.net/37550920-Ada-flanger-clone-build-documentation-mn3007-version-pcb-rev5-january-2010-updated-feb-2012.html

                http://moosapotamus.net/images/FlangerClone_SCH_rev5_MN3007_jan2010.gif
                Click image for larger version  Name:	FlangerClone_SCH_rev5_MN3007_jan2010.gif Views:	0 Size:	109.8 KB ID:	936863

                https://www.eserviceinfo.com/downloadsm/52170/ADA_flanger.html

                ADA-Flanger-schematic-10-186p-rev-D.pdf
                Last edited by vintagekiki; 07-18-2021, 02:37 PM. Reason: 2)
                Who does not know and knows that he does not know - teach him Confucius)
                Who knows and does not know that he knows - wake him Confucius)

                Comment


                • #9
                  Here's the layout, fwiw. Has the MN3010.

                  https://flic.kr/p/2mbZsPh

                  ~Semi-No0b Hobbyist~

                  Comment


                  • #10
                    Originally posted by mort
                    Here's the layout, fwiw. Has the MN3010.
                    Schematics for Ada flanger with MN3010 see g1 post #6

                    ada_flanger_schematics.zip
                    ADA-Flanger-10-189-MN3010BBD-starting-with-pn-227331
                    Who does not know and knows that he does not know - teach him Confucius)
                    Who knows and does not know that he knows - wake him Confucius)

                    Comment

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