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  • September 15, 2009 at 11:01 pm in reply to: Convert old Deluxe Memory Man from AC to DC power #101508
    riversitter
    Member

    One last update for closure.

    I reverted my mods back to use the original internal transformer and everything still works fine. So the good news is apparently I didn’t fry anything. The bad news is the pedal is still noisy whether on or off. So for now I’ll be using a true-bypass looper and when I get some time I’ll pursue this idea again or maybe send it to a pro for some kind of noise reduction solution. Or maybe I’ll just spring for a Memory Boy and save some pedalboard space…

    July 26, 2009 at 8:45 pm in reply to: Convert old Deluxe Memory Man from AC to DC power #99999
    riversitter
    Member
    Quote:
    This was a really nice thread… What happened?

    I am looking at this thread myself and trying to understand whether the problem was in the plan or the execution. Did he apply +24V where he should have applied -24V? I’d like to do this myself and make it into a photo essay. Could someone take a second look at this and make sure the logic is correct?

    J

    Hello J-

    I have not given up on this. My intention was to share more detailed instructions about this mod if I was successful. I do not think the issue is my execution. I am almost positive that somehow my logic is not correct. However, I do think the polarity in my updated post is correct. I think the issue may have something to do with the original power supply being dual supply voltage which I do not completely understand. I am thinking about trying the DC power before the rectifier rather than after to see what happens. I have been researching this but I just haven’t had a chance to pull out the soldering iron yet. If anyone has thoughts about this I’d be glad to hear them. Otherwise I’ll update this topic when I have anything new to report.

    March 22, 2009 at 10:04 pm in reply to: Convert old Deluxe Memory Man from AC to DC power #94795
    riversitter
    Member

    Update:

    Well, unfortunately wiring up things as shown in my last diagram did not work for me.

    I bought an Electro-Harmonix 24VDC 100mA (positive tip) wall wart and tried it after making the mods but no joy. No power LED and no working effect from the pedal. Bummer.

    I also noticed the Electro-Harmonix wall wart is putting out 32VDC instead of 24VDC.

    As an alternative I am considering using a 24VAC wall wart and hooking up the AC output before the bridge rectifier as was the case with the internal transformer.

    I’m researching to try to diagnose the issue but I suck at troubleshooting. But I have been learning a lot. :facepalm:

    March 15, 2009 at 8:49 pm in reply to: Convert old Deluxe Memory Man from AC to DC power #94550
    riversitter
    Member
    Quote:
    Drawing looks fine now. The 2N6111 is used for regulation, but it’s not an actual regulator. The combination of parts connected to it forms what’s called a “series regulator” circuit. Let us know how it turns out.

    Thanks again EH Man. I’m going to do this mod as soon as I get a power jack. I’ll come back and let you know how it sounds after the mod. I am crossing my fingers that some of the hum goes away since I really love the tone of this pedal.

    March 15, 2009 at 8:20 pm in reply to: Convert old Deluxe Memory Man from AC to DC power #94545
    riversitter
    Member
    Quote:
    The vintage 5-knob Deluxe Memory Man uses a positive ground power supply. You’ll need to reverse the red and green wires coming off the jack. The red wire does to the LED and the green wire to the rectifier pin.

    Thanks for the reply EH Man. So I guess I’m not completely off-base in the way I am approaching this. I think I understand “positive ground” now after a little research. I have updated my drawing to reverse the positive and negative coming from the DC power supply.

    DMM_DC_convert_mod_02.png

    I think my primary question now is what regulates the power to -15V which is what appears in the schematic? Is it the 2N6111?

    Thanks again.

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