Roland - AD-50 ( Double Beat )  [schematic]

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...
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Nocentelli
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Post by Nocentelli »

Ignore that last point, I misread the diagram on my tiny phone screen.
brownwhopping wrote:How can I learn by reading threads an making circuits, when some day I can see a lawsuit or somebody beat me in the face for that?

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Post by jzilla »

Nocentelli wrote:Happy new year! Yes, diagram is ok now, but I would disconnect the two ring lugs on the jacks (but leave the input ring connected to power negative): This way, you only need to unplug the input to cut the battery power.
Thanks. I've been trying all day to understand this but can't figure it out! Do you mean disconnect the input and output jack sleeve connection? Sorry for being obtuse!

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Post by jzilla »

Nocentelli wrote:Ignore that last point, I misread the diagram on my tiny phone screen.
Ha! I totally missed this post. Cool. Thanks again for your help. Can't wait to finish this build and hear this thing. ...This community is awesome.

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Post by jzilla »

still plugging on this... no sound yet.

i just noticed that the vero layout says the pinout is CBE! is that right? which transistors is this layout using? i thought they were SC1000s which AFAIU are ECB.

thanks!
-j

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Nocentelli
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Post by Nocentelli »

2N5088/9, 2N3904 pinout.
brownwhopping wrote:How can I learn by reading threads an making circuits, when some day I can see a lawsuit or somebody beat me in the face for that?

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Post by jzilla »

jzilla wrote: Wiring Diagram v3:
[ Image ]
-j
WARNING: i got the battery/DC section wrong here. battery got VERY hot. still troubleshooting. :oops:

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Nocentelli
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Post by Nocentelli »

Is it just a short on the switching dc jack through swapping ground a battery +ve? I've heard that can happen :wink:
brownwhopping wrote:How can I learn by reading threads an making circuits, when some day I can see a lawsuit or somebody beat me in the face for that?

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Post by jzilla »

Nocentelli wrote:Is it just a short on the switching dc jack through swapping ground a battery +ve? I've heard that can happen :wink:
haha. yeah, i think so. looks like i connected battery neg to DC tip instead of DC sleeve. still no go on the pedal though! not even an LED light... tested the battery and it's good. double checked the wiring, checked the vero layout and electrolytics orientation. also used the MM to test the switch continuity!

i guess next step is to reflow all solder? even if the trannies were fried (will test those as well) the LED would still get power, right?

thanks!
-j

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Post by jzilla »

i mean i connected bat neg to DC sleeve instead of DC tip. :/

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Post by jzilla »

Resurrecting this thread after having given up for nearly two years.

Today I decided to take another stab. Turns out my issue is coming from the rotary switch. I really can't understand why. Attached is a picture of what I'm doing with it (mounted to another vero board to deal with space limitations). Maybe I need to ground it?
image.jpeg
Another thought I had is to use a small 3 way toggle instead.

Appreciate any suggestions!

Thanks!
-j

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Post by jzilla »

P.S. Here's the rotary switch I'm using
http://smallbear-electronics.mybigcomme ... 1240801556

Thanks!
-j

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Post by jzilla »

I think I'm close. I swapped out the rotary switch for a SP3T. That's working now.

But the LED only works when a battery is plugged in regardless of whether i'm using DC power or not. Would someone mind taking a quick look at my wiring diagram and tell me what I'm doing wrong? I keep hitting the wall of my knowledge, not hard to do.
AD50 Wiring Diagram v5.jpg
Hugely appreciated!
-j

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Post by johnk »

i built one a while ago and i really dig this fuzz:
Attachments
doublebeat-01.jpg

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Post by johnk »

and here's my layout for it:
Attachments
001-DoubleBeatFuzz Layout.png

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Post by jzilla »

Wow! That looks incredible. There is some real skill on this forum.

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Post by jzilla »

Solved it! Here's the working wiring.
Cheers!
-j
AD50 Wiring v6.jpeg

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Post by aishabag23 »

jzilla wrote:Solved it! Here's the working wiring.
Cheers!
-j
AD50 Wiring v6.jpeg
Awesome! It always feels good to finally figure it out. :applause:
Loe Sounds

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Post by jzilla »

aishabag23 wrote:Awesome! It always feels good to finally figure it out. :applause:
Thanks! It really does. I've learned a ton debugging this project.
-j

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