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 Forum index » DIY Hardware and Software » Circuit Bending
BOSS SP-202 Sampler Circuit bend
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mINdprINt



Joined: Mar 12, 2007
Posts: 1
Location: Belgium

PostPosted: Mon Mar 12, 2007 4:18 am    Post subject:  BOSS SP-202 Sampler Circuit bend
Subject description: BOSS SP-202 Sampler Circuit bending advice needed
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Hi,

I have bent and modified a few instruments before. I have recently acquired a BOSS SP-202 sampler and have been having no luck yet with circuit bending it. Has anyone here tired and succeeded in bending this unit?
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Mikmo



Joined: Dec 01, 2005
Posts: 150
Location: Copenhagen - Denmark

PostPosted: Tue Mar 13, 2007 12:54 am    Post subject: Reply with quote  Mark this post and the followings unread

If this device is using some kind of DSP chip, which many modern effects and samplers does then bending it is very difficult (read almost impossible), and potentially dangerous for the device.

The problem is that a DSP chip is basically a small microprocessor running embedded software, which makes messing with it almost impossible.

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Mikael
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gmeredith



Joined: Jun 28, 2006
Posts: 82
Location: Tasmania, Australia
Audio files: 1

PostPosted: Thu Mar 29, 2007 9:43 pm    Post subject: Reply with quote  Mark this post and the followings unread

It still should have separate RAM chips in it, though, which means you should be able to do some good sample-grinding bends to it. Open it up and see if you can find any separate chips in it, write their numbers down and do a google search. It should lead you to links describing it. In a machine such as the sp202, you are looking for online RAM descriptions such as SRAM , NVSRAM etc. Any of those appearing in the search result will confirm the RAM chip.

Cheers, Graham
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Mikmo



Joined: Dec 01, 2005
Posts: 150
Location: Copenhagen - Denmark

PostPosted: Fri Mar 30, 2007 5:06 am    Post subject: Reply with quote  Mark this post and the followings unread

Graham is perfectly right about the RAM chips, just be very carefull about which pinns on the RAM chips you mess with. Stay away from the power pinns, and don't apply power to the other pinns. But otherwise you could possibly get som cool stuff.

I heard of at least two different people who circuit bend old portable CD players, by messing with the RAM chips used for the anti shock read ahead function. The sounded delightfully awfull Smile

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larrytopsoil



Joined: Jun 15, 2012
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Location: usa

PostPosted: Fri Jun 15, 2012 5:47 am    Post subject: wouldn't recommend it
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I had an sp202 and attempted to bend it after glitching out a few old casio keyboards and such. Now the sp is on a shelf in my studio in pieces. A friend of mine who is a genius with electronics soldered in a new capacitor I burned out but it still will not work right. I did something to the main chip that will not allow it to play back sound. It appears to record and work as normal but no sound at all. I'd say leave it be, or if you do bend, don't touch the main chips. Mines destroyed. 100$ in the trash.
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jksuperstar



Joined: Aug 20, 2004
Posts: 2478
Location: Denver
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PostPosted: Fri Jun 15, 2012 3:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

It will be difficult to do this safely. More recent chips use lower power, due to lower voltages, etc. They are sensitive to the voltage applied.

You may have much more success keeping the SP-202 internals as-is, but merge it with some other bent devices. So you can add repeat, reverse, resampling, and patterns to what might otherwise be a non-repeatable pattern generator or noise maker (half the joy, but in many cases also half as useful).

Or, do something creative with the triggering mechanism, to use audio to retrigger other samples, etc.
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