[sdiy] Roland Filter Module ( for Juno106&friends )

[Nicholas Gregorich]

Ah see, from my perspective a success story would be salvaging an IR3109.  I was able to open a few 80017As with various cutting devices enough to see what was going on inside, but the IR3109s break much easier than the BA662s.

So you're right, from a learning point it was a success, but I was thinking of reusing those old parts.

Nick.

On Tuesday, April 11, 2006, at 09:35PM, harrybissell <harrybissell at prodigy.net> wrote:

>Hi Nicholas...
>
>Nicholas Gregorich wrote:
>> 
>> I would think that if a solvent could eat the epoxy it would surely eat at least plastic packages as well.
>
>
>actually it can be done. Most of the old school potting epoxies could be
>dissolved.
>
>Plan on becoming an expert "forensic engineer" if you do it. Crow had
>some
>photos on his site of the process.  It is NOT for the faint of heart.
>
>> 
>> Would heat + chisel cause damage?
>
>Hell, yes. I bought the Gentle Electric with the understanding it was
>'as-is' because of an inability to test. When I got it... it was clear
>that
>someone was aware that it was VERY hurt and had tried to repair it.  OK
>I bought it for two reasons...
>
>1) I wanted it in 1976 when I could not afford it
>2) I wanted to know if it would work, or how it works
>
>Once I decided the module was toast... who cares if the chisel and torch
>do more damage.  I cracked the potting case off it, and the torch melted
>the solder.. causing the epoxy to lose grip on the foil side of the
>board.
>With the circuit that was NOT potted, I could infer what was on the
>component
>side of the board by looking at the foil... ~and~ metering the circuit.
>I also
>has a good guess of what I might expect to find.  
>
>I consider the effort a success...
>
>1) I ahve a working unit
>2) I know HOW it works
>3) I know that, had I bought in 1976 when I could NOT afford it, that I
>   would have been sorely disappointed.
>
>Is that worth $250 + shipping and nnn years subtracted from your life
>??? :^P
>
>knowledge is its own reward... worth the time and effort, is a judgement
>call.
>
>I say, CUT 'EM UP !!!
>
>H^) harry
>
>
>> 
>> Definitely not worth the time nor effort, especially with chemicals that dissolve epoxy.  Imagine an accidental spill!
>> 
>> Nick.
>> 
>> On Tuesday, April 11, 2006, at 08:44PM, harrybissell <harrybissell at prodigy.net> wrote:
>> 
>> >Ask "Old Crow" (aka Scott Rider) what he uses to unpot 'potted' modules
>> >
>> >rest assured you will suffer a lingering death from cancer for your
>> >knowledge... but in the grand tradition of wizardry... did you expect
>> >something
>> >for nothing ???   :^P
>> >
>> >H^) harry
>> >
>> >Nicholas Gregorich wrote:
>> >>
>> >> I've tried doing this with about 8 or 9 80017As.  I have been able to recover a couple BA662 but the IR3109s break very easily.  I tried a couple brute force methods but I never tried any solvents.  I doubt its possible to "clean" the epoxy off, as we use DP-270 potting epoxy at work for anti-tamper reasons.
>> >>
>> >> Good luck with your chiseling and please report any progress!
>> >>
>> >> Nick.
>> >>
>> >> On Tuesday, April 11, 2006, at 02:23PM, Tom Arnold <xyzzy at sysabend.org> wrote:
>> >>
>> >> >By any chance has someone chisled off the cover of a Roland 80017A module?
>> >> >I know at one time there was a guy selling a module that would replace the
>> >> >VCAs but use the IR3109 in the partially bad original module.  One of my
>> >> >filters is "noisy" ( crackles after it warms up ) and I was pondering
>> >> >attempting to try a hack fix on it, maybe using a BA6110 and see how it
>> >> >sounds.
>> >> >
>> >> >--
>> >> > -----------------------------------------------------------------
>> >> > - Tom Arnold       -  Free Synth DIY webspace http://www.sdiy.org
>> >> > - SynthGeek        -
>> >> > - BBD Fanatic      -  "...is it a virus, a drug, or a religion?"
>> >> > - echo evho wjxo   -    Juanita Shrugs. "What's the difference?"
>> >> > --------------------
>> >> >
>> >> >
>> >> >
>> >
>> >
>
>