Re: [AH] Pearl SC40 membrane buttons

From Brian Willoughby
Sent Fri, Jan 26th 2018, 00:06

The =E2=80=9Cremote=E2=80=9D box was my first thought, too, but how to =
get a cable through the original case would be the challenge in my =
opinion. The panel board must connect to the main board with a ribbon =
cable or some other standard connector, so a cable could be made to =
adapt the original connection to a custom one. Some kind of circular, =
multi-pin connector would be ideal, but I never like drilling extra =
holes, not even on the back panel.

Maybe the cassette interface jacks are not needed? I assume the SC40 has =
SysEx support that totally replaces cassette storage.

An alternative would be to manufacture a new MIDI board, but leave out =
the MIDI thru jack and replace it with a different circular, multi-pin =
connector. That would be totally reversible.


On the topic of re-engineering costs, all it really takes is for one =
person to love their Pearl SC40 enough to pay several hundred dollars =
for the up-front design work. Then the PCB Gerbers could be shared with =
the community so that additional ones could be made without new =
engineering work. Once all the measurements are made and confirmed, =
making duplicates is a lot less expensive. It could even be a kit, =
although kits have annoying overhead for the central person.

The problem with estimating demand is that a lot of potential exists, =
but when it comes down to actually forking over the money the market =
suddenly shrinks. That unpredictable market shrink raises the effective =
per-unit price, and then more people drop out when they learn that the =
actual price is higher than predicted. It=E2=80=99s far easier when =
someone with deep pockets just takes that big first step. Subsequent =
steps are cheaper and more predictable. Ideally, if a little profit is =
made on the duplicates, then the original buyer can be slowly reimbursed =
for their huge leap, dropping their cost.

The thing is, there are so many old synths where modern updates =
=E2=80=9Cshould=E2=80=9D enjoy some amount of demand. In one sense, =
custom upgrades or retrofits are =E2=80=9Ceasy,=E2=80=9D it=E2=80=99s =
just predicting which ones will actually succeed, and at what price =
point they wouldn=E2=80=99t represent a loss for the maker. I still have =
a Prophet 5 Rev 2 upgrade board design on the back-burner. In that case, =
I=E2=80=99m the sucker willing to pay for the first one, hoping that =
more people will want a copy. But it seems that I=E2=80=99ll never =
finish that project...

Oh, the first-world problems!

Brian Willoughby
Sound Consulting


On Jan 25, 2018, at 9:37 AM, Andrew Scheidler <xxxxxxxx@xxxxx.xxx> =
wrote:
> I looked at some pics...  there's only about 14 buttons; maybe a =
little "remote" button box could be made that could connect via a cable =
and a connector on the backside?
>=20
> Then there would be no defacing of a rare and nice looking unit...?
>=20
> Drew
>=20
> On Thursday, January 25, 2018, Peter Forrest <xxxxxxxx@xxxxx.xx.xx> =
wrote:
>> Cheers Drew.
>>=20
>> I wonder how many of these SC-40s and SC-20s were made.
>>=20
>> The likelihood is that all of the buttons on them are deteriorating =
by now, so there must be a demand for a whole new panel... but probably =
too small a demand to make it economic to re-engineer the board.
>>=20
>> But they do sound great, and they are nowhere near as expensive as =
the Syncussion.
>>=20
>> Peter
>>=20
>> =20
>>=20
>> From: Andrew Scheidler [mailto:xxxxxxxx@xxxxx.xxx]=20
>> Sent: 25 January 2018 10:55
>>=20
>> Depending on how many buttons there are, you can just ("just") wire =
panel mount buttons the the PCB and mount those to the existing panel.  =
Of course it depends on what else is on that panel, how much spare room =
is in the enclosure, etc.
>>=20
>> I took a MMT-8 sequencer, wired in 45 new momentary buttons and put =
the whole mess in a metal box.  It was ugly, but worked perfectly :-)
>>=20
>> Drew
>>=20
>> On Thursday, January 25, 2018, Peter Forrest <xxxxxxxx@xxxxx.xx.xx> =
wrote:
>>=20
>> Cheers Tony
>> I'll mention it to the tech and see what he thinks.
>> Peter
>>=20
>> -----Original Message-----
>> From: Oakley Sound [mailto:xxxxxxxxxxx@xxxxxxxxxx.xxx]
>> Sent: 25 January 2018 08:47
>>=20
>>  > Anyone have any ideas?
>>=20
>> The crazy thing to do would be to reverse engineer and remake the =
whole front panel board to suit proper tact switches. At least two days =
work which probably wouldn't be worth it unless you could sell the PCBs =
to other folk.
>>=20
>> However, it may be possible to pull the existing front panel board =
back a bit, and make and fit a daughter board that could take modern =
tact switches. I've not seen the insides of one for a couple of years =
though so there maybe not enough room to do this.
>>=20
>> They're well worth saving.
>>=20
>> Tony
>=20