[sdiy] DIY slide-bars

[Grant Richter]

It doesn't have adhesive on it. It is self fusing (sticks to itself).

One side has a protective film cover that can be removed, but no adhesive
underneath.

> From: "William Inman" <theinmans at mindspring.com>
> Reply-To: theinmans at mindspring.com
> Date: Wed, 28 Jul 2004 18:28:21 -0400
> To: "Grant Richter" <grichter at asapnet.net>, synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] DIY slide-bars
> 
> Grant, et. al.,
> 
> For a 2-page pdf spec sheet on the Scotch No. 13 tape, go to www.3m.com and
> type "Scotch #13" in the search field (with the number sign and without the
> quotes).  The first result will take you to a very interesting 2-page
> summary of the tape.  Grant, is the tape sticky enough to be stuck to
> something like a thick piece of plastic or even wood?
> 
> Elliot
> 
> 
>> [Original Message]
>> From: Grant Richter <grichter at asapnet.net>
>> To: Gene Stopp <gene at ixiacom.com>; <synth-diy at dropmix.xs4all.nl>
>> Date: 7/28/2004 5:56:57 AM
>> Subject: Re: [sdiy] DIY slide-bars
>> 
>> Scotch No. 13 Semi Conducting Electrical Tape. Mouser has it. I just
>> measured it at 5K per inch.
>> 
>> The make the tape for over wrapping high voltage splices to drain away
>> electrostatic charges.
>> 
>> It is soft material though.
>> 
>>> From: Gene Stopp <gene at ixiacom.com>
>>> Date: Tue, 27 Jul 2004 17:24:27 -0700
>>> To: synth-diy at dropmix.xs4all.nl
>>> Subject: RE: [sdiy] DIY slide-bars
>>> 
>>> I've done two experiments with two different types of material.
>>> 
>>> First experiment: black antistatic bag material (opaque and rubbery),
> cut
>>> into a strip. Second experiment: conductive rubber cord (maybe 1/8"
> dia.)
>>> used for EMI gaskets. Both of these materials had a fairly high
> resistance
>>> per distance (several K per inch). What this caused is non-linear
> behavior
>>> and moving voltage points (i.e. yesterday 2 volts may be right *here*,
> and
>>> today it's over *here*, a couple inches away). Something like the Moog
>>> controller is more stable and repeatable, meaning you could mark the
>>> fingerboard with the voltages and they'll always be at the same places.
> I
>>> think it's because the resistive element was a pretty low resistance,
> driven
>>> by higher current. This would imply some kind of heating element wire,
> like
>>> in an electric heater. It may be only a couple of ohms so something
> like a
>>> power regulator might be needed, perhaps configured in constant current
>>> mode.
>>> 
>>> I've not run across such an element yet but I do have a note to self to
> be
>>> on the lookout for the next trashed bathroom heater or hairdryer.
>>> 
>>> - Gene
>>> 
>>> 
>>> -----Original Message-----
>>> From: owner-synth-diy at dropmix.xs4all.nl
>>> [mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Rainer Buchty
>>> Sent: Tuesday, July 27, 2004 6:57 AM
>>> To: Magnus Danielson
>>> Cc: synth-diy at dropmix.xs4all.nl
>>> Subject: Re: [sdiy] DIY slide-bars
>>> 
>>> 
>>>> 1) How did these classic slide bars work? What materials etc. was
> there?
>>> 
>>> In the Elektor magazine they just used graphite, i.e. you literally drew
>>> the slide bar, but then had a metal probe for sliding so your finger
>>> stayed clean :)
>>> 
>>>> 2) How could one make one today? I am looking for a fairly stable
> design,
>>> so
>>>> antistatic foam is out, OK?
>>> 
>>> I wonder if recording tape could be used in a setup like this:
>>> 
>>> ========    cover foil
>>> --------    recording tape
>>> ________    copper or some other conductor
>>> 
>>> The copper is attached to some sensible voltage. The recording tape
>>> basically acts as a trimmer, so that touching -- thus closing the
>>> contact -- is equivalent to the wiper. Now you take the difference (or
>>> better: the ratio) between the voltages measured at the ends of the tape
>>> and get the tap position. Could probably be further refined if the tape
>>> is crescendo-shaped.
>>> 
>>> (I'm quite sure people on this list have done something like this before
>>> and can tell me why that's a bad idea.)
>>> 
>>> Rainer
>