Solid state relays are kinda expensive. I don't know much about transistors
either, but I have been reading up in wiki, and it says they're used as
amplifiers, but also as on/off switch. A voltage sent to the base will allow a
charge to pass between the emitter and collector. I'll try using a transistor as
a switch and let you know if it works. If it does, it's a really cheap
alternative to a relay.

--- In CasioSK@yahoogroups.com, Comrade Cal <stolenfat@...> wrote:
>
> i dont really know if a transistor would work- but they our kinda out of my
area of knowledge... not to good with them yet.  But i generally look at them as
small amplifiers. I think you need more of an on off switching mechanisim, might
as well try the relays first, and then go another route.
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> ---------------------------------------
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> home made noise and electrical ill-logic
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> http://circuitgrizzly.awardspace.com
>
> --- On Sun, 3/15/09, dirtyoldpoo <dirtyoldpoo@...> wrote:
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> From: dirtyoldpoo <dirtyoldpoo@...>
> Subject: [CasioSK] Re: How do you use an LFO to trigger a bend?
> To: CasioSK@yahoogroups.com
> Date: Sunday, March 15, 2009, 4:21 PM
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> Can you use a transistor instead of a reed/relay? It seems like
that's what this guy did:
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> http://gieskes. nl/circuitbendin g/?file=casio_ vl_tone
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> --- In CasioSK@yahoogroups .com, "stolenfat" <stolenfat@ ..> wrote:
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> > you could use the 555 to trigger a small reed or ss relay.
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> > Find a simple LED blink circuit, and put the relay in line with the led. Or
find an led relay driving schematic some where. Then play with the values untill
you get it work nice, i recommend break boarding it first, then toss it onto
protoboard.
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> > --- In CasioSK@yahoogroups .com, "dirtyoldpoo" <dirtyoldpoo@ > wrote:
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> > > Hi all,
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> > > so I bent my casio sk-1 and I know how to build an LFO using a 555 timer
ic. I found two points on the sk-1 pcb that when shorted trigger the
one-key-play button. I want to be able to control the continuous rate at which
the one-key-play is triggered via an LFO, but I can't use a photoresistor
vactrol because at higher rates photoresistors don't react fast enough and the
LFO fails.
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> > > So my question is what's the alternative to the vactrol?
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