[sdiy] audio control of momentary sw

[Paul Perry]

I had to do this once, and just used a 555 configured as a one-shot.
If the audio is high enough, it triggers.
(555 drove a relay via a power mosfet, but that was because I was
driving a large solenoid - I think a 555 can probably drive a small
relay by itself, or certainly via a transistor.)

paul perry Melbourne Australia

----- Original Message ----- 
From: "Adam Inglis" <21pointy at tpg.com.au>
To: "SYNTH DIY" <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, February 03, 2011 2:31 PM
Subject: [sdiy] audio control of momentary sw


> What's a neat simple way of interfacing an audio signal to close a
> momentary switch?
>
> The scenario is: I'm wanting a dedicated track of audio pulses on my
> DAW to replicate the front panel momentary switch on an old Casiotone
> keyboard. The switch closes a matrixed line (5 volt signal) that is
> polled by the CPU ("pattern stop - start").
>
> I'm thinking an op-amp to a CMOS bilateral switch. Any one-chip
> solutions?
>
>
>
> regards
> Adam Inglis
> http://www.adambaby.com
>
>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy


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