'AW: Digital pot / attenuators?'
>Von: Robert Zeff[SMTP:AINET.COM] rzeff
>Gesendet: Mittwoch, 9. April 1997 02:46
>Betreff: Digital pot / attenuators?
>I need to attenuate an audio signal. I need something like the
>AD7112 LogDac, but it's a bit pricey ($>10.00 and requires lots
>of I/O lines. I need to handle signal swings of +/- 10 volts.
>The Dallas parts are neat (I2C) but they only handle 0 - 3 volts.
>Also, I need at least .5 db steps, say 0 to -80dB.
You can use an optocoupler to attenuate a signal.
The led of the coupler can be driven by a simple R2R-like network from
But you have to linearize the attenuation by yourself. This can be a
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