[sdiy] recycled led volume bar

[john mahoney]

got any part #s?
--
john


----- Original Message ----- 
From: "Rude 66" <r.lekx at chello.nl>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Monday, November 29, 2004 5:33 PM
Subject: [sdiy] recycled led volume bar


>
> i've pulled the display bar out of an old cassette deck. it includes the
> whole circuit board with driver chip, etc. (all sony stuff). i'd like to
use
> this in some future project as a volume indicator or something similar,
but
> i'm having a hard time getting it to react to incoming audio.
> there are 4 input wires: l and r (which i assume are for the audio
> left/right parts), 5v and 'e'. the display bar works when i put +5v to the
> '5v' input, and hook the 'e' up to gnd. but that makes all the led's light
> up, and giving it audio input doesn't do aynthing. putting a pot in the 5v
> line does reduce the amount of led's lit, but even with a 1k pot there's
> only like 3 different 'settings'.
>
> i'm obviously doing something wrong here.. can anyone point me in the
right
> direction how to hook this up?
>
> thanks!
>
> r./
>
>