[sdiy] recycled led volume bar

[Rude 66]

sure. the display is a 16-bar stereo display with '9n609' printed on the
back., the driver chip is a sony msl935 or 9351 (not sure if it's a line or
a '1'.. same for the rest: '1896' or '896'. 4 transistors:  a952 L2154. the
rest is some resistors, 2 caps and jumpers..

and paul, it was taken from a tape deck, where it reacts to incoming audio
signals.. or would there be an audio-dc conversion inside the deck first?

r./




----- Original Message -----
From: "john mahoney" <jmahoney at gate.net>
To: "Rude 66" <r.lekx at chello.nl>; <synth-diy at dropmix.xs4all.nl>
Sent: Monday, November 29, 2004 11:50 PM
Subject: Re: [sdiy] recycled led volume bar


> 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./
> >
> >
>