[sdiy] recycle question

[The Peasant]

Quoting Rude 66 <r.lekx at chello.nl>:

> 
> i have a recycle question. i've taken the complete display section (well, a
> bunch of green and red led's on its own circuit board with ic's etc) out of
> an old cassette deck. it was connected to the main board with a 5 wire
> small
> flatcable, which is still there.
> 
> i'd like to use this in something.. volume indication in a synth, filter
> indication..etc. does anyone know how to drive this thing? i figure of the
> 5
> inputs to the circuits, one is ground, one is power, and 2 are left and
> right input. what sort of power does it take? could i just hook this up to,
> say, a 9v battery and an audio output of some sort and get it to work? or
> is
> this hopelessly simplistic? the 2 driver ic's are sharp ir2e19's, but there
> are no datasheets anywhere..
 
I've done this before and it should work fine. Preferrably one would measure 
the power supply of the cassette deck feeding the pcb before it has been 
removed, in order to set the supply voltage correctly, but 9V should be OK. 
Checking the LED current will make sure that you are where you should be. Then 
just buffer the input signals for the display levels that you want.

Take care,
Doug
______________________
The Electronic Peasant

www.electronicpeasant.com