[sdiy] Bi-colour LED

[Jaroslaw Ziembicki]

----- Original Message -----
From: "Rob Keeble" <rob at emulatorarchive.com>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Friday, July 02, 2004 9:27 PM
Subject: [sdiy] Bi-colour LED


> Hi,
> I have found some rather nice blue/red bi-colour LED's (3 lead common
> cathode) which I'd like to use for monitoring CV/signal amplitude in my
> Modular synth. Red for + and blue for - voltages. Any ideas on how I can
use
> an Op Amp to drive these LED's, all the circuits I have seen are single
LED
> or 2 lead bi-colour.

Hello,
You will need 2 opamps, 2 diodes and 5 resistors.
I can send you the schematics if you want.

Regards,
Jarek