Caple C871i Manual de usuario descargar pdf (Pagina 94)

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Apple II Computer Info

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From: Rubywand <[email protected]>

Newsgroups: comp.sys.apple2

Subject: Re: Bi-color red/green LEDs: Disk II read/write?-- update

Date: Fri, 20 Mar 1998 19:32:47 -0600

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stephen e buggie writes ...

> A store is clearing out bi-color LEDs red/green. These LEDs have three

> wires: black (negative), red (red +), green (green +).

> I want to add the bi-color LED to my Disk II drives, so that it will glow

> GREEN for READ, and RED for WRITE. I already have an AE 3.5" 800K drive

> that does this, and it looks nice. This will be a third enhancement to

> Disk II --- "Super Bugg-Drive."

> ....

Since the last post, there was a chance to do some experimentation.

The circuit below seems to work well ...

NPN transistor Collector to Bi-color LED center

NPN Emitter to GND

NPN Base to two 3300 Ohm resistors

One resistor goes to GND

The other resistor goes ULN2003 pin 15 (connect to R2 at point

closest to ULN2003)

LED Red (lead has right-angle at LED) to 150 Ohm resistor

Resistor goes to pin 6 (Q output) of a 74121 One-Shot IC

LED Green (lead has slant-angle at LED) to 150 Ohm resistor

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 94 of 572

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Caple C871i Manual de usuario Pagina 94

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Caple C871i Manual de usuario Pagina 94

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