Caple C871i Bedienungsanleitung PDF herunterladen (Seite 38)

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????

Date: Sat, 14 Mar 1998 18:36:36 -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."

> First, what value of resistor should be added? The ad says these are 2

> volt LEDs, and that 20 milliamps should flow through the LED.

> Will the 20 milliamps affect the read/write performance of the drive in

> any way?

Since you would be sticking a 20ma load onto a 74LSxxx TTL output

in each case, the odds are pretty good that Read and Write data would be

screwed up.

One idea is to use a couple general purpose PNP transistors. The

LED GND lead goes to GND. The Red lead goes through a 150 or so Ohm

resistor to the Collector of the "Write Transistor". The Green lead goes

through a 150 or so Ohm resistor to the Collector of the "Read

Transistor". Each transistor's Emitter goes to +5V.

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 38 of 572

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