Caple C871i Manual de usuario descargar pdf (Pagina 54)

Apple II Computer Info

The accessories can be connected to a Molex-4 female socket via

a Molex-4 male plug. For 5v DC accessories, use two pins (red and black).

For 12 DC accessories, use two other pins (yellow and black). I have

Molex-4 male plugs (including crimp pins) available as an option for $0.75

each, five for $3.00. With 6 ft twin wire attached, $1.00 each, or five

for $4.00. Specify whether the plug should be wired for 5v or 12v

accessories.

Accessory plugs are handy and they do not interfere with the

computer's operation. Most radios, etc. that use four batteries (6v DC)

will work fine on the carefully regulated 5v DC output. I have attached

an electric pencil sharpener, transistor radio, cassette player,

radio-cassette, DC mini-drill, etc. to these power supplies. Running

those appliances can be done concurrently with computer operation. There

is plenty of power to spare!

COOLING FAN NOISE

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Fan noise is part of IBM folklore; all of us have seen IBM PCs

that

sounded like reincarnated vacuum cleaners. Ball-bearing fans are quieter

than sleeve fans. The IBM fan is powered from the +12v DC line. This fan

differs from the AC 110v fan in Apple II System Savers. These options are

available:

(a) Position the IBM power supply at a distant corner below the computer

desk

so that its audible sounds are unnoticed.

(b) Remove or disconnect the fan. Most IBMs run cool with Apple II

because

the load is only 1/3 the power supply's capacity. The fan could be

disconnected or removed but this is NOT recommended.

SPEED KNOB. This is a five watt wire-wound heavy-duty potentiometer of

100-500 ohms resistance. The potentiometer is wired in series with the DC

12 volt fan, and is mounted on the casing. With this knob, fan noise can

be reduced by running the fan at a slightly slower speed. The fan should

be started at FAST speed, then dialed back to a quiet slower speed. The

user should ensure that the fan is spinning during use; do NOT totally

shut off the fan. It is insufficient to slow the fan merely by moving the

red (live) wire from +12v DC to +5v DC, because the fan will not start to

spin with just 5v DC. The fan needs +12v DC to begin to spin. The user

must verify that the unit operates coolly if the unit is run with slowed

fan speed.

RISKS AND COMPLICATIONS

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1. Follow usual precautions: All computer power OFF when connecting or

disconnecting accessories; also, discharge static before going into the

CPU.

Note though, that when the internal power supply is replaced, you will

need

to discharge static by touching a lamp, metal file cabinet first.

2. Metal objects (paperclips, etc.) may spill into the power supply on

Apple II Computer Technical Information : Apple II Family Hardware Info

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