Caple C871i Manual de usuario descargar pdf (Pagina 560)

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Apple II Computer Info

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### FILE : voltage

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### Created : Sunday, January 14, 1996 Modified: Sunday, January 14, 1996

### File Type: "TEXT" File Creator: "LMAN"

### File Size: 4890 bytes 4 KB

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Newsgroups: comp.sys.apple2

Path:

news.weeg.uiowa.edu!news.uiowa.edu!uunet!orca!javelin.sim.es.com!animal!mmunson

From: [email protected] (Mark Munson)

Subject: Re: 5v to 5.25v

Message-ID: <[email protected]>

Sender: [email protected]

Nntp-Posting-Host: animal.sim.es.com

Reply-To: [email protected] (Mark Munson)

Organization: Evans & Sutherland Computer Corp., Salt Lake City, UT

References: <[email protected]>

Date: Thu, 1 Oct 1992 23:13:51 GMT

Lines: 94

Frank:

You're power supply won't give you 5.25 Volts directly. It only

supplies +/- 5 Volts and +/- 12 Volts. So you've have to get the

5.25 Volts that you want from the 12 Volt line.

First off, you've have to remove the current 5 V line to the

CPU by cutting a trace on the accelerator card. The new

power supply will be connected to the line where you just

cut it, supplying the chip with power from your new source.

If I recall correctly, the ZipGS (9 MHz) came with some circuitry built

in to boost the voltage up. 7 MHz ZipGS cards don't have the components,

but the circuit board shows where a transistor and a few resistors could

go. If you have a 7 MHz zip card, find someone with a 9+ MHz version and

add the components that they have on thier board and you don't have on yours.

On a TWGS, you must add the extra circuitry yourself. This can be done by

building a small breadboard with the compnents attached.

A sample circuit to get a variable voltage supply might look like the

following:

12 V 12 V 12 V = +12 Volt line (available from BUS

line)

| | T = NPN type Transistor (2N2222)

| | R1 = Resistor ( ~ 100 Kilo-Ohm )

R1 R3 R2 = Micro miniature pot (variabl

| | (resistor 100 K Ohm)

| ___C--- R3 & R4 = Resistor ( ~ 10 Kilo-Ohm )

--> R2 --B( T ) B = Transistor Base lead

| ---E [output] C = Transistor Collector lead

| ---+---- 0 - ~5.3 Volts E = Transistor Emitter lead

| |

| R4

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 560 of 572

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Caple C871i Manual de usuario Pagina 560

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