Donn Steward CPUville 8-bit Manuel d'instruction - Page 3

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Introduction

Building Tips

Thanks for buying a CPUville kit. Here is what you need to build it:

1. Soldering iron. I strongly recommend a pencil-tip type of iron, from 15 to 30 watts.

2. Solder. Use rosin core solder. Lead-free or lead-containing solders are fine. I have been using

Radio Shack Standard Rosin Core Solder, 60/40, 0.032 in diameter. Use eye protection when

soldering, and be careful, you can get nasty burns even from a 15-watt iron.

3. Tools. You will need needle nose pliers to bend leads. You will need wire cutters to cut leads

after soldering, and possibly wire strippers if you want to solder power wires directly to the

board. I find a small pen knife useful in prying chips or connectors from their sockets. A

voltmeter is useful for testing continuity and voltage polarity. A logic probe is useful for

checking voltages on IC pins while the computer is running, to track down signal connection

problems.

4. De-soldering tool. Hopefully you will not need to remove any parts from the board, but if you

do, some kind of desoldering tool is needed. I use a "Soldapullt", a kind of spring-loaded

syringe that aspirates melted solder quickly. Despite using this, I destroy about half the parts I

try to take off, so it is good to be careful when placing the parts in the first place, so you don't

have to remove them later.

Soldering tips:

1. Before you plug in the iron, clean the tip with something mildly abrasive, like steel wool or a

3M Scotchbrite pad (plain ones, not the ones with soap in them).

2. Let the iron get hot, then tin the tip with lots of solder (let it drip off some). With a fresh coat of

shiny solder the heat transfer is best.

3. Wipe the tinned tip on a wet sponge briefly to get off excess solder. Wipe it from time to time

while soldering, so you don't get a big solder drop on it.

4. All CPUville kits have through-hole parts (no surface-mounted devices). This makes it easy for

even inexperienced hobbyists to be successful.

5. The basic technique of soldering a through-hole lead is as follows:

1. Apply the soldering iron tip so that it heats both the lead and the pad on the circuit board

2. Wait a few seconds (I count to 4), then apply the solder.

3. Apply only the minimum amount of solder to make a small cones around the leads, like this:

1 These are generic building tips that apply to all CPUville kits. The photos may not be from the same kit you have

purchased.