DIY PICmicro K149 Manuel - Page 3

Parcourez en ligne ou téléchargez le pdf Manuel pour {nom_de_la_catégorie} DIY PICmicro K149. DIY PICmicro K149 16 pages. Usb programmer

Starting

The first thing to do is inspect the PCB for shorted or open tracks or other

damage. Be aware of the static warning when doing this check. When you are

satisfied that all is well, then you can proceed.

Start with the flattest parts first, which are the resistors. Hold each resistor body

by the thumb and forefinger and use your other hand to loosely bend both of the

leads over at right angles at the same time. Try not to make the bends too sharp,

and you will find that they slide straight into the mounting holes on the board.

Leave the pigtails on each of the components until after soldering as the extra

lead length serves as a heat sink for the component. Try not to leave the

soldering iron on the components too long or you risk damaging them. The usual

method is to hold the iron tip so that it touches the component lead and the PCB

pad at the same time, and then apply a small dab of solder. This operation

should only take about a second or two. If you are unsure of your soldering

ability, find some spare components and practice on these before building the

programmer board.

Check that each solder joint is bright and shiny and doesn't look like a big dull

blob which could mean a dry solder joint. The solder should flow freely onto the

component lead and solder pad if it is to be a good joint.

After the resistors are soldered in, recheck your work and then mount the diodes

D1, D2 and D3

Next, if supplied, mount the IC socket for the PIC16F628 chip.

Now you can mount the box poly (MKT) capacitors. Most of these look the same,

so check the values and make sure they are inserted into the correct positions.

Then solder the four 22p ceramic capacitors.

Next, mount all the electrolytic capacitors. These are polarity sensitive

components so make sure they are mounted properly. The positive lead is longer

than the negative lead, and the negative lead is also marked on the side of the

capacitor. On the PCB overlay, there are holes marked [+] as the positive lead

for each of these components.

There are 4 LEDs that can be mounted next. Make sure they

are oriented correctly. The Anode is marked on the PCB and

is the longer of the two leads on the component. The

Cathode has a flat surface on the LED body and is also

marked on the board.