DIY PICmicro K149 Podręcznik - Strona 4

Przeglądaj online lub pobierz pdf Podręcznik dla Płyta główna DIY PICmicro K149. DIY PICmicro K149 16 stron. Usb programmer

There are five transistors supplied. Four of them are PNP type BC558, and one

is an NPN BC547. Do not mix them up and mount them as shown on the PCB

overlay.

Now solder the 9 pin RS232 socket, the USB socket and the power jack on to

the board followed by the 7805 and 78L08 regulators, again carefully checking

orientation.

The next parts to mount are the 2 crystals. One is a 4MHz type and the other is a

6MHz so don't get them mixed up.

You can now mount the DPDT switch and the ZIF socket.

There is 1 wire link that needs to be fitted to the board. DO NOT insert it at this

stage.

The last things to fit to the board are the rubber feet. These stick to the

underside of the PCB, one in each corner.

Now you should go over all of your work and inspect for dry or unsoldered joints

and check all components for correct orientation and placement.

If you are satisfied that all is well, then you will need an 18VDC power supply to

test the board. Positive should be on the inner connection of the power jack as

shown on the PCB overlay.

Connect the power and observe that

the power LED (L4) lights. If not,

turn off the power immediately and

check the orientation of diode D2 nd

the power wiring. Re-check the PCB

for any other mistakes.

Turn the power back off if the LED

did light up. Make sure you have a

multimeter ready for use and set it to

measure 5 volts DC. Turn the PCB

back on and measure the voltage

between a test pads marked on the

PCB (+5V) and (Gnd) near the

RS232 socket.

The meter should read close to 5 volts. If not, turn off the power immediately and

check that the regulators are inserted properly.