The ParaFET circuit components can be accommodated on a single-side PCB. All the components used in the circuits including the ParaFET, blinking LED and thermometer have been listed in the parts list above. An actual-size, single-side PCB layout of the ParaFET circuit is shown in Fig. 7 and its com¬ponent layout in Fig. S.

Once the components are soldered, the board can be connected to the PC s parallel port.

The 25-pin parallel-port connector should be a female connector mounted on the PCB board. Attach the body of the female connector to the PCB board firmly. Connect it to grofmd line of the circuit through a 3.3-kilo-ohm resistor. PI and P2 shown in the circuit are nothing but the connecting points of the metallic part of connector CONI to the PCB board. A 25-pin FRC cable about 40cm in length with 25-pin parallel-port male connector at both ends can be used to connect the circuit board
and the Pc.


A I4-pTn FRC cable about 20cm in length with I4-pin header (female) at both ends can be used to connect the target board from the JT AG conmcting points. An industry-standard USB ca¬ble is required to connect the PC when extra power is required in the target board. Glowing of LED I indicates that the board is connected to the Pc.

After you have successfully assembled the circuit, however, without invoking the IAR IDE tool and con¬necting a target board to the ParaFET, not much can be tested. The next section will describe building the target board for testing the working of the ParaFET.