footprint pcb

Input Data

Schematic diagram with component detail, interconnections, edge connector specification (refer to Appendix A-3 to A-6).

Component list

Figure A-7 Component List

Component code Value DescriptionFootprint Code (PROTEL)

POWER SUPPLY

BRIDGE1 IN 4001 Diode DIODE0.4

R1 100 Resistor 1/4W AXIAL0.4

Z1 12V Zener DIODE0.4

C1 220UF/16V E Capacitor AXIAL0.4

C2 O.1UF E Capacitor RB.2/.4

R2 33K Resistor 1/4W AXIAL0.4

Q1 9013 Transistor T0-92A

C3 1000UF/16V E Capacitor RB.2/.4



TRANSMITTOR

BATTERY 12V Battery AXIAL1.0

SW1 Dip-switch RAD0.2

SW2 Dip-switch RAD0.2

D1 IN 4148 Diode DIODE0.4


D3 IN4148 Diode DIODE0.4



SW3 DIP-8 Dip-switch DIP8

U1 PT-2262 IC DIP18

R4 33M Resistor 1/4W AXIAL0.4

LED1 RED LED LED 3mm RB.2/.4


L2 10UH Coil AXIAL0.4

VC1 25P Variable Capacitor AXIAL0.4

C5 3P Ceramic Capacitor AXIAL0.4


Q2 MPSH10 Transistor T0-92A


RECEIVER-UHF

L3 1 TURN Coil AXIAL0.4

VC2 5P Variable Capacitor AXIAL0.4






Q3 MPSH10 Transistor T0-92A


C9 100n Ceramic Capacitor AXIAL0.4

L4 8Turns Coil AXIAL0.4

R8 2.7K Resistor 1/4W AXIAL0.4













U2 MC4558 IC DIP8

R16 6.2M Resistor 1/4W AXIAL0.4



RECEIVER-DECODER

SW4 DIP-8 Dip-switch DIP8

U3 PT-2272 IC DIP18




U4 MC14013 IC DIP14



LED2 RED LED LED 5mm RB.2/.4



RELAY1 12V Relay SIP8

CON1 2-PIN Socket SIP2


RELAY2 12V Relay SIP8



C14 47UF/16V E Capacitor AXIAL0.4

mechanical specifications such as board size and shape, mounting holes, identification of restricted areas with respect to component height, edge connector

PCB specifications, using single- and double-sided.

Photo Plotting

In the photo plotter, the input data are converted back to graphics by photographic (Refer to Appendix A-7 to A-9).

PCB Fabrication Process

Step 1 Clean the blank PCB. The first step is probably the most important. Step 2 Apply the Photoresist. While liquid photoresist can be applied by spraying, dipping, speed whirling, and roller coating, these methods are used primarily for mass-production in industry. When the liquid photoresist is first applied, it really is not yet a resist, but a sensitizer. To take on the properties of a resist that will protect copper underneath, it must be dried and exposed to ultraviolet light. Step 3 Dry the Photoresist and leave the board in a dark cabinet overnight to let it dry. Step 4 Expose the Sensitized PCB to Ultraviolet Light. If the board were now placed under an ultraviolet light, the entire sensitized surface would turn to a resist, and no copper could be etched away. Using an ultra-violet black light, set the printing frame so that it is directly facing the light, approximately 1 foot away. Be sure the surface is exposed to ultraviolet light and that the lamp holder does not cast shadows. Expose for a minimum of 2 minutes. When the exposure is complete, remote the PCB from the frame. The sensitized areas exposed to ultra-violet light are now hard and have formed into a resist. Step 5 Develop the Image (Pattern). The purpose of the developing step is to remove the unwanted remaining sensitized material (where there was no ultraviolet exposure) and bring out the latent image of the traces and pads. While still under safe-light condition, place the board in a tray filled to a depth of ½ inch with developer. Cover the tray to avoid breathing harmful fumes, and rock the tray gently for about 20 minutes. Then, remove the board and let it drain. At this time return to normal lighting conditions. An image of the traces and pads should now be standing out in clear relief from the surrounding copper. Steps 6 Rinse and Dry. Under cool, slow running water, rinse the board for 2 t0 3 minutes. Do not let the water hit the board directly, since it could smear the resist pattern. Step 7 Of all the processes involved in making a PCB, the etching procedure is probably the easiest. Fill the etching container with acid to a depth that will cover the submerged PCB. Ideally, the board should be standing on edge. But if it must lie horizontally, be sure the copper side is facing up. Don't plunge the board into the acid; place it in the container.

Step 8 Using water to cleaning the Acid.

footprint pcb

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