EENG 393

In Lab 9 - Board review

Requirements

Review three designs, assigned to you in class, using the file boardReview.docx. After reviewing a design, upload the completed word document to that person's Google Drive folder.

Objective

Critically examine a PCB layout and provide feedback. Utilize feedback on your layout to improve the design.

Parts review

Please generate a bill of materials using the schematic and check it off against the following table. The following table and schematic (scroll down) should resolve any questions that you may have about what footprint to use. You can also look through your bag of parts to see what parts have been provided.

Qty	Value	Device	Package	Parts	Description
9		LEDCHIPLED_1206	CHIPLED_1206	LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8, LED9	LED
2		SWITCH-DPDT-SMD-AYZ0202	SWITCH_DPDT_SMD_AYZ0202	S1, S2	Double-Pole, Double-Throw (DPDT) Switch
1	100SP1	100SP1	100SP1	SW1
4	10k	R-US_R1206	R1206	R12, R13, R15, R20	RESISTOR, American symbol
2	10n	C-USC1206	C1206	C4, C5	CAPACITOR, American symbol
3	10u	CPOL-USB	PANASONIC_B	C1, C2, C3	POLARIZED CAPACITOR, American symbol
22	1k	R-US_R1206	R1206	R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R16, R17, R18, R19, R21, R22, R23, R24, R25, R26, R27	RESISTOR, American symbol
1	1Ω	R-US_0411/15	0411/15	R14	RESISTOR, American symbol
2	2.2U	C-USC1206	C1206	C6, C7	CAPACITOR, American symbol
1	2N2222	TRANS_NPN-MMBT2222AL	SOT23-3	Q1	NPN transistor
1	68	R-US_R1206	R1206	R28	RESISTOR, American symbol
1	GND	JP1E	JP1	JP1	JUMPER
2	LM324D	LM324D	SO14	IC1, IC2	Quad Op Amp 2.7V to 6.0V Single Supply CMOS
1	LM334Z	LM334Z	TO92	IC4	3-Terminal Adjustable Current Sources
1	LP2983IM5-1.0/NOPB	LP2983IM5-1.0/NOPB	MF05A	U2
1	LP2985-10DBVR	LP2985-10DBVR	DBV5	U1
1	LT3080	LT3080	TO-220-5R	REG1
1	MFKDSP	MFKDSP	MFKDSP	JACK1
3	MOUNT-HOLE2.8	MOUNT-HOLE2.8	2,8	H1, H2, H3	MOUNTING HOLE with drill center marker
1		JACK-PLUG0	SPC4077	J2	DC POWER JACK
2	EVUF2A	EVUF2A	EVUF	R30,R31	9mm Sqaure Rotary Potentiometers
1	SK104-PAD	SK104-PAD	SK104-PAD	KK1	HEATSINK manufacturer Fischer/distributor Buerklin
1	TLC274D	TLC274D	SO14	IC3	OP AMP
4	TPPAD1-13	TPPAD1-13	P1-13	TP1, TP2, TP3, TP4	Test pad

Net review

There are a variety of methods that you can employ to help ensure that your layout will be correct. One of these is a net-by-net review of the schematic and layout. The goal is to insure that every signal you placed on the schematic, to connect components, is connecting the corresponding components in the layout.

Perform a net-by-net review of your design for next week. This will require a computer running EAGLE CAD, a paper copy of your schematic, a pencil and highlighter. Perform the following steps to get ready for this process.

• Launch EAGLE CAD,
• Open your project,
• Open the schematic and layout side-by-side so that they occupy the entire screen,
• In both the schematic and layout, click Zoom to fit, the magnifying glass with a black rectangle,
• In the schematic, select the information tool,
• Click on a part,
• The Properties pop-up for that part is highlighted in the layout,
• Click Ok to remove the Properties pop-up,
• In the schematic click on the Name tool,
• In the schematic click on a wire,
• The Name pop-up for the wire (showing its name) is highlighted in the layout,
• Click OK to remove the Name pop-up.

Remember that a net is a named interconnection of electrical devices. A net is a logical circuit element, meaning that we use it as a place-holder for something real. When you "route a net", you transform the logical net connections into physical connections with wires. In any first generation design, it is a good idea to verify that the each net is routed correctly. In other words, verify that the physical wires corresponding to the net connected to all the intended devices.

To do perform the following set of steps for each net in the schematic.

• Select it using the Name tool,
• Write the net's name on its wire in the schematic,
• If the net has a defined name, then place a check next to the given name,
• For each device that the net (in the schematic) connects to:
  • Verify that it is connected in the layout,
  • Highlight the schematic pin corresponding to this connection.
• Repeat for all the nets in the schematic.