ENGR201 Lab 2019 Fall
Lab 4
Name: Nic Theobald
Email: nstheobald@fortlewis.edu

Soldering and More Circuits

Introduction: Soldering is used to make mechanical end electrical connections between two parts. Soldering is useful for prototyping PCBs.

Materials:      
9V Power supply 
Multimeter
10k Potentiometer
1k resistor
10k resistor
1 LED
1k Photoresistor
741 Comparator OP-AMP
6-Pin IC Socket
Perfboard
Soldering Iron
Rosin Core Solder
Wire Strippers
Tweezers
Flux
Solder Wick
x1
x1
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x
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x1
x1
x1
x1
x1
x1
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Methods:

All the relevant components were gathered and a schematic was hand-drawn in order to make soldering and component placement more efficient. The following process was followed for the soldering of each component; the component was placed on the board, a small amount flux was added to the joints that will be soldered, the joint was heated up, and the solder wire was touched to the joint. Once all of the components were soldered to the board, a small amount of solder was added to the joints where a jumper wire will be attatched. Jumper wires were then soldered to the relevant components. The circuit was then testsed using the power supply (figure 1). A SMT (surface mount component) resistor was then layed on top of a PCB and a small amount of lux was applied. A small amount of solder was then applied to the resistor (figure 2). A section of solder-wick was then placed on the resistor and the soldering iron was pressed to the solder wick immediately above the resisotor. The wick attracts the solder and the resistor is easily removed from the board (figure 3).

4. Results:

Task 2:

Testing The Circuit
F1 Led luminance changing with the amount of light covering the photoresistor



Task 3:

Surface Mount Soldering:
F2 Soldering resistor to PCB


F3 Desoldering resistor from PCB


5. Discussion: No Notes were Taken During This Lab