Transcript Document

Electronic Project Kit
Grant Ellington
North Carolina State University
Biological &
Agricultural
Engineering
Objectives
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Learn to read and follow an electric schematic
Identify electronic circuit components
Function of circuit components
How to solder correctly
Promote Science and Technology
General Instructions
• Refer to Figure 1 for parts layout and parts list
• Refer to Assembly Instructions step 1-3
• Suggested assembly order;
– Install resistors first (especially if new to soldering)
– Install IC socket (notch down), trimmer resistor (P1) and
LEDs
– Solder 9V snap plus wire to switch and board
– Solder thermistor to wire pair and board
– Install IC Chip (notch down)
Temperature Warning Kit
Top Edge
Front Side
Back Side
Correct Solder Joints
Resistor
Provides resistance to
impede the flow of
current or electrical
charge
Limits the current in
desired components of a
circuit
10 Ohm
22K Ohm
Variable
Resistor Value
1st = numeric value
2nd = numeric value
3rd = multiplier
4th = tolerance
1st band
2nd band
4th band
3rd band
Refer to Resistor Color Code (Kit Instructions Figure 5)
Resistors Positioned Correctly
R1
R2, R3
R4
Integrated Circuit (IC)
Multiple circuit components
processed or contained in
a single substrate or chip
IC Socket
IC Chip
LED (Light Emitting Diode)
Emit light in response to
small voltage
Polarity sensitive;
+ Anode
- Cathode (short leg)
Flat Side
(Notch)
Short Leg (-)
(+)
(-)
Refer to LED Info (Kit Instructions Figure 4)
On-Off Switches
SPST - Single
Pole Single
Throw
SPDT - Single
Pole Double
Throw (3-way)
DPDT - Double
Pole Double
Throw
Push Button
Momentary
Toggle
Switch and 9V Battery Snap
+ (red)
- (black)
Thermistor
Temperature sensing device;
Resistance changes with
temperature
- Negative coefficient type
- Limited range
Thermistor Connection
Heat Shrink Tubing
Solder to board
Additional Resources
• 4-H Electric Curriculum Project Guides
– Entering Electronics
• “Soldering and Troubleshooting Tips” on Electric
Program web page