| 1 |
Course Introduction |
How to connect the power supply
How to read a voltage, resistance, and current with the DMM
Reading resistors
How protoboard is laid out
Each team builds a voltage divider with nom. 3.3 V output, and measure Vout. However, each team works in different resistance regimes (from 100's of Ohms to 100 kOhm)
Each team puts same set of load resistors on their dividers (100's ohms to MOhm)
All teams exchange data and plot results from all teams on one graph in their notebooks - discuss loading of dividers! |
| 2 |
Resistors and Diodes |
LED lamp driver
Driving multiple LEDs in parallel and series
Use potentiometer to limit current and map I-V curve, each team with different color LED (one team with silicon signal diode)
All teams exchange data and plot results from all teams on one graph in their notebooks
Build and test 7805 circuit w/load |
| 3 |
Bridge Circuits |
Build bridge rectifier with LEDs and use the load resister to limit current
See conduction paths light up depending on polarity of AC input
Measure voltage drop across load for both polarities
Measure voltage at each end of load w.r.t. ground of 9V battery for both polarities
Mechanical switch limits speed, so introduce function generator
Find maximum frequency that gives no flicker
Introduce Oscilloscope to view waveforms |
| 4 |
Oscilloscopes and Capacitors |
Review operation of Oscilloscope
Add ripple reduction filter on bridge rectifier from last week |
| 5 |
Filters |
Each team uses unique RC combination for low-pass filter, measures amplitude response at 10-12 frequency
All teams exchange data and plot results from all teams on one graph in their notebooks - discuss different turn-on voltages
Repeat 3) and 4) for high-pass filters |
| 6 |
Relays and Transistors |
Drive motor off of power supply
Build relay driver to toggle LED
Build relay driver to toggle motor
Build NPN transistor switch driving LED and demonstrate
Drive transistor-controlled LED with function generator
Build and demonstrate NPN transistor switch driving motor |
| 7 |
Op-Amps |
Build x2 gain inverting op-amp with potentiometer-based voltage divider as input. Drive a range of loads, compare results to bare divider
Give each team a different op-amp circuit to build, measure, and analyze
Each team presents results and analysis for its circuit to rest of class |
| 8 |
555 Timer Circuit |
Build 555 as one-shot driving an LED
Present internal model and analyze
Build 555 as oscillator driving an LED |
| 9 |
Sensors |
Measure resistance of CdS cells under low and high levels of light
Use results to select a fixed resistor, use that resistor and CdS cell to make voltage divider circuit to detect light
Use comparator to drive LED
Voltage divider (potentiometer) as input to comparator-driven LED
CdS cell divider as input
Light-activated motor
Add RC filter to get transient motor drive when light turns on (or off) |