ECE 320 / 321 Electronics
Best of ECE 320/321: Electronics
ECE 320: Digital Electronics
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Electronically Turning On and Off a Fan
Spring 2018 A Schmitt Trigger along with a transistor switch is used to turn on and off a DC motor. If you replace the resistor with a light sensor or temperature sensor, this circuit can turn on and off a fan based upon light level or temperature. |
ECE 321: Analog Electronics
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Bass Boost
Spring 2015 The audio signal from a computer (or cell phone) is amplified and filtered to create a subwoofer. A 3rd-order Butterworth filter is used to pass frequencies below 250Hz. An amplifier boosts the voltages. A push-pull amplifier then drives a 4 inch speaker. |
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Frequency Thermometer
Fall 2020 A 555 timer along with a thermistor is used to create a temperature-controlled oscillator. By recording the frequency using a cell phone app, the temperature of various objects can be determined. |
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Electronic Candle
Fall 2018 An electronic circuit is built to simulate a flickering candle with an LED. A random noise generator (from a cell phone app) is mixed with a sinewave. The resulting signal drives an LED through a push-pull amplifier with a current output. |
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Sound on a Laser Beam
Fall 2018 An audio signal is transmitted 10 feet across the room using a laser diode and amplitude modulation. On the receive side, a 4th-order Butterworth low-pass filter passes frequencies below 300Hz and then a push-pull amplifier drives an 8-ohm speaker. |
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yPlaying Jungle Bells over a Light Beam
Fall 2018 An audio signal is transmitted over a light beam using amplitude modulation. A LDR sensor picks up the light sensor, which is then low-pass filtered with a 5th-order Chebychev low-pass filter. A push-pull amplifier then drives an 8 Ohm speaker. |
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4th Order Butterworth LPF / Bass Boost
Fall 2018 A signal from a cell phone is amplified, passed through a 4th-order Butterworth low-pass filter, then amplified with a push-pull amplifier to drive a speaker. When played alone, deep bass is passed to the speaker. When a smaller speaker plays the raw signal, you can hear the song along with some head-banging bass. |
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Sound on a Light Beam
Fall 2018 An audio signal is transmitted using amplitude modulation on a light beam (white LED). A light sensor picks up the light beam, which is amplified and sent to a push-pull amplifier. |
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