PS 140 (CS) - Electronics for Computer Science Sophomores

to my PS140 students:

Mr Toto Oppus and I greatly enjoyed the presentations you made of
your projects on March 8, 2006!!!

You might even want to continue the projects onward to your theses.

Tristan H. Calasanz

Welcome to the PS 140 (ay 2005-6) homepage.

The students decided to pursue two different projects (wed & fri groups).
Click the links below to appreciate their work.

Wednesday Group of Students
Friday Group of Students

Final presentation is scheduled for 08 march 2006.

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	PS 140 (CS) Electronics for Computer Science Sophomores
	t h calasanz c m oppus

School Year 2001-2 - PS 141 Site Structure
School Year 2001-2 - Course Block Diagram

           - class syllabus

           - NOTES ON CLASS PEDAGOGY

           - SPECIAL INTEREST PROJECTS and NAMES OF STUDENTS

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1 - who are 1's and 0's anyway?

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highs are "1's", lows are "0's"
"1's" are between 2.4 and 5.0 volts and
"0's" are between 0 and 0.8 volt

visually telling one from another / further detailed explanation

making "1's" and "0's" run / further detailed explanation

2 - counting up and down

( christmas lights with 7442 / 7490 / 7493 / 74193 / 7442 / 7447 )

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counting - hardware style

decimal "1" to "10"

binary "0" to "1111"

hexadecimal "0" to "F"

3 - making decisions (logic gates / selectors / multiplexer / demultiplexer)

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check the existence of two or more 1's with a 2-input NAND gate
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___pdf version___

check the existence of two or more 0's with a 2-input OR gate
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detect the existence of any condition or combination of 1's and 0's
a) build this circuit
b) implement a reset at the counting circuit at 0110

a solid-state router
a) build a circuit that will send the input to a point "A" when the selector pin is at "0", and send it to point "B" when this selector pin is at "1".
b) send the output of a 7490 counter to a 7442 when the selector pin is at "0" and to a 7447 when the selector pin is at "1"

count up to any number and back (count up OR down)
a) build 74193 in parallel with 7490
b) get 7442 input from 74193 or 7490
c) run 74193 in up and down mode using your 7442 circuit to display count
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___pdf version___

want to build a digital clock?

want to use the power line as a time-base?

4 - analog switches (diodes / transistors / operational amplifiers)

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ON/OFF switches, AND / NAND / OR / NOR gates
1. use diodes to switch LED at 7442 to implement combinational switching
2. use transistors to switch high powered loads

5 - op-amp analog applications

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basics of an operational amplifier.

Exercise 5. Build an OpAmp circuit to comply with the specifications below.

Power supply : +12 volts, -12 volts, GND (0 volt).

Connections according to the circuit above.

R(f) + R(i) = 500K. Use a 500K potentiometer to perform the role of a volume control.

Generate a "sine wave" using a "Signal Generator" and introduce 50-millivolts between the NInv (connected to GND) and Inv.

Connect "Channel A" of the oscilloscope to the Inv input and "Channel B" to the "output" of the OpAmp.

Manipulate the "volume control" and watch the behavior of signals shown in channel A and channel B.

6 - transistor analog applications

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basics of transistors.

Exercise 6.

Construct the circuit in Figure 6-3 in "Transistor Basics" (given below).

Connect the input of the speaker circuit below, through a 100 microfarad capacitor, to the output of Figure 6-3 of Transistor Basics.

Connect the input of Figure 6-3 in that circuit to the output of Figure 5-2 of OpAmp Basics (also given below).

CAUTION. Bring the volume control of Step 3 (Exercise 5) to its lowest setting before undertaking the next step, below.

Follow Step 4, Step 5, and Step 6 of Exercise 5.