PS 141 (CS) - Electronics for Computer Science Sophomores

PS 141 for Computer Science

Nov

Dec

Jan

Feb

Mar

Who are the 1's & the 0's anyway?	"page down" please
Let us make the 1's & the 0's dance!
Now we can count in DEC, BIN & HEX . . .
Yes our hardware counts to any number!
Can we build a digital clock? Of course!
. . with alarm function? Yes to that too!
h o l i d a y b r e a k -- yehey!
. . that can sing? Like a bird? Yes!
. . that the computer controls? High-Tech, eh?
Now for the Enjoyment . . . !

teach ELECTRONICS to your 12-year old brother or MOM!
*** great teachers!!! click on their names BELOW ***

B4 April Rey and Mark Lihan (*** highly recommended - click here ***)


	PS 141 - Section A A2 Antonio Maria R Bautista (pdf) A2 Maria Esperanza Fatima F Ortile (pdf) A4 Jan Benedick Asturias (pdf) A4 Kendrick Timothy Huang (pdf) A5 Perry Pe (pdf) A5 Jarell Mallari (pdf)	A6 John Philip Posadas (pdf) A6 Kimberly Ong (pdf) A7 Randolph Espinosa (pdf) A7 John Hardey Loang (pdf) A8 Vanessa Gonzales (pdf) A8 Kenneth Flores (pdf)


	PS 141 - Section B B2 Esmee Siy (pdf) B2 Celilia Hung (pdf) B3 Mia Montayre (html) B3 Jairus Aragon (html) B4 April Rey (*** highly recommended *) B4 Mark Lihan (* highly recommended ***)	B5 Adrian Rodriguez (html) B6 Enrique Perez (pdf) B6 Ramon Mejia (pdf) B7 Ryan Pachayasatierkul (html) B8 Jun Danganan (pdf) B8 Ramon Caguion (pdf)

	PS 141 (CS) Electronics for Computer Science Sophomores
	t h calasanz

past years' (sy2001-2) - PS 141 Site Structure
last years' (sy2001-2) - Course Block Diagram

           - class syllabus
           - laboratory report on learning elements

           - Notes on Class Pedagogy

- LABORATORY ACTIVITIES OF STUDENTS

home ps141 entry top 1 2 3 4 5 6 7

1 - who are 1's and 0's anyway?
laboratory report on learning elements

home ps141 entry top 1 2 3 4 5 6 7

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
laboratory report on learning elements
( 7442 / 7490 / 7493 / 74193 / 7442 / 7447 )

home ps141 entry top 1 2 3 4 5 6 7

counting - hardware style

decimal "1" to "10"

binary "0" to "1111"

hexadecimal "0" to "F"

3 - making decisions (logic gates / selectors / multiplexer / demultiplexer)
laboratory report on learning elements

home ps141 entry top 1 2 3 4 5 6 7

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

check the existence of two or more 0's with a 2-input OR gate
___gif image___
___pdf version___

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
___gif image___

___pdf version___

want to build a digital clock?

Yes, a digital alarm function!

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

4 - analog switches (diodes / transistors / operational amplifiers)
laboratory report on learning elements

home ps141 entry top 1 2 3 4 5 6 7

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
3. (FOR LATER) operational amplifiers as switches

5 - op-amp analog applications
laboratory report on learning elements

home ps141 entry top 1 2 3 4 5 6 7

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
laboratory report on learning elements

home ps141 entry top 1 2 3 4 5 6 7

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.

7 - allocated for specific interests
laboratory report on learning elements

home ps141 entry top 1 2 3 4 5 6 7

did you know you could build a digital voltmeter without using computers or microprocessors? you could use only TTL and analog devices using the so-called "successive approximation" method