ADDENDUM TO TRONIX BOOK 2 Version 2.0

(Green Cover with Red Stripe)

NOTE: BEFORE YOU START THIS WORKBOOK, MARK THESE CORRECTIONS IN YOUR TRONIX 2 BOOK.

Page 2b - a very important correction is necessary in the Truth Table for the ‘AND’ gate in column 1 of this page. It should read, from top to bottom, 000,010, 100,111. Also, in column 2 there is a font error in the middle of column 2 where it says, “Note: The dot (there is a funny Y with two lines through it. It should be a dot like this. •

Page 3b - in column 2 under the sub-title EXPERIMENT, the last sentence in Part 2 should read “Fill-in Q as a ‘1’ on Line 4 (not Line 1) of the Truth Table on the right.

Page 7b, the formula at the top of the right hand column should have a dot to indicate multiply between the R1 and the C1.

Page 14a - in the box labeled ‘Pinout of the Seven-Segment Display’ the Y’s with the lines through them should not appear in the diagram. They were meant to be dots like this •.

Page 18b - in the second column there is a diagram of the chip and a Table of Inputs and outputs. It says “Multiplexer” but it should say “The Demultiplexer and its Output Switches Table”.

Page 19a - Please note that this particular experiment requires a 9 volt alkaline battery to make it work correctly because it draws a lot of current from the battery. (Also, at one time we sent some 4051 chips made by HEF. This particular brand of IC will not work in this experiment. If you have these, please ask us for replacements.)

Also, there is an error on the pictorial diagram of 19a. R6 is shown plugged into the negative bus but it should be plugged into the positive bus line. The schematic is correct.

Page 20b - In the first column, under 555 TIMER IC, the last sentence should read, “will alternate if there is a pulse.”

Page 22a, on the circuit board PICTORIAL DIAGRAM the + and – signs in the lower left hand corners need to come up like on the right hand lower corner. Also, be sure to use NE555 for this experiment. For some reason, other 555s do not work.

Page 23b, the first paragraph after CIRCUIT DESCRIPTION is incorrect and should be crossed out. The actual reason that it is 50/50 is because the output of pin 6 on the 4029 turns on and off every other pulse, thus 50-50 chance you will have the LED lit up.

Page 27a, there is a label of 560 ohms along the lower edge of the Solderless circuit board that does not refer to any part and does not need to be there.

Page 27b, in the paragraph under 4029 COUNTER the last word is Demultiplexer and it should be BINARY COUNTER instead.

Page 28b, on the third column, which is the INVENTORY of parts, it shows a Pushbutton Switch near the bottom, this should really be a picture of a Potentiometer.

Page 29b, in the first column, under the heading 555 TIMER CHIP AS A ‘CLOCK’, there are some funny characters on either end of the work CLOCK. They were supposed to be single quote marks but the computer program changed the font on us.

Page 30a, there is an extra wire on the schematic connecting Pin 1 of the 4029 to Pin 6 on the 4511. This wire should not be there.

Page 33a and 33b. Two things are wrong.

(1) The correct spelling of Schmitt is with two of the letter T, not DT.

(2) Also, more important, the output of the Schmitt Trigger should be into an IC like the 4011 and not to an LED as we did. Wire a 4011 IC up so that both inputs on one of the gates is connected to Pin 3 on the 4093 and the output of the 4011 is connected to an LED and a resistor with the cathode of the LED toward ground.

This way when there is a ‘HI’ on the output of the 4093 the LED will light up and when there is a ‘LO’ it will not be lit. Now when you measure the voltage at which it ‘snaps’ to ‘HI’ and the voltage at which it ‘snaps’ to ‘LO’ they will be right.

The ‘snap’ voltages we show are for exactly 9 volts. Measure the battery voltage and use the formula (9 volts divided by 4.72 volts) = (your battery voltage divided by X). Solve for X and that will be the ‘snap’ voltage on the way up from zero to nine.

The ‘snap’ voltage on the way down from nine volts to zero volts is found by the formula (9 volts divided by 3.87 volts) = (your battery voltage divided by X). Solve for X.

If you notice any other changes that need to be made, please contact me at: Gary Gibson, Gibson Tech Ed, 1-800-422-1100 or email gary@gssteched.com