Bill of Materials:

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Bill of Materials:
Modern Logic Probe
PART NO. 2222272
Modern Logic Probe was designed to measure 0´s and 1´s logics and for working with a voltage from 5V to 12VDC. This project was
based in an LM358 and a common cathode RG LED to its monitorial. The Modern Logic Probe is capable of being adjusted to 0V with
help of a couple of trimmers of 5K for turning off the RG LED. Using the project, the result is a RED led turns on when a ´zero logic´ is
applied or a Green LED turns on when a ´one logic´ is applied. For more information about this project, go to the following websites:
http://www.instructables.com/id/Modern-Logic-Probe/
Time required: 3 hours depending on experience
Experience Level: Beginner
Required tools and parts:
Soldering Iron & Solder Roll
Wire Cutter & Stripper
Rotary Drill & Drill bits of 3/16" & 1/4"
1 Hex nut of 4mm
#22 Wire, 2meters
Plastic Color Tape
Bill of Materials:
Qty
Jameco SKU
Component Name
1
23966
OP Amp Dual General Purpose ±16 Volt32 Volt 8-Pin MDIP Rail
It´s the main component of this project.
1
112206
Socket IC 08 Pin Dual Wipe Solder tail Low Profile 0.30 Inch Width
An important component for this project
1
18922
Case ABS Speedy 3.125x2x.875
A vital component for this project
1
105100
Prototype Builder 1.6" X2.7" PCB Epoxy Glass 0.062" Thick 0.1" Hole Spacing 0.08" Pad Size
It´s imperative that this component be utilized in the project.
1
2185483
Alligator Clip Test Leads - 2 Pack Red and Black
An indispensable component for this project
1
77738
Test Leads with Alligator Screw On Tips 1 Red 1 Black 40 Inch
A necessary component for this project
2
43078
1/2 Watt 3/8" Square Trimming Potentiometer 5k Ohm
It´s imperative that this component be utilized in the project.
1
2125181
5mm Water Clear RGB LED - Common Ground
An indispensable component for this project
1
14277
Led Mounting Hardware T1-3/4 Clear Standard
A necessary component for this project
1
35991
400 VOLT 1 AMP DO-41 SILICON RECTIFIER DIODE400 VOLT 1 AMP DO-41 SILICON RECTIFIER DIODE
It´s necessary that this component be utilized in the project.
1
691121
Resistor Carbon Film 12k Ohm 1/4 Watt 5% (Bag of 100)
An important component for this project
2
690646
Resistor Carbon Film 120 Ohm 1/4 Watt 5% (In Bags of 10 and 100)
A vital component for this project
1
690961
Resistor Carbon Film 2.7k Ohm 1/4 Watt 5% (In Bags of 10 and 100)
An important component for this project
1
691690
Resistor Carbon Film 3.3m Ohm 1/4 Watt 5% (Bag of 100)
Indispensable component for this project
1
419127
HEAT SHRINK TUBING,FIT-221B-1/16-BLACK,4 FEET,BLACK POLYOLEFIN
An important component for this project
Step 1 - List of Materials
1
1
1
1
1
1
2
1
1
1
1
2
1
1
1
LM358N
Socket IC 08 Pin Dual Wipe Solder tail Low Profile 0.30 Inch Width
Case ABS Speedy 3.125x2x.875
Prototype Builder 1.6" X2.7" PCB Epoxy Glass 0.062" Thick 0.1" Hole
Spacing 0.08" Pad Size
Alligator Clip Test Leads - 2 Pack Red and Black
Test Leads with Alligator Screw On Tips 1 Red 1 Black 40 Inch
1/2 Watt 3/8" Square Trimming Potentiometer 5k Ohm
5mm Water Clear RGB LED - Common Ground
Led Mounting Hardware T1-3/4 Clear Standard
400 VOLT 1 AMP DO-41 SILICON RECTIFIER DIODE (1N4004)
Resistor Carbon Film 12K Ohm 1/4 Watt 5% (Bag of 100)
Resistor Carbon Film 120 Ohm 1/4 Watt 5% (In Bags of 10 and 100
Resistor Carbon Film 2.7K Ohm 1/4 Watt 5% (In Bags of 10 and 100)
Resistor Carbon Film 3.3M Ohm 1/4 Watt 5% (Bag of 100)
HEAT SHRINK TUBING, FIT-221B-1/16-BLACK, 4 FEET, BLACK POLYOLEFIN
Step 2 - Diagram 1
In this diagram 1, you can see a LED lit and its light is red because a 'zero' logic is being applied in the point of probe (connected to
pins: 3 & 6) of your project. Also note that the LED is a type of common ground connection, so you can simply connect to their respective
resistors so that you can monitor the result either 'zero' or 'one'. According to the project, you will connect pin 4 & diode's positive
terminal to GND & positive terminal of this project (alligator clips black & red) respectively while diode's negative terminal to pin 8 from
LM358.
Step 3 - Diagram 2
In this diagram 2, you can see a LED lit and its light is green because a 'one' logic is being applied in the point of probe (connected to
pins: 3 & 6) of your project. Also note that the LED is a type of common ground connection, so you can simply connect to their respective
resistors (checking colors green and red to pins 1 & 7 respectively) so that you can monitor the result either 'zero' or 'one'. According to
the project, you will connect pin 4 & diode's positive terminal to GND & positive terminal of this project (alligator clips black & red)
respectively while diode's negative terminal to pin 8 from LM358. You will besides connect to pins: 3 & 6 a resistor of 3.3 M Ohms while
its terminal remaining to a resistor of 12K and trimmer of 5K. Then you should connect the terminal remaining of 12K resistor to diode's
positive terminal and 2.7K resistor while the terminal remaining of 2.7K to the other trimmer of 5K. Now, observe that the middle terminal
of each trimmer of 5K should be connected to the pins: 1 & 5 where the first has connected a resistor of 2.7K while the second has both
a resistor of 12K and other of 3.3MOhms, and without forgetting that you should connect both terminal remaining of the two trimmer of
5K to GND.
Step 4 - Point of Probe 1
For making a point of probe, take a test lead of those included in
your kit then use and adjust it using a hex nut of 4mm held from
outside of the project's box. For doing this proceeding, follow the next steps:
Point of probe 2
Point of probe 3
Point of probe 4
Point of probe 5
Step 5 - Point of Probe 2
Using a wire cutter for breaking literally the plastic area of your
test lead so like in the photo, take a test lead included in your
kit for carrying out the proceeding.
Step 6 - Point of Probe 3
Now, let's pull down the long plastic part of your test lead only.
That is, leave it like it looks in the photo.
Step 7 - Point of Probe 4
After carrying out the step #6, use a soldering iron and a wire cutter
to remove the rest of the plastic on your test lead. Once the test lead is
clean, cut the wire at a short length: for instance, one or a couple of inches.
Step 8 - Point of Probe 5
Once you cut the wire and without plastic insulation in your prospective
point of probe, you will also need a hex nut of 4mm.
Step 9 - Enclosure 1
Taking the ABS plastic enclosure, drill a hole by using a drill bit of
3/16" for manipulating the rotary drill as many as necessary until
you can insert the point of probe perfectly.
Step 10 - Enclosure 2
Now, install the point of probe in your enclosure by using the hex
nut of 4mm to adjust it from outside of the box.
Step 11 - Enclosure 3
In the part of the plastic enclosure showed in the photo, drill a hole
by using a drill bit of 1/4" to install the LED socket later.
Step 12 - Enclosure 4
Now, install the LED socket.
Step 13 - Enclosure 5
In this step, you are going to use heat shrink tubing in the
point of probe terminal. Look the next photo:
Step 14 - RGB LED to RG LED
So that the RGB LED becomes a RG LED, it's necessary to
cut the blue terminal of the RGB LED.
Step 15 - Enclosure 6
Once installed the LED socket, insert the RG LED prepared in the
previous step. In this step, you can use heat shrink tubing of 1/16"
like insulation in LED terminals too.
Step 16 - Alligator Clips
To prepare the alligator clips, you can use Alligator clip test leads:
2-pc one red and one black. With these alligator clips in your hands,
you should cut them either in two parts or 3/4 of wire for using
according to your convenience.
Step 17 - Enclosure 7
Now, take your ABS plastic enclosure and do a hole by using
drill bit of 3/16" in the opposite side of the other hole where you installed
the point of probe.
Step 18 - Enclosure 8
In the hole done previously, install the alligator clips: red & black by
passing the wires through the hole by doing a knot for supporting them
inside of the enclosure.
Step 19 - Installing Components 1
Taking the PCB, install the two trimmers of
5K and the IC socket of 8 pins.
Step 20 - Installing Components 2
In this step, install the resistors of 12K, 2.7K, 3.3M
Ohms and the diode 1N4004.
Step 21 - Installing Components 3
For doing connections to the trimmers of 5K, I'm using green, brown
and white wire. Note that you should check the project's diagram
constantly to avoid errors.
Step 22- Installing Components 4
Now, install the two resistors of 120 Ohms.
Step 23 - Drawing the Wires for Doing Connections 1
Complete the connections to GND and draw a red and other green wire
from the resistors of 120 Ohms to be connected to the red & green LED
terminal respectively.
Step 24 - Drawing the Wires for Doing Connections 2
Now, draw a black wire for being connected to the common ground
of your LED installed previously, and you should also draw a yellow
wire between the pins: 3 & 6 from the IC socket to be connected
later to the point of probe. Finally, draw a couple of wires from the
positive and negative terminal of this kit so that you can use them like
connection to red and black alligator clips respectively.
Step 25 - Doing Connections 1
In this step, connect the three terminals of the RG LED by using
its respective color wire for each LED color terminal. That is, green,
black & red wire should be connected to green, common ground and
red LED terminal respectively while the yellow wire should be connected
to the point of probe. Note that I'm using color tape to identify each
connection that obviously it's optional but you can use them if you want.
Step 26 - Doing Connections 2
For ending the connections, you should join GND & positive terminal
of your project to the black & red alligator clip terminal respectively.
In these terminals, I used color tape dark blue and red to identify them.
Step 27 - Adjusting the Project
In this step, you should adjust the project by manipulating the trimmers
of 5K. That is, just adjust a trimmer by using a screwdriver until the LED
is lit and no more so that you can obtain a red LED lit when a 'zero'
logic is applied. Then just adjust the other trimmer by using a screwdriver
until the LED is lit and no more so that you can obtain a green LED lit when
an 'one' logic is applied. Once adjusted, until your project works correctly,
you can close the box by using the screws included in this kit.
Step 28 - Completing the Project
Once closed the plastic box of your project, you can see its look
and use it for checking your logic circuits that you do since now.
Step 29 - Checking the Project 1
For checking if the project functions correctly, you have to use it. The
suggestion is that this kit be utilized for checking a '0' logic and observe
the color of light lit: in this case, it should be red color. Now, a fast way
would be to take any circuit that you have done and if it works with a voltage
from 3V to 12VDC, you can check your project by connecting the black &
red alligator clips to GND & Vcc respectively where you will check a 'zero'
logic on GND of your own project.
Step 30 - Checking the Project 2
For checking if the project functions correctly, you have to use it.
The suggestion is that this kit be utilized for checking a '1' logic and
observe the color of light lit: in this case, it should be green color. Now,
a fast way would be to take any circuit that you already have done and
if it works with a voltage from 3V to 12VDC, you can check your
project by connecting the black & red alligator clips to GND & Vcc
respectively where you will check an 'one' logic on Vcc of your own project.

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