Instructables

Logic Probe w/display

Picture of Logic Probe w/display
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Logic Probe w display.jpg
This project is equipped with 5 Not Gates, 1 transistor, 8 resistors, and 1 Common Anode Display. The Logic Probe w/display is a project for identifying Zero (0) or Low, One (1) or High, or Pulse. For Zero, you will see illuminated the upper side of the display by simulating a "0" (Zero). For One, you will see illuminated the rest of display for forming a "P" without illuminating the upper side of the display by simulating a "1"(1). Finally, for a Pulse, you will see illuminated the display by forming a "P"(Pulse). And so you can detect "0's", "1's", and Pulses. 
 
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Step 1: List of Materials

Picture of List of Materials
The list of materials is the following:
1 Prototype Board
1 Green Display CA
1 7404
1 IC-socket 14-pin
1 Transistor 2N3904
5 Resistors of 330 Ohm
1 Resistor of 470 Ohm
1 Resistor of 10K Ohm
1 Resistor of 1K Ohm
1 +5V Standard Regulator
2 Electrolytic Capacitors of 47 microF, 50V
1 Battery Clip, For 9 Volt
1 Test Leads, Banana, 42 inches, 1 Red, 1 Black
1 Binding Post, Breadboard, Screw, Type, Chassis Mount, 1 Black, 1 Red

9 V Battery is not included

Required tools or supplies:
Soldering iron
Solder
Wire stripper and cutter
Needle nose pliers
1 Jumper Wire Kit (Radio Shack Part # 276-173)

Step 2: Install the components

Step 3: Complete your project

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9 Volt Battery is not included

Step 4: Logic Probe w/display in action

Picture of Logic Probe w/display in action
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Probe Digital Circuits

The sequence of pictures:

Low "0"
High "1"
Pulse "P"
This would be handy for a project that I am working on. I have more than enough spare parts I am going to make this now. :D
braulio777 (author) 1 year ago
Logic Probe w/display by itself doesn't need a power supply, but it takes voltage from the electronic device's power supply under probe. However, with this power supply included in your project, you can provide voltage to your circuit that you are probing. Then you have two in one.
blkhawk1 year ago
You should try the free software Fritzing to create the schematics. Great project by the way!
braulio777 (author)  blkhawk1 year ago
I've a question for you. Is the software extensible for more components and how to edit them? That is, more IC's 74xx or resistors, etc. Thank you beforehand for your help that you can give me.
Sincerely,
Braulio777
Sorry that I can't provide you with that information but you can try to contact the creators of the software. I suggested the software so that you could create a nice schematic of your project.
braulio777 (author)  blkhawk1 year ago
Anyway, thanks.
braulio777 (author)  blkhawk1 year ago
Thanks