1. Payload 2015 Class 9
By Jeff Dunker
5/19/2019
2014 Beginner Payload

2. Project 2 Logic Probe Bread Board
470 (if 9V battery used) Why?
PN2222a C
The probes for the circuit
are in blue. The ground
connection below is left off
many schematics assuming
that everyone knows that
the circuit must have a
common ground. Why? B E
E B C
Long pin
The datasheet
has the pin-out
and many other
important pieces
of information on
our part.
Flat side
I made a probe out of a popsicle stick, heat sink tubing
And some solid core and stranded wire
Solid core for tip
Stranded for flexibility
5/19/2019
2014 Beginner Payload

3. Project 2 part list beginners
1 100K Resistor
Resistor
2 2N2222 transistors
1 LED
Exercise: Everyone figure out what are the colors for the resistor above. We’ll then share the answers
Now get the needed parts, note I have put some parts that may look like the correct one, but aren’t.
5/19/2019
2014 Beginner Payload

4. Remember how we laid out the bread board for project 1
Now it is your turn to do your own.
Don’t waste time if you don’t know ask me questions.
The guidelines I gave you last still apply and yes we have a couple new and different parts
The main difference is we have three active components and all must be connected up in the proper order/direction
5/19/2019
2014 Beginner Payload

5. How to test Project 2 This is a logic probe
We want it to indicate a High RED LED On (logic 1’s) for a positive voltage applied to the input and a Low Off for (logic 0’s) for a for a ground level signal applied to the input.
HINT: +9v is High and Ground is low
5/19/2019
2014 Beginner Payload

6. Soldering up our circuit
Follow the guidelines I gave you last time for soldering they still apply and yes we have a couple new and different parts
The main difference is we have three active components and all must be connected up in the proper order/direction
Now it is your turn to do your own.
Don’t waste time if you don’t know ask me questions.
5/19/2019
2014 Beginner Payload

7. Solder Project 2 You have the rest of the class to solder them up
Please plan to have more than one project per proto board as they are in short supply
Plus you will find that it can actauly help future projects
5/19/2019
2014 Beginner Payload