1. How a PNP Transistor Works
Collector
PNP
2N3906
Base
Emitter
The flat side faces up

2. Take Inventory of your Parts
You will need the following parts from your kit:
Breadboard
220 ohms resistor (red, red, brown, gold)
1000 ohms resistor (brown, black, red, gold)
PNP Transistor
LED (light emitting diode)
9 volt battery lead
3 wires
9 volt battery
Pushbutton switch

3. Use this schematic to construct the experiment.
Build the Circuit
Use this schematic to construct the experiment.
220 Ohm
collector
base -
1K Ohm
9 volts
emitter +
Quick Check:
Your circuit should like this one.

4. Do the Experiment Connect the 9 volt battery.
Observe the brightness of the LED’s.
Press the pushbutton switch.
Observe and compare the brightness of the LED’s.
Release the pushbutton.
Troubleshooting:
If the LED’s do not light up, check to make sure they in correctly.
Check the battery. Does it have voltage?
Are there any breaks in the circuit?
Is the PNP in the right way?