PNP bipolar junction transistor (BJT) switch circuits use a weak signal to control a load that needs more power. A transistor switch is “on” when it is saturated, and “off” when it is cutoff. This happens in the same way as the NPN bipolar junction transistor except polarities are reversed.
- 007 Parallel components – Resistors – Light emitting diodes LEDS – Capacitors
- 008 NPN Bipolar Junction Transistor BJT switch including capacitor timed fade off
- 010 NOT gate signal inverter using switch – NPN BJT – 74HC14 IC
- 011 555 timer bistable mode flip flop with light dependent resistor LDR
- 012 555 timer monostable mode one shot
- 013 555 timer astable mode basics
PNP switch YouTube video
Diagram is below the video. Using the link opens the video in a new tab!
Electronics course 9 PNP Bipolar Junction Transistor BJT switch plus capacitor fade off
A lot of the components that I use are in this diode and transistor semiconductor kit.
Kit that has everything you need to learn basic electronics and Arduino.