haroldjclements
- Oct 17, 2013
- 24
- Joined
- Oct 17, 2013
- Messages
- 24
I have a question on PNP transistors. Everywhere I read it tells me that a PNP transistor needs a negative voltage to the base in order for the transistor it turn on. However, I have created a Micky Mouse circuit (attached) and do not understand how it is working.
I am happy with the NPN part when the switch is open. A am also happy that when the switch is closed, the base of the NPN drops to 0v causing it to turn off. However, this is where I get confused. The PNP transistor turn on, but the voltage to base is high (not negative as I am led to believe should turn the PNP transistor on). I have used a meter to vitrify this.
Now the current going to the base of PNP transistor is high when the switch is open and is at 0mA when the switch is close. Could this be what is turning the PNP transistor on. If so, why dose all the literature that I have read say that its negative voltage?
Thank you for your help,
Harold Clements
I am happy with the NPN part when the switch is open. A am also happy that when the switch is closed, the base of the NPN drops to 0v causing it to turn off. However, this is where I get confused. The PNP transistor turn on, but the voltage to base is high (not negative as I am led to believe should turn the PNP transistor on). I have used a meter to vitrify this.
Now the current going to the base of PNP transistor is high when the switch is open and is at 0mA when the switch is close. Could this be what is turning the PNP transistor on. If so, why dose all the literature that I have read say that its negative voltage?
Thank you for your help,
Harold Clements