Sometimes i test the above circuit.

 

Only a bad transistor would explain the behavior you're seeing.

You should delete post #16. It seems to reveal personal information.

So you have concluded the only explanation is a bad transistor?

 

Drawn more conventionally:

So you have concluded the only explanation is a bad transistor?

Based on the information you've provided.

 

instead of arguing about wrong info, do this instead using the TIP36C and any NPN.


http://tinyurl.com/2xybwgso

Or define what you want to do with what you got. The diode isn't optional. It prevents flyback of -200V from rapid turn off.

This is simpler.



http://tinyurl.com/yuzkez85

With only unipolar drive, it is fast start, slower stop.

The R values were carefully calculated for low hFE, but small changes are OK.

Double check your BCE connections.

 

instead of arguing about wrong info, do this instead using the TIP36C and any NPN.

View attachment 313545
http://tinyurl.com/2xybwgso

Or define what you want to do with what you got. The diode is optional

I want to get it to turn a motor on and off

 

You think i should buy a new one?

 

I want to get it to turn a motor on and off

With what type of switch?

If this circuit powers the motor, the PNP is shorted. i.e. NG

 

With what type of switch?

If this circuit powers the motor, the PNP is shorted. i.e. NG

View attachment 313549

I want to make sure the transistor turns on the motor when connected to a negative voltage and turns the motor off when connected to a positive voltage.

 

I want to make sure the transistor turns on the motor when connected to a negative voltage and turns the motor off when connected to a positive voltage.

Then a diode is what you need. Not a transistor.