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Using bipolar transistor for wwitching

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Using bipolar transistor for wwitching

Postby nissim » Sun May 06, 2012 9:55 am

Hi There

I am trying to switch an LCD display from a micro port .
My circuit works fine without a load .
When I use LCD as a load the transistor does not turn off and instead 0vdc
I get 3.75VDC.
I tried 10K resistor across the load but same problem

I would appreciate if someone could explain me the reason for the problem and suitable solution .
If bipolar is not a suitable solution I will consider using N MOSFET

Many thanks
Nissim
Attachments
Switching LCD.jpg
Circuit to switch a load using Bipolar transistor
Switching LCD.jpg (94.79 KiB) Viewed 5398 times
nissim
 
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Joined: Sun May 06, 2012 9:45 am

Re: Using bipolar transistor for wwitching

Postby pebe » Sun May 06, 2012 10:58 am

The feed from the micro to Q2 base should include a resistor to limit the base current. Perhaps Q2 has been damaged and has gone s/c from emitter to collector and is keeping Q1 switched on.

Other than that, there is no reason for the circuit not to work
pebe
 
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Joined: Tue Dec 09, 2003 11:12 pm
Location: Ellon, Scotland


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