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Or Gate Circuit

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ldmbgh

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Hi
1. Can you explain,the circuit,of OR gate, at the url:
http://www.technologystudent.com/elec1/dig2.htm
the picture with 2 BJT NPN transistors,
in the state of:input a=0,input B=0,
why the output is 0 ?
according to the circuit,the bulb should light,
because,there is a complete path from the 6+ volt ,
to the 0 volt.

2. Does that circuit, contains only one,voltage source,
or 2?
 
The transistor gates are drawn WRONG!
I corrected them at the other site you asked at.
 
wow, now that's simply amazing how wrong those circuits are. I sure hope no one actually believes them. I don't even think you need to understand transistors to see that the AND circuit will never light the bulb.
 
ldmbgh said:
Why the AND circuit ,will never light the bulb?
Duh!
The light bulb is shorted!
Also, the resistor limits the current too much.

EDIT: removed another short across the supply.
 

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  • transistor AND gate.PNG
    transistor AND gate.PNG
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Last edited:
Nigel Goodwin said:
Isn't there a dead short directly across the supply as well, at the left hand side?.
Yes, hee,hee. The wrong schematic was a winner.
 
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