And gate circuit

[JamesGale]

I have a AND GATE circuit diagram i just need help getting this drawn onto a breadboard circuit board, can someone please help me with that...

Thanks,
J.Gale


**broken link removed**

 

[MikeMl]

What is the 330K at the output supposed to do? Oh, that is a LED?

A high brightness LED will illuminate brightly enough to be seen even in sunlight with 5mA flowing through it; 10 is better.

With 9V out of the battery, and two VceSat drops (~0.3V ea), less the Forward voltage drop across the LED (~1.8 to 3.3V, depending on color), the LED current limiting resistor will have ~5.5V across it, mean that to get 5mA, it would have to be 5.5/0.005 = 1K.

What is the 10K from emitter to ground supposed to do?

 

[JamesGale]

Yes the output is the LED and the purpose of the emitter to ground is the high low voltage flow which allows the connection of the LED to turn on and off with taking a wire and changing between negative and positive I believe?... I'm not the greatest with this but all I know its suppose to turn the LED on and off would you be able to assemble this on a breadboard ?

Thanks

 

[MikeMl]

Here is a simulation of your (modified) circuit. I had to move the LED and current limiting resistor to the high-side of the circuit. With the LED in the emitter side, there was some leakage current through the LED even when it is supposed to be OFF. Note that current flows through the LED I(D1) only when both V(A) and V(B) are high at the same time.

 

[Dragon Tamer]

I would follow Mike's circuit, your circuit is an emitter follower and if your voltage goes down to 3V then it will not work at all.

 

[JamesGale]

Thanks a lot mike, but is it possible to transfer this over to a breadboard diagram? with a help of a program, suggestions?

 

[MikeMl]

Thanks a lot mike, but is it possible to transfer this over to a breadboard diagram? with a help of a program, suggestions?

James, are you asking how do I wire a bread board? Have you seen these solderless breadboards and this wire kit.