I'm trying to make 1 bit RAM using four transistor ( 2 NOR Gates ).
I built the 2 copies of the following circuit:
I connected a LED to the output "F". Also, I connected Another LED to the output of the second circuit ( because I build two Identical copies ) to test them before I continue.
The problem is that when I connect any Input of both circuits to HIGH, The two LEDs turns off rather than one led. And that means the outputs of the two circuits are somehow connected together. In other words, when the base of any transistor is HIGH, the transistor works as a short circuit ( wire ) for the 2 LEDs so that they both turns off.
I Thought I was mistaken and completed the circuit as shown :
But the result is that the LEDs are always off.
What can I do to separate between the two outputs Q and Q' ?
Does a floating input mean it is LOW ?
Note : I used only R1 and R2, and I Didn't use R , R3 and R4. I connect the bases of the transistors directly to the positive terminal To make them HIGH.