Hi Simmon,
Before addressing your current question, let me say that I have known you as Billy Mayo (ETO),Danny Davis (EDA Board), DexterMccoy (AAC), and Simmon (EP). You have been banned from at least two of those accounts for trolling. You are fooling no one.
Moving forward, let's establish a basis of openness and honesty for future dialog. There are a lot of people here who would like to help you. But, since that help is offered as good will, I think you need to be honest in return.
Now, for your present question. Is it related to your attempted repair of autopilots for airplanes? I have no problem helping you with that, if that is the case, since the design is antiquated. However, that fact might make a difference to some others who would normally want to help you, as was discussed on ETO.
Second, what is your real question? Why is the answer important to you? What difference will the answer make in what you do tomorrow, next week, or next month at work?
Finally, you stated quite clearly how two emitters can be used to create an AND gate in your previous post (#5). I asked before what you do not understand of your own words, and you ignored my question. So, I ask it again. Let's have dialog rather than a one-way street.
John