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I drew an AND gate as follows which mimics this diagram.

   --- +6V (A)
    |
i1-<
    |
i2-<
    |- out
    v
    ground (B)

I understand how current flows between A and B(when both inputs are logical 1) because there is difference of voltage, maybe 6V, and AFAIK A and B are possibly connected making a circular circuit(at least via earth).

But I don't understand how current can flow from some signal sources to two transistors to manipulate transistors. There seems no difference of voltage regarding i1 and i2. I want to know the entire circuit diagram including the signal sources.

PS. Are there 3 separate circuits containing i1, i2, A-B, respectively?

I drew an AND gate as follows which mimics this diagram:

(source)

I understand how current flows between A and B(when both inputs are logical 1) because there is difference of voltage, maybe 6V, and AFAIK A and B are possibly connected making a circular circuit(at least via earth).

But I don't understand how current can flow from some signal sources to two transistors to manipulate transistors. There seems no difference of voltage regarding i1 and i2. I want to know the entire circuit diagram including the signal sources.

PS. Are there 3 separate circuits containing i1, i2, A-B, respectively?

I drew an AND gate as follows which mimics a diagram.

   --- +6V (A)
    |
i1-<
    |
i2-<
    |- out
    v
    ground (B)

I understand how current flows between A and B(when both inputs are logical 1) because there is difference of voltage, maybe 6V, and AFAIK A and B are possibly connected making a circular circuit(at least via earth).

But I don't understand how current can flow from some signal sources to two transistors to manipulate transistors. There seems no difference of voltage regarding i1 and i2. I want to know the entire circuit diagram including the signal sources.

PS. Are there 3 separate circuits containing i1, i2, A-B, respectively?

I drew an AND gate as follows which mimics this diagram.

   --- +6V (A)
    |
i1-<
    |
i2-<
    |- out
    v
    ground (B)

I understand how current flows between A and B(when both inputs are logical 1) because there is difference of voltage, maybe 6V, and AFAIK A and B are possibly connected making a circular circuit(at least via earth).

But I don't understand how current can flow from some signal sources to two transistors to manipulate transistors. There seems no difference of voltage regarding i1 and i2. I want to know the entire circuit diagram including the signal sources.

PS. Are there 3 separate circuits containing i1, i2, A-B, respectively?

I drew an AND gate as follows which mimics a diagram.

   --- +6V (A)
    |
i1-<
    |
i2-<
    |- out
    v
    ground (B)

I understand how current flows between A and B(when both inputs are logical 1) because there is difference of voltage, maybe 6V, and AFAIK A and B are possibly connected making a circular circuit(at least via earth).

But I don't understand how current can flow from some signal sources to i1 and i2 to manipulate transistors. There seems no difference of voltage regarding i1 and i2. I want to know the entire circuit diagram including the signal sources.

PS. Are there 3 separate circuits containing i1, i2, A-B, respectively?

I drew an AND gate as follows which mimics a diagram.

   --- +6V (A)
    |
i1-<
    |
i2-<
    |- out
    v
    ground (B)

I understand how current flows between A and B(when both inputs are logical 1) because there is difference of voltage, maybe 6V, and AFAIK A and B are possibly connected making a circular circuit(at least via earth).

But I don't understand how current can flow from some signal sources to two transistors to manipulate transistors. There seems no difference of voltage regarding i1 and i2. I want to know the entire circuit diagram including the signal sources.

PS. Are there 3 separate circuits containing i1, i2, A-B, respectively?