help with Rene Schmitz Signal Switcher schem

[artilect99]

I feel like an idiot, but I was wondering if anyone could help me interpret this schematic:



I assume the switch box in the top 3 blocks is the very bottom circuit...? But then why are there three identical blocks shown on top? How does the very bottom block fit into the rest of the circuit? Are the A, B, C on the 4053 used as the two ins and one out to fit into the top circuit? Looking at the datasheet that doesn't seem to make sense, but then I don't know much about this chip.

If anyone can help translating this, it would be much appreciated! [/img]

[blue hell]

Almost all good .. but the ABC ins are the select inputs controlling the three 2 to 1 switches drawn outside the box .. the three switches are independent of each other.

A (pin 11) controls which of the A inputs (pin 12 for ax, pin 13 for ay) goes to the A output (pin 14), and similar for B and C.

Now when you do the same thing for all three blocks .. say the y pin at the top and the x pin at the bottom the A, B and C control inputs will switch the three channels "the same way" (with a low value on the transistor input, which causes a high value on the ABC ins this will select the y (which I chose to be top) inputs to be switched to the outputs).

[artilect99]

Ah, thanks Blue Hell, makes total sense now. I don't know how I missed this diagram before (must have been looking at a diff. datasheet) but after seeing this and your explanation its obvious.

So the three identical copies are just to make use of the entire chip, switching 3 pairs of signals. I was thinking of a single A/B switch.

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[blue hell]

Ah yes .. there are three different versions which are usually in the same data sheet .. a bit confusing that :-)