The sum and difference frequencies were then available in the mixer's anode circuit.
2.
The presence of a resistor in the anode circuit causes a large variation in voltage to appear at the anode.
3.
The valve's inherent non-linearity causes not only both original signals to appear in the anode circuit, but also the sum and difference of those signals.
4.
In the " gfedcba " representation, a byte value of 0x06 would ( in a common anode circuit ) turn on segments'c'and'b', which would display a'1 '.
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