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Now downloading free:HP HP-Bench-Briefs-1987-10-12

Download HP HP-Bench-Briefs-1987-10-12 docs - Various electronics service manuals

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File name:HP-Bench-Briefs-1987-10-12.pdf
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HP-Bench-Briefs-1987-10-12.pdfSERVICE INFORMATION FROM HEWLETT-PACKARD 4th Quarter 1987 When a number is expressed in bi- REF nary or binary-coded decimal and an analog voltage is to be produced to represent the number, the most prac- tical way to perform this conversion is to add the currents having values proportional to the weights of the G binary bits. Figure 1 represents a simplified binary weighted D/A con- verter. Switches S1 to SN represent the binary bits and connect either to ground or a reference voltage. Figure 1 shows switch S1 connecting R to the reference voltage and all other switches connected to ground; but since point A is a virtual ground, there is no current through 2R, 4R, up to 2N-1R. The amplifier has, therefore, a gain of = -0.5 If

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