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June 1, 1976 · TAP

TAP No. 36 - Ultimate (hah!) Red Box, TEL Update, Discovering Unlisted Numbers

TAP No. 36 - Ultimate (hah!) Red Box, TEL Update, Discovering Unlisted Numbers

Al Bell presents the ‘Ultimate Red Box,’ a redesigned circuit built around a precision programmable counter-timer chip that fixes the imprecise pulse-timing problems of earlier oscillator-based designs. Tom Edison’s regular ‘Odds & Ends’ column follows with reader mail and shorter notes.

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