serendipity

Posted on Feb 4, 2014

The above circuit is a fluid level meter that converts the level in the container on the left into a single-digit number, from 0-9 on a seven-segment display. In this case, 0 (zero) represents the lowest level, and 9 (nine) is the highest level. When in the Course of human events, it becomes necessary for one people to dissolve the political bands which have connected

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them with another, and to assume among the powers of the earth, the separate and equal station to which the Laws of Nature and of Nature`s God entitle them, a decent respect to the opinions of mankind requires that they should declare the causes which impel them to the separation. Finally got the intensity problem fixed on the new (used) scope. It was a couple of bad diodes and some supporting components. I tried to get the originals, but that was not going to happen in any decent time frame. Trusty ol` 1N4004 diodes don`t have the fancy low-capacitance, high-switching-speed of the original diodes, but they have more than enough reverse voltage and power handling. . . Hmmm. . . would they work YES! The scope is all calibrated now, and works like a charm. Now that the brightness works I can see what the whole Inten`D thing is for (my old Heathkit scope didn`t have delayed triggering). Pretty cool! Found and downloaded a free manual (images scanned into a PDF). It was needed for the schematics to fix the intensity problem, but it also included the calibration procedures. The guy who sold it was a bit of a sleaze bag (imo). He said, directly, that he wasn`t aware of any problems, though he took a picture of it with the traces showing pulses. To me, that means he would have fiddled with the focus and intensity controls and seen that the intensity control had no effect. I spent a bit of time with it, and while it needs some...

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