I was sent a Cutie Pie to calibrate. Except that the batteries were dead. That was a problem, because it uses four 22.5 volt batteries, which can still be ordered on-line, but at a cost of more than $100 total. (The customer decided to retire the instrument.) Thats not the first time Ive had trouble finding obscure batteries. Meanwhile, a modern meter gets by just fine on two D cells, whose combined 3 volts can be cranked up to 1500 or so. A lot of batteries must have seemed like a good idea at the time. I had to think about it. The only way to up-convert DC to DC is to turn it into AC (thats why the camera flash goes bweee), and then it can be run through your voltage multiplier or transformer or whatever. These days you can get an oscillator/regulator as an IC, and a few discrete components to finish it up. And the surface-mount components they like to use these days are just little specks on the circuit board. Even transformers come smaller than a pencil eraser. But when youre building circuits with vacuum tubes, it does seem like a good idea to eliminate the need to build circuits with vacuum tubes. Good idea then, nobody needs them now. national-radiation-instrument-catalog/Image513.gif
Posted on: Wed, 31 Dec 2014 23:48:54 +0000
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