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    E12 Resistor Series

    Good morning Mixos. Either my groggy eyes deceive me or the colors aren't rendering correctly on my computer. Your entry for 100K looks like1G0. Also you showed 010 for 100R. You may want to put a "G" for the third band on the sub-10 ohm values.
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    mercury switch

    I'm surprised there aren't alternatives for tilt switches in your neighborhood. I have trouble finding a catalog that doesn't have something in this category. Granted, a steel ball rattling about inside a cage won't make as good a connection as a puddle of mercury, but it's something to start...
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    negative impedances

    Yes to the last one. The circuit is more complicated. The term "negative resistance" is used to describe the behavior (oops, most of the folks here are in Europe, so that's behaviour) of the device as the voltage (or current) varies within the range so described. Instead of voltage and...
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    Bridge Rectifier Selection

    A higher rated bridge will more easily tolerate voltage transients and startup surges. Also it may have a slightly lower voltage drop.
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    Absolute Newbie needing help

    Greetings asciifish! Your profile doesn't say where you hail from. I burned a few iron-on transfers for a JDM type programmer (serial port). They're not tested yet, but when they are I'd be glad to send one to you if the postage isn't unreasonable.
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    EEG Amplifier

    Probably best to use an instrumentation amplifier. These can be a bit spendy, but one can be cobbled from three opamps (and they'd best be from a quad for better device matching). From that a current loop driver would be good, and an optoisolator too. I'll try to find an illustration I have...
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    Voltage Multiplier

    All of the capacitors in a voltage multiplier contribute to the impedance. Until I read otherwise I'll go with my belief that they work best when all of the capacitors are of the same value.
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    power vs. signal frequency

    Disclaimer: This is somewhere between conjecture and fantasy, so a schematic of my ideas is a bit difficult to produce. That much taken care of... russlk: I'm constrained by a few realities. The wire size is about 22ga, and I'd like to locate some gadgets 50m or more from the power supply...
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    IR receiver modules, why 38kHz

    I'll confess that I haven't seen more than a dozen articles so far, but from what I have seen it seems that 38kHz is the most popular. Why? Did I miss something? Left to my own devices, I'd've picked 40kHz because a uC running at x.000 MHz can get the right frequency dead on. Also this...
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    power vs. signal frequency

    MP: I understand that filtering can remove a lot of interference. I'm hoping to make that unnecessary by aligning the bits (timewise) with the center of the flattened peak of the power (when the ringing is the least). Staigen: Yes to the first question. At the moment this is conjecture...
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    power vs. signal frequency

    Is there any serious problem with signal lines being close to power lines as long as the frequencies are the same and they are synchronized? FWIW, I was thinking about using 15VAC (square wave, two phase, moderate frequency) to power some remote gadgets with a piece of telephone line.
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