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    [SOLVED] Creepage, clearance, and insulation types

    Hi! I already know the definitions for creepage, clearance, type I and type II products. My doubt is: are creepage and clearance requirements applicable just to class II products? Can you relax creepage and clearance strictness thanks to the earth cable in class I? Thank you!
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    Wideband optical communication

    I plan to add a 100% failsafe protection against lightning to my cable modem and the equipment beyond. The idea is routing up- and down-stream signals through separate ~1m optical fibers. Both will have an emitter (laser or LED) and a photodetector at each end, plus the necessary gain blocks...
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    PIC-LCD-PC interfase

    Hi!. I built this frequency counter with a PIC: www.qsl.net/om3cph/counter/lcd/contribs/images/schema1.gif I would like to log the readings on my PC. It has a parallel port, I thought about connecting it to the 7 lines between the PIC and the LCD. Looking at the waveforms there, shorter pulses...
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    Nickel plating PCB pads

    I plan to make a switch using PCB pads for each pole, and the moving contacts will be elastic, gold plated reeds salvaged from PCB edge connectors. The copper pads should be plated with something that resists corrosion and wear, and I want something more polite than Sn solder. My idea is to...
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    Induction heater topologies

    Hi!. It's quite common to see the LCL (series L, parallel C and L) topology after the output transistors in DIY literature. This calls for few turns on the working inductor, of high diameter water cooled copper tubing, with parallel capacitors. Instead, I designed my 50kHz 1kW prototype heater...
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    [SOLVED] Strange problem with high frequency shunt

    I need to measure the current on the power transistors of a resonant induction-heater generator. I know the current towards the load is quite sinusoidal, and expect a half-wave at the drains or sources. If I use a 0.1 ohm shunt built with 18 paralleled resistors, 1.8 ohm each, I get an...

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