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  1. E

    2kW Step-down PWM converter for high voltage dc-BUS

    First, an observation, a 300uH inductor at 50kHz will not give you continuous mode operation (the ripple current is greater than the load current). This will complicate everything: your output caps will need to be huge and the current stress and heating of the inductor will also be significantly...
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    AC Voltage Meter - Non Transformer Solution

    You are welcome. Let us know how you get on. I didn't tell you: the standard to use if you look it up, will be one of the 950 variants (EN60950, IEC950 etc etc) and that standard will tell you the isolation barrier you need must have as a minimum a creepage distance of 6.4mm and a clearance of...
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    Doubts about electrolytic capacitors

    Your friend just wants an excuse to play games and watch TV all the time. Do a quick survey asking people if they make a point of using all of their electronic devices at least once a month to keep them working and if they find the devices fail after long periods of disuse otherwise. That may...
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    Doubts about electrolytic capacitors

    So I did not guess the reason for your question correctly. The reason I was trying to guess is simply because your question cannot be answered without a lot more information being provided. Details such as the manufacturer, part number and part specifications, stresses when in use, total hours...
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    Doubts about electrolytic capacitors

    In days of olde ;) there was an issue occasionally with electrolytics which were said to have "dried out" but that was valve era electronics and maybe a decade or two into the solid state era. Caps from the 90s as far as I am aware should be fine if they were reasonable quality in the first...
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    AC Voltage Meter - Non Transformer Solution

    If you were to use a small transformer but not an instrumentation type the waveform can be so distorted by the transformer it is useless for anything more than a rough guess or the typical, dodgy and usually flawed assumption that peak and RMS voltages have a fixed and incontrovertible...
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    AC Voltage Meter - Non Transformer Solution

    Most electrical safety standards I am familiar with allow a direct connection to mains via a couple of series connected resistors in each and every leg of the circuit separating the mains from your non mains circuit. The resistors should be rated for the peak voltage, be fusible types and of...
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