Easy peasy
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Yesterday, 03:57Easy peasy replied to a thread Where to get schematics about SCRs full-wave triggering circuits ? in Power ElectronicsA diac is in fact a triac, with internal resistors such that it breaks down to a volt or so ( as long as there is sufficient current to keep it on )...83 replies | 2753 view(s) -
3rd April 2020, 09:44Easy peasy replied to a thread 12kW power supply spec with vin = 1000v to 880v? in Power ElectronicsWe would do this with 3 x H-bridges in series, 600V devices on each - giving 1800V input max 84A o/p per H bridge @ 48VDC ... Automatic...3 replies | 168 view(s)
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2nd April 2020, 08:47The ringing is normal for light load - the overshoot is not too bad either - try higher loads ....23 replies | 851 view(s)
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31st March 2020, 04:05Easy peasy replied to a thread Is a snubber circuit required with zero-cross optocoupler in Power ElectronicsA snubber is a good idea if the load is unknown, these drivers switch the triac on soon after zero crossing, so the load current will start from...4 replies | 298 view(s)
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30th March 2020, 04:49Easy peasy replied to a thread Dimmer lamp 220v ac (resistor values) in Elementary Electronic Questionsif you want to limit the max gate current to 1A say, then R1 + R2 = 325 ohm, note they must be rated for >200V each to avoid them breaking...2 replies | 233 view(s)
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28th March 2020, 21:09Faulty scope probes or "open ckt" gnd connections will not help in fault finding, hopefully your fet and driver and associated cktry have survived...23 replies | 851 view(s)
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27th March 2020, 23:32A flyback transformer needs a gap in the core ( unless for VERY low power ) to store the energy, It is essentially a well coupled inductor. With...23 replies | 851 view(s)
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27th March 2020, 22:36the fet might well be dead ... - - - Updated - - - or the transformer phasing or gap may be wrong ...23 replies | 851 view(s)
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24th March 2020, 05:02the above modified sine wave will power a lap top charger as will even cruder modified sine system of a single step - mainly because the laptop...10 replies | 658 view(s)
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23rd March 2020, 10:18Easy peasy replied to a thread thought experiment to understand measuring equipment. in Power ElectronicsI think you guys have properly scared him off this thread/site now ...18 replies | 799 view(s)
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20th March 2020, 09:08Easy peasy replied to a thread Inductor question. Why current goes up then down instead of decreasing with frequency in Elementary Electronic Questionsyes opposite effect described - apologies - either a typo or there is a series cap causing a min resonance in Z.9 replies | 508 view(s)
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20th March 2020, 02:15Easy peasy replied to a thread Inductor question. Why current goes up then down instead of decreasing with frequency in Elementary Electronic QuestionsYou are seeing parallel resonance of the inductor - at a certain frequency it will look hi Z - it will then support all the volts from the...9 replies | 508 view(s)
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19th March 2020, 23:13Easy peasy replied to a thread Current sensor upstream of Bulk of output capacitance in DCDC converter? in Power ElectronicsSome of your caps might be a bit iffy - this used to be a prime source of noise once - which was hard to find ...16 replies | 872 view(s)
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19th March 2020, 07:26Easy peasy replied to a thread Current sensor upstream of Bulk of output capacitance in DCDC converter? in Power ElectronicsYep - sure you can try that ...16 replies | 872 view(s)
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18th March 2020, 22:30Easy peasy replied to a thread Current sensor upstream of Bulk of output capacitance in DCDC converter? in Power Electronicsyes there is HF ripple of some sort flowing b/n the internal and external caps, upsetting your ( low cost (?)) I sensor - the only way to...16 replies | 872 view(s)
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18th March 2020, 22:25Easy peasy replied to a thread what if i connect a battery to the electromagnet? in Power ElectronicsDepends on the Lithium chemistry, but most of the energy is delivered at 3V, a quality industrial Li-Fe-PO4 ( prismatic ) delivers from 3.3 ...10 replies | 588 view(s)
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18th March 2020, 22:21it will cause a lot of extra primary current - a bad thing ... when the main mosfet has to turn off44 replies | 1847 view(s)
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17th March 2020, 03:26Easy peasy replied to a thread what if i connect a battery to the electromagnet? in Power ElectronicsMeasure the resistance of your electromagnet if it is 0.5 ohm say ... at 3.0 volts this is 6A, your 18650 cell will not provide this for...10 replies | 588 view(s)
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17th March 2020, 03:24Easy peasy replied to a thread thought experiment to understand radio propagation. in RF, Microwave, Antennas and Opticsit also depends on the effective radiated power - a usual receiver can operate on 0.5uV,13 replies | 723 view(s)
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17th March 2020, 03:22Easy peasy replied to a thread Current sensor upstream of Bulk of output capacitance in DCDC converter? in Power ElectronicsUpstream means the sensor sees all the high freq current info into the capacitor - this will always be more stable ...16 replies | 872 view(s)
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15th March 2020, 21:37Easy peasy replied to a thread Question why one of the MOSFET burn shorted in my SS relay in Power ElectronicsIf, you are using fets from Ali-express - you need to allow that failures will happen ...56 replies | 2232 view(s)
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15th March 2020, 10:30Easy peasy replied to a thread 250VAC, 4A fuse used at 700V input to SMPS? in Elementary Electronic Questionsthis is difference between knowledge gained through testing - and other noises ...11 replies | 683 view(s)
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15th March 2020, 10:04Easy peasy replied to a thread 250VAC, 4A fuse used at 700V input to SMPS? in Elementary Electronic QuestionsWe have performed a lot of DC fuse testing - at 12kW, 700V the source is likely current limited, 20A or so, sand filled ceramic fuses will...11 replies | 683 view(s)
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15th March 2020, 02:54Easy peasy replied to a thread 250VAC, 4A fuse used at 700V input to SMPS? in Elementary Electronic QuestionsCeramic ( sand ) filled 20mm fuse will be fine - they are designed to handle a lot more than you expect ...11 replies | 683 view(s)
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13th March 2020, 04:20Easy peasy replied to a thread [SOLVED] Op amp testing question about feedback loop in Analog Circuit Designyou need to look at the WHOLE circuit - not just the op-amp bit ...5 replies | 637 view(s)
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13th March 2020, 04:19Measure the inductance of the coil with and without the core present - the ratio of inductance is a fair measure of the relative permeability of...15 replies | 939 view(s)
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12th March 2020, 05:04Easy peasy replied to a thread Full wave bridge rectifier but doing half wave in Analog Circuit Designuse two scope probes and subtract them ( Ch1-Ch2 ) to see what is going on without shorting the 0v of the ckt ( cos the sig gen has an earthed...10 replies | 714 view(s)
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11th March 2020, 04:24Easy peasy replied to a thread Question why one of the MOSFET burn shorted in my SS relay in Power ElectronicsIf we are to believe your earlier posts - you have already captured the G-S turn on - so it is difficult to see the issue here. As stated...56 replies | 2232 view(s)
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11th March 2020, 03:13Easy peasy replied to a thread Full wave bridge rectifier but doing half wave in Analog Circuit Designthe output of the AC xfrmr is not earthed ...10 replies | 714 view(s)
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11th March 2020, 03:11It is mainly the Z of the nearest electro ...5 replies | 399 view(s)
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- founder MagnetPowerNZ Ltd
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