Easy peasy
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Today, 09:55Q4 is not needed - Q3 will dissipate, Ifan * 15V so be careful there ...14 replies | 228 view(s) -
Today, 08:36Easy peasy replied to a thread Mains leaking currents causing problems in my house in Elementary Electronic QuestionsA PC psu should be designed to at least 2.5kV ac phase to o/p's if not it is a very bad PC to own a dish washer could be run thru an...43 replies | 2017 view(s)
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Today, 08:31Easy peasy replied to a thread Calculate Capacitance Value from Smith Chart in RF, Microwave, Antennas and Opticshe reactive part is 77.16 ohms, this is the sum of the Xc & XL, at 205MHz it is basically all capacitive so yes = Xc7 replies | 170 view(s)
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Today, 06:55A flyback is also a buck-boost ( the original in fact ) - - - Updated - - - as is a Sepic6 replies | 160 view(s)
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Today, 06:51R's are fine - but extra power draw / loss and no guarantee of sharing at power up where fans can and do draw more than 5x the run current - ...14 replies | 228 view(s)
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Today, 06:49Easy peasy replied to a thread Calculate Capacitance Value from Smith Chart in RF, Microwave, Antennas and Opticsthe Smith chart is for a specific 10pF cap, that is clue #1, it is not explicitly shown on the Smith chart, but the 77 ohm at 205MHz gives you...7 replies | 170 view(s)
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Today, 04:09Easy peasy replied to a thread Mains leaking currents causing problems in my house in Elementary Electronic QuestionsYou could go around cutting out all the Y caps ( RFI caps that go from phase & neutral to "earth" ) inside the appliances that have them - ...43 replies | 2017 view(s)
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Today, 04:00a 5W 16V zener across each fan will be the way to go, else a buck converter to 15V to run both of them in //.14 replies | 228 view(s)
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Today, 03:57CMOS gate parts can do this easily @ 2.5MHZ look up the CD4000 series - there should be a shift register type part that will do it in 16...6 replies | 184 view(s)
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Today, 03:55boost converter usually has low side drive to the fet which is easier, buck converter needs a level shift driver or a P channel fet - more...6 replies | 160 view(s)
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Today, 03:52Easy peasy replied to a thread Calculate Capacitance Value from Smith Chart in RF, Microwave, Antennas and OpticsThe smith chart for that cap shows you that at 205MHz it is 10pF ( 77 ohm ) and 50 ohm resistive ...7 replies | 170 view(s)
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Yesterday, 10:00the noise flows from right to left - ideally the CM caps need to be on the LHS ( left had side ) in order to get a CM LC filter - this can...3 replies | 170 view(s)
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Yesterday, 08:34bigger caps = shorter current pulse = higher rms current draw = more heating in diodes and wires ... 45V, 10A schottky a good idea if pk...10 replies | 606 view(s)
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Yesterday, 00:13Is a round-a-bout way of saying there are proximity losses in the copper wdgs associated with the windings - these losses are lower for higher...4 replies | 166 view(s)
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Yesterday, 00:08better to have a pwm buck converter drive the heater from the batteries such that there are no sudden changes in the battery voltage OR: drive...3 replies | 154 view(s)
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11th October 2019, 01:34Easy peasy replied to a thread Closed-loop Stable for Negative Phase Margin? in Analog Circuit DesignThe bode blot requires that you consider the 1st crossing of the gain plot, not any later ones, if there is phase margin at the 1st crossing, it...8 replies | 642 view(s)
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11th October 2019, 01:29there is a fair chance your led will eventually die if subjected to unlimited current flow pulses ... opto's turn off slowly due to carriers stuck...11 replies | 520 view(s)
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11th October 2019, 01:22welcome to the world of RFI ...3 replies | 276 view(s)
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11th October 2019, 01:20Easy peasy replied to a thread Film capacitor failed in flyback smps at high temperature? in Power Electronicshi temp = expansion of either type of cap = end termination failure = cap goes low capacitance ....5 replies | 440 view(s)
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5th October 2019, 01:19certainly you will need soft turn off of the igbt to avoid a spark - if you are calculating dwell periods based on current rpm -13 replies | 1034 view(s)
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5th October 2019, 01:18Easy peasy replied to a thread Why use diff mode inductors rated for 6A(rms) when Input current is only 833mA(rms) in Power Electronicsdepends on the size of transient you are required to resist - in avionics it could be quite important ...!6 replies | 382 view(s)
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5th October 2019, 01:16Easy peasy replied to a thread Supply 5V, 5mA from the 240VAC mains without SMPS in Power Electronicsthose ckts are risky in that if the fet fails - the following ckts and any isolated wdg's on any comm's transformers go poof ...!13 replies | 769 view(s)
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4th October 2019, 02:13Easy peasy replied to a thread 300W SMPS with low input capacitance at the end of a 10km cable in Power Electronicsthere are standard solutions for 1400V ( + safety margin ) to 60V - and 5 amps out is pretty easy - 1/2 bridge with cascaded devices ...9 replies | 470 view(s)
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4th October 2019, 02:11Easy peasy replied to a thread Supply 5V, 5mA from the 240VAC mains without SMPS in Power Electronicsyes the mosfet ( or igbt ) has volt and current limit - the big R is to limit the Pdiss of the device and act like a fuse if it goes short - ...13 replies | 769 view(s)
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4th October 2019, 02:07Easy peasy replied to a thread Why use diff mode inductors rated for 6A(rms) when Input current is only 833mA(rms) in Power Electronicslow heat dissipation, high transient capability, - they were in stock ...6 replies | 382 view(s)
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4th October 2019, 02:03Easy peasy replied to a thread [moved] Why Zener getting heat at no load in Capacitor power supply arrangement.. in Power Electronicsbecause a cap dropper psu circuit is a current source - if you remove the load ALL the available current goes thru the zener - heating it - ...14 replies | 971 view(s)
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4th October 2019, 01:59my reply concerned a single coil system - you appear to have misread it ...13 replies | 1034 view(s)
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29th September 2019, 11:43Easy peasy replied to a thread Supply 5V, 5mA from the 240VAC mains without SMPS in Power Electronicscontrolled HV mosfet with good sized R in the drainto dissipate most of the power - control mosfet for 5.00V out and 7mA curr limit = pretty easy...13 replies | 769 view(s)
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29th September 2019, 11:40for a single coil the dwell time is limited by the rpm, lots of dwell avail at idle speeds - less so at 7000 rpm ( 3500 rpm on dizzy ) as the...13 replies | 1034 view(s)
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29th September 2019, 11:34Easy peasy replied to a thread humbucker preamp - j201 gain is 1:1, why ? in Elementary Electronic Questionsthe fet looks like it will be biased off - make sure it is not dead ...6 replies | 375 view(s)
About Easy peasy
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- founder MagnetPowerNZ Ltd
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- engineer
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