baileychic
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Today, 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 | 102 view(s) -
Today, 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...1 replies | 40 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 | 638 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 | 501 view(s)
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11th October 2019, 01:22welcome to the world of RFI ...3 replies | 268 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 | 425 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 | 1024 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 | 377 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 | 763 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 | 465 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 | 763 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 | 377 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 | 951 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 | 1024 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 | 763 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 | 1024 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 | 370 view(s)
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29th September 2019, 11:29Easy peasy replied to a thread 300W SMPS with low input capacitance at the end of a 10km cable in Power ElectronicsWe have done this for subterranean feeds, 1km, 1800 - 3800VDC in, 350V 40A out, knowing the resistance of the feed wires is useful as it is...9 replies | 465 view(s)
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28th September 2019, 05:32Easy peasy replied to a thread PI Expert Software and its generated circuit designs in Power Electronicsyou can ignore those warnings ...2 replies | 241 view(s)
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28th September 2019, 02:06Easy peasy replied to a thread Why would a scope suddenly give noisy traces when it never used to? in Elementary Electronic Questionsbroken ground wire some where in the scope probe - this is quite common ...6 replies | 376 view(s)
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28th September 2019, 02:04Easy peasy replied to a thread Capacitors in input voltage circuit before and after reverse polarity protection diod in Power Electronicsyou have not explained your questions very well and you are asking several questions inside this thread - your graph above may be the result of...9 replies | 680 view(s)
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28th September 2019, 01:58Easy peasy replied to a thread Mains Harmonic current limits for 150W offline LED driver in Power Electronicsyou are asking us to comment on whether your equipment falls inside a certain specification...? - - - Updated - - - As yours is a lighting...4 replies | 256 view(s)
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28th September 2019, 01:55Easy peasy replied to a thread Current Measure using Current Transducer in Hobby Circuits and Small Projects Problemsthat is quite funny ...2 replies | 260 view(s)
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26th September 2019, 20:44there is a very slight effect from the capacitance of the power devices causing an extra slight delay due to rise time ( and fall time ) of the...9 replies | 468 view(s)
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26th September 2019, 20:27Easy peasy replied to a thread Extracting energy from gyroscope precession in Mathematics and PhysicsNow you just have to get your head around the swing with no friction is difficult to start from rest ( at bottom ).84 replies | 3430 view(s)
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26th September 2019, 08:49The OP expressly did not want a cap dropper solution ....14 replies | 682 view(s)
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26th September 2019, 08:45Easy peasy replied to a thread Extracting energy from gyroscope precession in Mathematics and PhysicsI had overlooked work done against the centripetal force forcing the arms and legs out - angular momentum is constant - but not energy - which...84 replies | 3430 view(s)
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26th September 2019, 07:07Easy peasy replied to a thread Extracting energy from gyroscope precession in Mathematics and Physicsrespectfully, a spinning ballerina's rotational energy does not change as she draws her arms in - rotational speed goes up yes - but energy is...84 replies | 3430 view(s)
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26th September 2019, 00:19Dear Mr Schmitt trigger - I fully understand - all this is a product of the " ask google" phenomena - where students etc can only process...14 replies | 682 view(s)
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25th September 2019, 08:15the 7805 reply was "tongue in cheek" as we say ....14 replies | 682 view(s)
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