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Type: Posts; User: Zak28

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  1. Closed: Re: Mains leaking currents causing problems in my house

    Wouldn't a buried pipe bonded to PSU chassis be adaquate to resolve his issue?
  2. Closed: Re: Mains leaking currents causing problems in my house

    Here is a 220v variant

    https://www.amazon.com/dp/B013WWKQV0

    its very useful as it detects very common issues, your linked product should work fine also.
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    Closed: Re: HEI primary current duration

    Min automotive rpm = ~700rpm - 1000RPM max dwell for 700rpm = ~84mS long which is plenty to to burn up a low resistance primary HEI coil. According to attached document resistors on the primary used...
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    Closed: Re: HEI primary current duration

    For GM HEI coils are dwell times adjusted by an onboard processor?
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    Closed: Re: HEI primary current duration

    What was meant is reducing the falling edge to keep it below the many thousands of volts it will rise to thus lowering the power dissipation of the RC snubber.






    There has to be a large...
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    Closed: Re: HEI primary current duration

    Would using straight square waves on the primary, but keeping within the rated peak current damage the HEI?
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    Closed: Re: HEI primary current duration

    Do ignition drivers typically adjust the falling edges during ordinary operation to prevent excessive back emf spikes?
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    Closed: HEI primary current duration

    Can the dwell time and period on the primary side be any duration so long as it abides by the maximum peak current?



    Manufacturer's Part Number:D3070
    Primary Resistance:0.350 ohms
    Coil...
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    [SOLVED]Closed: Re: would iron wire block high frequencies

    Would it also slow down sharp unidirectional di/dt edges?
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    [SOLVED]Closed: would iron wire block high frequencies

    Would iron wire become hysteritic and attenuate high frequency AC if it were used as a conductor?
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    [SOLVED]Closed: Re: Diode performance specification

    Most small SMT diodes dont have any charts for recovery time or di/dt.
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    [SOLVED]Closed: Diode performance specification

    Is a fast recovery diodes maximum reverse recovery time the same speed during its max forward current & Repetitive peak reverse voltage or is it much longer than what was specified?
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    Closed: Re: H bridge with IR2110

    There are self oscillating half/full bridge inverters with builtin dead time and can vary frequency with simple components including a potentiometer.
    ...
  14. [SOLVED]Closed: Re: Do The Input And Output Capacitors Effect Efficiency In Switching Regulators

    Wouldn't the ideal method to reduce ESR be to break up the recommended 22uF from switcher datasheet - into 3x 10uF capacitors thereby reducing ESR?
  15. [SOLVED]Closed: Re: Do The Input And Output Capacitors Effect Efficiency In Switching Regulators

    Is this largely due impart MLCCs being leaky?
  16. [SOLVED]Closed: Do The Input And Output Capacitors Effect Efficiency In Switching Regulators

    Would increasing the input and output capacitances were the load is~2mA @ 25v and input is ~8v prolong the battery life?

    For this switcher 155382
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    [SOLVED]Closed: Re: Inductor quality value for switching regulators

    Most datasheets do not mention anything about the material the windings are on. That document isn't of much use for inductors which doesn't have its material specified.
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    [SOLVED]Closed: Re: MOSFET instead of planar resistors

    What feedback arrangements are there without high speed opamps?
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    [SOLVED]Closed: MOSFET instead of planar resistors

    Is it fine to employ to220/247/3P MOSFETs as resistors inplace of similarly packaged planar resistors for constant loads and for switched loads?

    The NMOS would be biased with a precision pot at...
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    [SOLVED]Closed: Re: Inductor quality value for switching regulators

    There are many ferrite formulations each with their capabilities many ferrites will become very lossy at 1200khz with slight magnetizing current.



    They don't need to estimate, they should take...
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    [SOLVED]Closed: Re: Inductor quality value for switching regulators

    There should be a distinct parameter or table depicting core losses as a function of magnetizing current and frequency.

    Currently most datasheets are insufficient about their material losses.
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    [SOLVED]Closed: Re: Inductor quality value for switching regulators

    Can core losses be mitigated for 1200khz by avoiding shielded or partially shielded inductors and use higher resistance parts instead to avoid core losses, or does winding resistance incur greater...
  23. [SOLVED]Closed: obtaining dielectric constant for of a polymer

    Measured 0.480nF for a 8cm x 5cm area using aluminum foil tape, dielectric thickness 0.2mm.

    Whats the method to find dielectric constant for the polymer?
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    [SOLVED]Closed: Re: Inductor quality value for switching regulators

    Is a 1000uH inductor with Q (from datasheet) of 40 measured at 0.796Mhz very lossy for 1200Khz operation?
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    [SOLVED]Closed: Re: Inductor quality value for switching regulators

    Is the SRF more likely to give issues to a switching regulator than a lossy core material?

    Perhaps a lossy material is fine to use if its not saturated to high losses causing excess heat to the...
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