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Type: Posts; User: thunderdantheman

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  1. Closed: What is the Max RMS System Noise before 'hiss' is can be heard in Headphones.

    This question is a subjective and I understand it is dependent on other factors, however, I’m hoping for some guidelines or experienced knowledge.

    With an audio circuit designed to drive a...
  2. Closed: Re: First attempt at USB differential pair routing on a 2 layer board. Acceptable or

    USB2 is somewhat forgiving although not with EMI. However, you have significant runs and I don’t think it will be that forgiving. Unfortunately your diff pairs are not going to behave as intended....
  3. Closed: Re: Looking for R D MIDDLEBROOK Resources

    Yes have most of the print material... but was specifically interested in watching the course he presented.. It was available to purchase via DVD from his site which is now offline.
  4. Closed: Looking for R D MIDDLEBROOK Resources

    Looking for R D MIDDLEBROOK Resources

    I've recently come across R D Middlebrook and his Design-Oriented Analysis theorems.. It's spiked my interest. However, since his passing his website is no...
  5. Closed: Re: 3 Watt inrush resistor will eventually fail?

    What you want to look for is the pulse rating of the resistor.. Or if not specified for your current part, consider using a pulse-rated resistors.. these are designed and specified (among other...
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    Closed: Re: Ir2110 mos driver burns out

    G'day,

    1. Generally high side and low side of a H bridge are operated at the same frequency (slightly different pulse width to ensure dead time)... I don't quite get why one would operate the two...
  7. [SOLVED]Closed: Using a diode in place of a BJT for a TPM411 Vbe temp sensor IC

    G'day Folks,

    In a current application a TPM411 remote temperature sensor IC (http://www.ti.com/lit/ds/symlink/tmp411.pdf) is used. The IC measures the Vt of a BJT to determine temperature. The...
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    Closed: Re: Rate of Temperature rise of heatsink

    Thanks Orson Cart for the inspiring compliment. My first boss lived and breathed BJTs... it kind of rubbed off on me (and SPICE simulators!) ;) but I owe a lot to the knowledge and willingness of the...
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    Closed: Re: Rate of Temperature rise of heatsink

    A $2 MOSFET is cheap compared to repairing blown tracks or parts on an expensive 16 layer PCB after a technician drops a screw in the guts during disassembley or servicing! The duty cycle will be...
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    Closed: Re: Rate of Temperature rise of heatsink

    Although knowing of their existence, I've never actually used a depletion mode MOSFET... (they tended to skip over them in favor of enhancement types during my time!) but after a quick look into...
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    Closed: Re: Rate of Temperature rise of heatsink

    Results are in... I used a small grid array heat-sink which weighed approx. 35g (I don't have the RJsa value). I haven't got a plot unfortunately as I was using an thermal imaging camera.. But.. I...
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    Closed: Re: Rate of Temperature rise of heatsink

    Thanks for the comments they lead me to the following.. very crude, but am I on the right track for a basic approximation?

    1. Specific heat of aluminium = 913J/Kg.K
    2. Energy to be dissipated =...
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    Closed: Rate of Temperature rise of heatsink

    When designing for thermal requirements, thermal data relates to the steady state final value. e.g. the junction temp of a MOSFET will eventually (theoretically) reach 305degC when dissipating 100...
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    Closed: Re: Software/complier enquiry

    It's C code... for Atmel Micro controllers... download Atmel Code Studio 6 (for windows - it's free but big dl). Or there is the Linux AVR complier toolchain for Linux. Obviously you'll have to run...
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    Closed: Re: Cheap Bluetooth chipset

    Thanks for suggestions, but as Dora suggested, I'm looking for a chip-set rather than a module. I'm surprised there isn't a basic chip-set supporting a cut down stack only supporting simple...
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    Closed: Re: Need help for ring led on Altium

    G'day glias

    Yes you can do that... it's been out since at least AD10. If you open the grid manager and click menu (hiding down the bottom right corner) and select 'add polar' grid. You're allowed...
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    Closed: Cheap Bluetooth chipset

    G'day,

    I'm looking for a Bluetooth chip-set that is readily available and easily interfaces to a micro. There were a few past posts that I found however that part (NXP BGB203) has been...
  18. Closed: Re: some question about gate drivers ICs

    In terms of what MOSFET drivers do.... they act as a buffer between the SMPS controller IC outputs (usually low current source/sink) and the MOSFET gate which is a dirty big capacitor! and if you...
  19. Closed: Suitable Micro-controller to bridge 4Mbps SPI to USB

    G'day,

    I've been tasked the job of cleaning up someone's failed attempt at what they thought was going to be a simple data acquisition system.

    The system has two 8 channel 12Bit 500kS/s SPI...
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    [SOLVED]Closed: Re: Complementary PWM uses

    One use is in power supplies... push-pull comes to mind - centre tapped primary winding, you alternativly switch two FETs on either end. You need the dead band to prevent both FETs being momotarily...
  21. Closed: Re: Inline MOSFET in-rush current controller - not working out for me!

    I'm hearing you Keith that was my original thought.... However I'll try and explain how it is I now understand it..

    1. The gate source capacitance (or more correctly gate-sorce charge Qgs which...
  22. Closed: Inline MOSFET in-rush current controller - not working out for me!

    G'day All,

    Recently I had an in-rush spec added to a design spec from my customer and as usual this was after the hardware design had been approved and manufactured.... typical. Anyway the'yr...
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    Closed: Re: How to get +5V to -5V??

    G'day,

    There are a number of ways... I've used an LT3462A http://www.linear.com/product/LT3462 converter from LT with good results... but it depends on your current requirements... it's good for...
  24. [SOLVED]Closed: Re: Linear Tech Current sense application circuit - need some clarification

    Thanks again guys.... I've learnt a lot! That's a neat little circuit too ZekeR... i'll be sure to tuck that one away. Infact I might even breadboard it this weekend and have a play. For the time...
  25. [SOLVED]Closed: Re: Linear Tech Current sense application circuit - need some clarification

    Awesome! thanks for that guys! understand the concept now and since found a number of high-side current monitor ICs that use that exact circuit, it is indeed common! However... they're all quite...
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