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Type: Posts; User: SparkingDog

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  1. Closed: How to Specify and Tolerance a "Sharp" Point

    I need to have an electrical probe machined; but I am unsure how to specify my requirements. I am an electrical engineer with only moderate mechanical knowledge.

    The probe will be machined from...
  2. Closed: Re: How to avoid audio coupling between channels when designing a PCB?

    I concur with jiripolivka. My emphasis: Watch out for shared impedances, particularly on power and ground. Many audio ICs put both channels in the same chip so you can't physically separate them....
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    Closed: Re: Is my High-side MOSFET Really Off?

    That is very helpful. I think I will use 100mV/decade for design and just keep an eye out for any risks or contrary results.

    I also suspect that typical max leakage specs may be overly...
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    Closed: Re: Is my High-side MOSFET Really Off?

    Thanks that is just the kind of authoritative source I was looking for. Unfortunately the highlighted section in the link only gives an example value for "n". What is needed is a maximum practical...
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    Closed: Re: Is my High-side MOSFET Really Off?

    You might be right; but, in the absence of specific authoritative information to the contrary I will continue to hope for a solution.
    These are my reasons:
    1. Much of the process variation is...
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    Closed: Re: Is my High-side MOSFET Really Off?

    Again, my question is about the properties of FETs not about a solution to a specific circuit.

    But responding to your suggestion:
    A CMOS IC running off battery voltage to control the P FET could...
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    Closed: Re: Is my High-side MOSFET Really Off?

    The question is about FETs in general - not my circuit. But the problem is that, generally, if you are building low power circuits from discrete FETs you must use high value resistors as...
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    Closed: Re: Is my High-side MOSFET Really Off?

    I realize that the graphs are for typical values. I was just surprised by the orders of magnitude difference. Also I was once told by an App Engineer (about a microcontroller) that the 1uA leakage...
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    Closed: Is my High-side MOSFET Really Off?

    I am designing a real high-side switch circuit but my questions really apply to mosfets in general.

    The datasheets for discrete mosfets generally specify a Vgs Theshold (example: -0.45V @...
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    Closed: Cost Effective Banana Jack Solution

    I am trying to come up with a low cost - and no tooling solution to adding a vertical banana jack to my PCB. No tooling because I'm starting with a small batch. But I hope to ramp up; so, it should...
  11. Closed: Re: OPA355 with excessive and asymetric overshoot

    This is an image of the layout if that helps.
    102101

    - - - Updated - - -

    This is the first design I have done with a bandwidth this high. I would appreciate any insight from those with more...
  12. Closed: Re: OPA355 with excessive and asymetric overshoot

    What in the layout could cause asymmetric overshoot?
    I would be grateful even for speculation.

    I believe I have been very careful in my layout. Tight placement of components; removal of planes...
  13. Closed: OPA355 with excessive and asymetric overshoot

    I am stumped. I have an VFA (OPA355) ckt configued with gain=+2. Rf=499ohms, Vs=+/-2.5V. I have done everything I can think of to minimize stray capacitance. The amp has good decoupling.
    The amp...
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