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Type: Posts; User: crutschow

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  1. [SOLVED]Closed: Re: type 1 compensation in voltage regulators

    As noted, the regulator feedback loop is DC.
  2. Closed: Re: sampling rate vs rate of change of input for control system

    No.
    You get 20 points with a 12-bit resolution for each point (sample).
    You are confusing time resolution with amplitude resolution.
  3. Closed: Re: sampling rate vs rate of change of input for control system

    That doesn't make sense.
    rps is a velocity, not a change in velocity.
    Do you mean 100rps/s change?
    How fast does the velocity change and what speed of correction you need?
    Also what are you...
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    Closed: Re: Digital De-emphais Error

    Sorry but there's way too little info to answer your question.
  5. Closed: Re: shunt 24V rail to reference voltage using opamp?

    An apparent problem is that the negative feedback loop has no compensation for the added loop gain from the transistor.
    That can lead to an unstable output.

    How is the 200mA bus current limit...
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    Closed: Re: Using AD627 with gain > 1000

    That's why gain is distributed over more than one stage since, with lower stage gain, the bandwidth of each stage can be higher.
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    Closed: Re: Using AD627 with gain > 1000

    Try it at the gain you want and see what happens.

    Alternately why not just add a rail-rail op amp gain stage at the output of the AD627?
  8. Closed: Re: switching a resistor into circuit using mosfet

    R8 and R9 are way too low in value as each resistor will be dissipating 10 watts.
    Change then to something like 10k ohms.
    If you want to determine the power dissipated in a device after a...
  9. Closed: Re: Passing both DC and pulses through a toroid?

    If you apply an ideal DC voltage source, that source has zero impedance, so any pulse applied at a different winding will be absorbed by the source, since it's effectively an AC short.

    If you want...
  10. [SOLVED]Closed: Re: Rookie making an audio step-up transformer

    Winding you own transformer is a difficult task.
    Why not just buy a small audio transformer, such as one of these?
    The small ones are only a few dollars.
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    Closed: Re: ADC input with low pass RC filter

    You say ADC and then you mention PWM, which is DAC.
    Which are you really trying to do?

    It it's PWM DAC, what is the highest modulation frequency of the PWM?
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    Closed: Re: Buffer Circuit Question

    Exactly what are the input and output voltages that show this offset?
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    Closed: Re: Photocoupler Saturation?

    For that I think you will have to go with a faster opto, such as the one in post #5.
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    Closed: Re: Photocoupler Saturation?

    If lowering the load resistor value still does not give a fast enough response, you may have to use a faster opto such as a 6N136 (LTspice simulation below).

    155983

    How fast a response do you...
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    Closed: Re: low voltage indicator

    Below is the LTspice simulation of a circuit that should work for you.
    It uses a TLV431 low-power programmable reference (about U$0.60) as a comparator with a built in 1.25V reference voltage.
    The...
  16. Closed: Re: Active Precision Current Limiting circuit needed

    Yes.
    Below is a graph from the AL5809 data sheet showing current vs. voltage across it.
    It reaches the 100mA limit at a little below 2V.

    155836
  17. Closed: Re: Active Precision Current Limiting circuit needed

    Yes, that is true.
  18. Closed: Re: Active Precision Current Limiting circuit needed

    How about the AL5809?
    It's inexpensive, requires no extra parts, and can be purchase with a 100mA rating.
    The data sheet show in operating down to about 2V across it.

    Below is a discrete circuit...
  19. Closed: Re: Is a tantulum different from a microfarad tantulum cap?

    Tantalum is a type of electrolytic capacitor.
    Microfarad is 1 millionth of a farad, which states the charge storage capacity of the capacitor.
  20. Closed: Re: Active Precision Current Limiting circuit needed

    What is the load resistance range?
    What is the minimum supply voltage?
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    Closed: Re: NMOSFET On high side?

    How much current?
    If it's significantly more than the spec sheet value, then I suspect the gate-source voltage is not really zero.
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    Closed: Re: NMOSFET On high side?

    The cost of those items is quite low, so I don't see how that makes it "expensive"?
    Normal leakage current is usually negligible, but if you are worried about a pathological case, then the answer to...
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    Closed: Re: Adding an offset voltage to a signal

    Here's a single supply, single op amp circuit that adds the offset.

    How do you plan on generating the 1.2V?

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    Closed: Re: NMOSFET On high side?

    If you don't have that voltage available then you can easily generate it from the higher MOSFET voltage using a resistor and a 15V zener along with a filter cap.
    The circuit only requires 100uA at...
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    Closed: Re: NMOSFET On high side?

    Here's the LTspice simulation of a discrete bootstrap high-side driver that requires no additional voltage supply.

    155218
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