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Type: Posts; User: asdf44

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  1. Closed: Re: how two nodes are communicating in CAN bus protocol?

    No I believe in this regard CAN is like I2C (also multi-master). Any node can be a master and to initiate a transaction it broadcasts the ID of the node it wants to talk too where the ID also...
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    Closed: Re: Identify an electronic component

    My guess: Voltage Regulator
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    Closed: Re: Implementation of ADC

    You'll find a handful of tricks for using digital FPGA pins as an ADC. For example an LVDS input is basically a comparator. If your FPGA has that as an option you can compare an unknown input to a...
  4. Closed: Re: Simple question on Transresistance Amplifier circuit

    Yes I think Klauss described it well.

    The light provides energy so inside the diode there is a source that does produce voltage. That source is then shorted out by the opamp circuit and the...
  5. Closed: Re: Why are SMD components so much smaller than their THT versions?

    Well don't be fooled by mosfet ratings.

    When it comes to heat dissipation size matters. Even with the same "200A" die you'll be able to push more power from a bigger package.

    You need to...
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    Closed: Re: Instrumentation AMP Virtual short.

    Right, no virtual ground for an inst amp.

    They act as a fixed differential in to differential out gain block with high input impedance.

    This inst amp defaults to gain of 1 which can be...
  7. Closed: Re: multiple channel "DC OK" signal ANDing with galvanic isolation

    You could do that.

    But Much better (cheaper/smaller) to AND all the signals with a couple multi-input compact gates and then send the result through a single opto.
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    Closed: Re: using a power inverter in a car

    Not really. The 14-15V is being regulated by the alternator and it isn't going to like it's output being 'shorted' to 12V across a zener. Plus the zener will melt.

    I think you have a...
  9. Closed: Re: Detect the absence of sampled AC signal (from digital filter) in verilog

    I wouldn't look at zero crossings because there will still be noise, perhaps AC mains pickup, when no signal is present. I've done this:

    AC Signal -> First order IIR low pass -> Absolute value ->...
  10. Closed: Re: Get phase precisely through longer sampling time

    Yes it's basically just averaging. All samples have noise. If you make a decision with a few samples it will be more likely wrong than making a decision with many samples.

    In my experience...
  11. Closed: Re: What is the future of Boolean algebra-based languages and methodologies?

    C to gates has happened its just not good yet. I prototyped a PID controller in C and it was super quick to get the basic algorithm running. The problem is that you're still on the hook for...
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    Closed: Re: Bridge diode thermal problem

    Don't use a 1000V rectifier for 20V...

    Schottky's should work well at these voltages.
  13. Closed: Re: Supply 5V, 5mA from the 240VAC mains without SMPS

    Add these lines to standard.mos (probably in C:\Users\youruser\Documents\LTspiceXVII\lib\cmp) to add these to your fet library.



    .MODEL DN2540 NMOS (LEVEL=3 RS=1.05 NSUB=5.0E14 DELTA=0.1...
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    Closed: Re: default statement in case

    Correct in general. Though you show two different things in your example: defaulting to state versus idle.
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    Closed: Re: PCB flexion and cracking of SMD capacitors

    Yes size makes a big difference. I've been told by sales reps to stay 1206 and below when possible.

    We've had big problems with 18XX and larger ceramics failing. None with anything smaller.
    ...
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    Closed: Re: PCB flexion and cracking of SMD capacitors

    See figure 8 in this document discusses exactly this:
    https://www.digikey.com/Site/Global/Layouts/DownloadPdf.ashx?pdfUrl=9A23B3687C14472482403C3540CC7267

    Flexing the long way is the worst

    In...
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    Closed: Re: Limit Current Maintain Voltage PSU output

    Impossible.

    Voltage and current go hand in hand.

    To control one you have to modulate the other.

    Voltage sources regulate voltage by modulating current.

    Current sources regulate current by...
  18. Closed: Re: How to find if a simple regulator is oscillating

    Ok fair enough. I'm probably recalling the small lower voltage variants I typically use.
  19. Closed: Re: Supply 5V, 5mA from the 240VAC mains without SMPS

    155889

    (For some reason I love these high voltage linear circuits...)

    Here they are with a higher current mosfet and the current limiting resistor R7/R8 which creates a Vgsoff/R8 upper current...
  20. Closed: Re: How to find if a simple regulator is oscillating

    Besides instability I wonder about its general configuration.

    The circuit is set for 5Vout but with 150ohms in R9 it can only tolerate 8Vin (at C1) before risk of hitting the 20mA limit TL431...
  21. Closed: Re: Supply 5V, 5mA from the 240VAC mains without SMPS

    Fusing element to prevent single point failure works in these circuits as well as any other.
  22. Closed: Re: Modelling UC3842 current mode PWM Controller

    PSIM has a model of UCC3842 as well though you'd probably need to pay either to get it or to get much use from it (Though if you have a budget I highly recommend PSIM).

    If LT1243 is compatible...
  23. Closed: Re: Supply 5V, 5mA from the 240VAC mains without SMPS

    If you're not doing cap dropper then....depletion.


    155874


    This shows the simple zener and a TL431 high voltage regulator topology. I've used both of these. Again the advantage is no high...
  24. Closed: Re: Active Precision Current Limiting circuit needed

    To be specific I think it means that it isn't guaranteed to deliver the specified current until it has the required voltage.

    At lower voltages it will almost certainly limit to lower currents.
    ...
  25. Closed: Re: Overdrive voltage relationship to the op-amp speed

    Presumably the open loop gain vs frequency plots contain all the information.

    If you want the opamp output to be X volts you need the inputs to be X/gain. In short periods of time bandwidth...
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