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Type: Posts; User: andre_teprom

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  1. Replies
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    Closed: Re: Tip41c/42c arrangement problem

    I would start by answering the questions:



    There are variants of the 555, some of them (actually, few manufacturers) with limited supply voltage, slightly below what would be expected from a...
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    Closed: Re: Tip41c/42c arrangement problem

    Me too, so review the above messy assembly, or better, get rid of that and make another one few more carefully. You are wasting your and others time with something notoriously prone of giving...
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    Closed: Re: pulse width stretching

    @iaf,

    Your argueness in learning is admirable, but you should have already realized given elapsed almost half houndred replies that forums are not the appropriate place to learn the fundamentals...
  4. Closed: Re: About 30 minutes limit for editing posts

    Hopefully all you will agree to this, I moved these posts to a specific thread; the subject deserves such a treatment not to be forgotten.
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    Closed: Re: Shortcircuit protection circuit

    Just to add my 2 cents.

    I recently used an integrated circuit for either detection of disconnected load or overload by using the MAX4375 (also available at Digikey), which is essentially a circuit...
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    Closed: Re: pulse width stretching

    Whenever you read ST (Schmitt trigger), it refers exclusively to the input stage; which is a voltage range at inputs logic that do not submit any change to the output stage, a kind of noise filter to...
  7. Closed: Re: heat shrink tubing over heat shrink tubing

    I did it with both, I used the shrinking pipe just for finishing purpose in an application let's say more professional, once the pasty tape has an ugly look after it's cure, but if you heat the pipe...
  8. Closed: Re: heat shrink tubing over heat shrink tubing

    If you ensure that the surface of the solder is smooth, I see no problem in using this tube as an insulator, but rather exaggeration, I would put more than one. By the way, except for hobby, in jobs...
  9. Closed: Re: heat shrink tubing over heat shrink tubing

    In general a quick hot airflow is sufficient for shinking the pipe not affecting so much what is inside. Anyway, I do not feel confortable on using it as the isolator, particularly in your case,...
  10. Closed: Re: Power consumption calculations including efficiency

    Perhaps just a typo of yours, but the corretc value is without the decimal dot:

    DCDC converter efficiency 90%, 62/0.9 Input Power = 68w


    I did not check anything else after this point, the...
  11. Closed: Re: Using 0-10V analog sensor output with rasbery pi

    The simple mention of 4-20mA sensors suggests the action of remote measurement, which by itself would be a strong argument for using galvanic isolation, such as analogue optical couplers....
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    Closed: Re: pulse width stretching

    Would I be wrong in assuming that you are on the scope of a programmable logic circuit design? In this case, it would make little sense to implement this circuit with an analog approach.
  13. Closed: Re: Audio amplifier on PCB error. Ports of opAmp shorted.Can't find the reason why?

    Whenever doing analog simulations it is appropriate to perform a Monte Carlo analysis, or something similar such as adding variation in the circuit parameters, such as a Hfe's discrepanciy. BTW, for...
  14. Closed: Re: Simple Power Supply with Noise Problems

    Even for 600Vdc, 1MΩ is almost no load in the context of a power supply (360mW) for that magnitude. Add something not greater than 10KΩ at the output stage, or even smaller; this would make waveforms...
  15. Closed: Re: Altium Nexus 2.012: generating better searchable PDFs?

    I'm unfamiliar with Altium Nexus, the only I have used is Altium Designer, which has the Smart PDF Wizard tool (File»Smart PDF) with which you can setup PDF output to let either Nets and Designators...
  16. Closed: Re: Simple Power Supply with Noise Problems

    It seems a perfectly plausible artifact considering the presence of inductors and capacitors at the output stage performing a tank circuit capable of sustaining an oscillation during the recharge of...
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    Closed: Re: Chossing MOsfet for boost converter

    Switching devices placed in parallel, particularly if not belonging to the same manufacturing lot, it is expected to have discrepancies even though within the specified range, which means that it is...
  18. Closed: Re: Speakers make a loud noise when turning off. Is there a way I can eliminate it?

    It is necessary to have the circuit diagram of the equipment; perhaps others here can have some general insightful tip to overcome this problem, but at least for me, I don't know how to do another...
  19. Closed: Re: Speakers make a loud noise when turning off. Is there a way I can eliminate it?

    Does this happens even when the audio volume knob is set to the minimum level? If yes, once it has in built amplifier, without knowing anything about its circuitry, there is no much to do.
  20. Closed: Re: Send data periodically as a server to my client in arduino ESP8226

    You should have mentioned this from the 1st post. From what you have presented it did not appear to be the same program, since you implemented both Client and Server in the Arduino code.
  21. Closed: Re: Altium "Align to Grid" command not moving all components

    I may be wrong, but the use of footprints slightly larger than the expected numeric error may be sufficient to deal with this scale conversion. Most automatic pick and place machines, even the...
  22. Closed: Re: Using a potentiometer to measure arcseconds.

    Just remembering that you would actually need 2 of these sets of motor+encoder to provide the desired position, one for the vertical incline, and another for the cardinal direction on the horizontal...
  23. Closed: Re: Using a potentiometer to measure arcseconds.

    I do not have any experience with telescopy, but if I were to implement the angular control, this would not be properly by measuring the angle of inclination with rotational encoders from the center...
  24. Closed: Re: Send data periodically as a server to my client in arduino ESP8226

    From what you said, you are seemingly running the server in your laptop (first code above) and a client at the ESP8266 (second code above), not the usual approach. Anyway, at the server side, you are...
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    Closed: Re: Question about my matlab code

    Try being more clear; "don't work" means, wrong values other than expected, or runtime error ?
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