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Type: Posts; User: barry

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  1. Closed: Re: how to design a thermostat without Microcontroller?

    I pretty much disagree with most of this.

    1) C1 should just be replaced with a 0.1.

    2) LM35 does not like to drive a capacitive load (I assume that's what U1 is); eliminate C3 altogether.

    4)...
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    Closed: Re: Problem with my echo circuit using PT2399

    It’s not really clear from your description what you’re doing, but my guess is that you have a phasing issue. For example, when you’ve got stereo speakers hooked up “out of phase”, in other words,...
  3. Closed: Re: how to design a thermostat without Microcontroller?

    I STILL don’t see any decoupling caps. Probably a third of the posts here tell you to add caps on the opamp power rails, and you keep not doing it.

    Another thing to look at is ground routing. You...
  4. Closed: Re: Questions about a circuit interfacing a DC fan via open drain way

    You REALLY need to settle down and READ THE DATA SHEETS. The fan PWM input draws a maximum of 1mA. The only way you're going to exceed that is by applying WAY too much voltage.

    There are much...
  5. Closed: Re: Questions about a circuit interfacing a DC fan via open drain way

    Ah, look at that. RTFM.
  6. Closed: Re: Questions about a circuit interfacing a DC fan via open drain way

    No, no and no.

    Those diodes are for overvoltage protection; they will do NOTHING for reverse polarity. If the input voltage goes above 5V, U2 (which is a terrible ref. des. for a diode; use D*)...
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    Closed: Re: Switched mode power supply

    Because you said the scope was AC coupled.
  8. Closed: Re: Questions about a circuit interfacing a DC fan via open drain way

    Many questions...
    Why do you think you need an opamp for "protection"? Won't the diodes work without the opamp?
    What is the output voltage of theArduino? Can you drive the NFet directly?

    On...
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    Closed: Re: ELECTRICAL AND ELECTRONICS Instrumentation

    Stupid question or trick question. Is there a rectifier in your meter? Does it have an AC range? If not, the answer is 5. If so, the answer is 11.1.
  10. Closed: Re: PIC microcontroller debugging- dspic33ch128mp508

    Agree with Andre. It looks like you’ve explicitly disabled JTAG.
  11. Closed: Re: Does my power converter have the correct voltages?

    It's not totally clear; are you saying you've got a device to convert 220 VAC to 100VAC, i.e., a transformer? If so it should work, but not with much margin: your console needs 47W; your converter...
  12. Closed: Re: how to design a thermostat without Microcontroller?

    People have already told you where to connect the capacitors. Several times. They have also suggested values (although the values are not that important). My previous post also told you how to adjust...
  13. Closed: Re: how to design a thermostat without Microcontroller?

    There's a 1K and 2.2M resistor on the comparator (R3, R4) THAT'S the hysteresis. But maybe increasing R3 would help (more hysteresis).

    You might want to use a faster diode for D1, like a 1n4148....
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    [SOLVED]Closed: Re: copy Altium file.GM1 to Autocad

    File/export
  15. Closed: Re: Amplifier with 50khz frequency and 1 A output

    Is this a real circuit or simulation? What do you mean “dc power supply to transistor can’t be reached above 6v”? Do you mean your 10V supply only puts out 6 volts?
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    [SOLVED]Closed: Re: What logic gate is this?

    Well, what DO you know? Do you know how a transistor works? If not, perhaps you should learn about that first.
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    [SOLVED]Closed: Re: What logic gate is this?

    It looks to me like it's a weird inverter. But it also looks like a circuit designed to destroy a transistor, because 5V reverse bias B-E is not good idea.

    Why don't you try writing a truth table?...
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    Closed: Re: vivado post route simulation problem

    There's nothing intrinsically wrong with doing this. It's not necessarily a good idea if you actually HAVE some constraints, i.e., minimum frequency, but it has nothing to do with signal visibility....
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    Closed: Re: Applications I can work On

    1) Motorized toilet seat-lowerer, so your wife won’t yell at you for leaving the seat up.
    2) motorized dog head-scratcher, for when you’re just too tired.
    3) motorized book page-turner, so you...
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    Closed: Re: I/O banks in an FPGA. Is it important for routing?

    It depends on the device; the user’s manual should tell you if you can use the p and n ports individually. Barring that, the mapping tool will certainly tell you by throwing an error. But my guess is...
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    Closed: Re: I/O banks in an FPGA. Is it important for routing?

    It shouldn’t matter as long as the voltages and IO standard are correct.
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    Closed: Re: vivado post route simulation problem

    Timing constraints have nothing to do with the visibility of signals in simulation.
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    Closed: Re: Gerber File viewer and checking CAM

    A Gerber viewer does not check anything other than dimensions. It won’t do signal integrity testing. A gerber viewer doesn’t know anything about speed or impedances.
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    Closed: Re: Altium design information

    Whats your problem? Place text, place lines....
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    Closed: Re: Critical path while using xilinx ise

    Your timing report should identify your slowest path.
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