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Type: Posts; User: barry

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    Closed: Re: Calculate impedance in circuit of an OPAmp

    Boy, you didn’t even ATTEMPT to hide the fact that you’re asking us to do your homework. Take your F, and then go find another career.
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    Closed: Re: Impedance calculation in CMOS circuit

    Impedance is the reciprocal of transconductance.
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    Closed: Re: Recommendations for Beginner

    First of all, I would highly recommend NOT trying to do USB for a first FPGA project. There's a LOT under the surface of USB. Unless you can find a drop-in core (and even that will give you...
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    Closed: Re: Zener Diode with LC circuit

    Um, where’s the zener? This is making less and less sense. If you actually did have a zener in parallel with the LC, it would just conduct unlimited current when the input voltage exceeds the zener...
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    Closed: Re: Zener Diode with LC circuit

    It’s not clear what you’re asking for. I have no idea what you mean by “an LC circuit with the reverse-biased...” could you maybe draw a schematic or describe what you are trying to do? How do you...
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    Closed: Re: Troubleshooting Circuit card

    Voltmeter. Oscilloscope. Logic analyzer. No software is going to be able to identify a hardware problem, particularly if you don't want to use JTAG.
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    Closed: Re: Quartus error 12006 'undefined entity'

    Sorry, Cyclone IV. See, I told you I was a Xilinx guy.
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    Closed: Re: Quartus error 12006 'undefined entity'

    Aha! Thanks.

    I'm a Xilinx guy. I searched a lot for any mention in the Intel docs, but didn't find much about clock buffers, but they did let me create one anyway. My whole problem stemmed from...
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    Closed: Re: Quartus error 12006 'undefined entity'

    It's a spartan 4. The buffer outputs go to the fabric, the inputs go to top level ports.
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    [SOLVED]Closed: Re: Question about MC33063

    What is your input voltage? I think your inductor might be too small. Looking at the data sheet, they're using values of 170-220 uH. How did you "choose" that 10uH value?

    (And I assume you meant...
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    Closed: Quartus error 12006 'undefined entity'

    I'm using Quartus Prime Lite and generated a clock buffer IP (using ALTIOBUF). It synthesizes fine in Synplify Pro, but when I try to compile the netlist, Quartus gives the error: "Error (12006):...
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    Closed: Re: OP-Amp Circuit Design

    Stupid assignment, IMO.

    You could just cascade several high gain rail-to-rail opamps, open-loop, connect the power supply to 3V, and VOILA! always 3V out for all positive inputs.
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    Closed: Re: Two 10bit ADC microcontroller

    Noise from the motors getting into your arduino? Software bug? You give us NOTHING to help you with.
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    Closed: Re: Two 10bit ADC microcontroller

    Please do a google search yourself. There are HUNDREDS of microcontrollers that have multiple ADCs. You don't give any other requirements. And you do know that you don’t need an ADC to run a stepper...
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    Closed: Re: Heart beat monitor by PIC16f877a

    Whaaaaaat? You give us absolutely NO information about your hardware or software, and then you ask us to give you ”code to read a microcontroller?”

    Do some work on your own, and then maybe someone...
  16. Closed: Re: Microcontroller pin not working after some time.

    ESD? Over-temperature?
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    [SOLVED]Closed: Re: VHDL Simulation error using Xilinx ISE14.7

    And that's why your simulation fails?
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    [SOLVED]Closed: Re: VHDL Simulation error using Xilinx ISE14.7

    VHDL does not have a data type of "word". Is this defined in your package, which you haven't shown us?
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    Closed: Re: Addressable speaker system

    First of all, putting a diode from input to output will probably make the whole thing fail, and certainly won’t solve any problem. Why didn’t your multi drop configuration work? Was it terminated...
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    Closed: Re: ZYNQ Power Requirement

    Do you mean VOLTAGE requirement? Or, do you really mean POWER? The voltage is specified by VCCO; it's in the data sheet. It depends on what your selected IO is: LVDS, LVCMOS, etc.

    If you want to...
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    Closed: Re: Addressable speaker system

    Three votes for UART. If you're going to use a microcontroller, you might as well use a UART. It will be a lot more reliable.
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    Closed: Re: Addressable speaker system

    So you have to continuously send a pulse train of 1ms /2ms etc. period to keep the speaker enabled? First of all, that's not PWM, that's simply a train of pulses. If it works, I can't argue with it,...
  23. Closed: Re: Configuring ICE40 FPGA directly from ESP32 uC rather than using dedicated flash I

    Yes, you can use the SPI ports for your own nefarious needs after configuration. Just pay attention to what's attached to those ports.
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    Closed: Re: Addressable speaker system

    If you design it properly, “it will work fine”. Long duration pulses? Low noise environment?

    But why PWM, Why not a single pulse of a specific duration? Why a whole microcontroller when you could...
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    Closed: Re: GND For Connector Shielding

    You’ve got three different grounds shown there, that’s a little confusing. Where do they all go? Where do the shield connections of each connector actually go besides ground?
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