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Type: Posts; User: barry

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  1. Closed: Re: looking for a local supply in southern california

    I donít know why youíre having so much trouble. Hereís one solution; there are others. https://www.digikey.com/product-detail/en/bel-power-solutions/HB12-1-7-AG/179-2311-ND/1634203
  2. Closed: Re: looking for a local supply in southern california

    Use the power of your mighty internet browser. Try searching for "power supplies". You'll be AMAZED!!!
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    Closed: Re: Use physical button to trigger an IR sensor

    Stupid question, maybe: Why mess around with the sensor side of things, why don't you just modify the output circuit to be controlled by the switch? And what do you mean 'it transmits a 1'? Is it a...
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    Closed: Re: HUM in transmitter PSU

    Don’t confuse mains ground with the negative supply terminal; they’re generally isolated.it’s the negative terminal(common) that needs attention.
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    Closed: Re: Programming Chips in Parallel

    I would be a little concerned about capacitance. What speed are your signals? Driving into the RC formed by your 1Ks might be a problem. Also, verify that your uC can drive a 3K load.
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    Closed: Re: HUM in transmitter PSU

    Yes, but there's also that problematic white protoboard, and another board in the background; are those part of the system?
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    Closed: Re: HUM in transmitter PSU

    Aside from the fact that it looks like your transmitter is having a seizure (what was the point of that??), it also looks like you're using a protoboard with wires flying all over the place. That is...
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    Closed: Re: How to build sample and hold circuit?

    Good answer, but to a different question. Op was asking for buffer, not switch circuit.
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    Closed: Re: How to build sample and hold circuit?

    Yes, a common-collector(emitter follower) would work since it has a high input impedance. But there are better solutions: mosfet, opamp. Show us a circuit.
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    Closed: Re: Frequency characteristics of op amp

    Ok, I plotted gain. It STILL doesn't look like the OP's plot. Or the "ideal" plot. But, here's the problem: OP has defined the sine source with a 2 Volt offset, it should be zero. This seems like a...
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    Closed: Re: Frequency characteristics of op amp

    The plot came from the simulation. I'm too lazy to actually do the analysis by hand. How do you know it should be gain of 2, other than from the initial (suspcicious) plot?
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    Closed: Re: Frequency characteristics of op amp

    Your plot doesn't look right. What point are you plotting? You should be plotting the output. It should look like this:
    159218
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    Closed: Re: Frequency characteristics of op amp

    Why would you think that changing external stimulus would change the response of your circuit? It’s a sine wave, right? How do you know the components are selected correctly? First of all, it looks...
  14. Closed: Re: What LDO (Low Voltage Regulator) do you have?

    The dropout voltage has nothing to do with power dissipation. The Input/output voltage differential determines the power. The dropout voltage is simply the MINIMUM differential the device will...
  15. Closed: Re: What LDO (Low Voltage Regulator) do you have?

    There’s no one LDO that works for everything. The reason they make so many kinds is there are many different requirements.
  16. Closed: Re: Verilog code for ring counter using "Genvar"

    I think your problem is your statement
    q_n[N-1] in the generate block.

    N is a constant, but it wants to be a variable.
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    Closed: Re: Artix7 XC7A100T BRAM Math

    The XC7A100T has 270 18Kb blocks, that's 4976640 bits. I don't know where you got 2211840 bits.
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    Closed: Re: Artix7 XC7A100T BRAM Math

    How do you actually know you are saving anything?

    Also, you Can look at the utilization reports which will show exactly how much memory is used.
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    Closed: Re: Replacing relay to trigger a device input

    1. What’s the point of R5?
    2. The absence of the 360 ohm does NOT explain why you’d see 12V.
    3. When D0 is pulled low 6 ma will flow through the opto. That should enough to turn it on. You’re not...
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    Closed: Re: Replacing relay to trigger a device input

    This still makes no sense. Think about it. Your external transistor canít drive low with a small load, but if you increase the load (external resistor) then it can. Transistors just donít work that...
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    Closed: Re: Replacing relay to trigger a device input

    Why doesnít A work? Are you driving the external optocoupler hard enough? Does the optocoupler sink enough current to turn on the internal led? you donít provide any part numbers or specs...
    ...
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    [SOLVED]Closed: Re: Impedance matching for High input amps

    Yes. That's done all the time.
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    [SOLVED]Closed: Re: Impedance matching for High input amps

    Impedance mismatch=reflections. Why donít you just put a 50 ohm termination at the input to the opamp?

    Wait, I just noticed you DO have a termination. Just put it close to the opamp input.
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    Closed: Re: Altium Designer problem in safe-mode

    You can’t really expect to run a graphics-intensive program like Altium in safe mode. It requires a lot of resources.
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    [SOLVED]Closed: Re: Op amp integrator formula

    I think youíre getting your brain tied in a knot. The upper bound for your integration is whatever you want it to be, it has NOTHING to do with the signal, v(t). If your signal is a square wave, that...
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