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  1. AnalogKid

    amp?

    No big risk. Both specs are slightly padded, so it probably will work. If it can't handle the startup (inrush) current, it will shut down to protect itself. Try it with you hand on the cord ready to yank it. ak
  2. AnalogKid

    How Radio wave are generated in FM?

    Why? What is it you want to do?
  3. AnalogKid

    Low power distance detection

    No, it doesn't. GPS requires reception of independent signals from at least *three* atomic clocks, plus a butt-load of computation. Since the receiver does not have a reference, the only thing it can do with a single signal is tell you the time of day. It takes the triangulation of three...
  4. AnalogKid

    Low power distance detection

    At 300 MHz, one cycle is 3 ns. The time it takes for chips to decode a number and compare it to anything will be what, 100 times that - and not constant - only if it is all done in random logic (no processor). I suppose you could take a snapshot of the local counter and external signal and...
  5. AnalogKid

    Hdd Switch

    Each drive has a power profile. You can set the ones you don't use often to turn off after xx minutes of inactivity. ak
  6. AnalogKid

    Hdd Switch

    How old are the drive and the computer? ak
  7. AnalogKid

    5v from 12v is this viable?

    85K is an equivalent USB load of 60 uA. That is so low that you don't really need a pass transistor. Decrease R4 to 1K. Decrease D1 to 5.1 V. Delete Q1. Take the 5 V output from the D1 anode. Keep C7. Add 0.1uF in parallel with C7. ak
  8. AnalogKid

    Resistor

    Do some research to find the approximate internal resistance values and peak output currents for your batteries. If you attach an external resistor equal to the internal ESR (equivalent series resistance), the measured output voltage should decrease by 50% (Ohm's Law). For other rations of...
  9. AnalogKid

    Computer ATX PowerSupply to Lab Bench power supply

    ATX supplies make such high power at such low cost that using them outside their narrowly-defined application is risky. IO!, them puppies be weird, and no two are alike. Your model might require a minimum load on more than one output to stabilize the magnetics, particularly when handling a...
  10. AnalogKid

    Help about schematic diagram of relay project

    Your English is not a problem. The problem is that you won't give us any information to work with, photos of your components, or anything useful. ak
  11. AnalogKid

    Why don't I get a Sine wave?

    FINALLY!! I take back half the things I've said about you. ak
  12. AnalogKid

    7S125 behaviour when the enable changes slowly

    Please post a datasheet of the part, and post your schematic. ak
  13. AnalogKid

    newbie trying to make a basic monitoring circuit

    First pass, rushed, maybe errors. Note that the components are what's in my design libraries. There is no need for a 0.1% R or a 50 V C. I show three different output options. ak
  14. AnalogKid

    newbie trying to make a basic monitoring circuit

    Your approach is a classic in alarm sensor loops, detecting both an open and short circuit with what is called a window comparator. 100 ohms is unnecessarily low, doing nothing but discharging the battery more quickly. I recommend 1K as the loop resistor. The circuit uses two voltage...
  15. AnalogKid

    Why don't I get a Sine wave?

    I don't think you got my point. Your explanation is fine, except that the OP might not know what an array is, what a byte is (from a programming point of view) what an element is, what those brackets mean, what an unsigned integer is, what an I/O "port" is, or what C, C++, assembler, basic...
  16. AnalogKid

    electronic schedule of a 4 bits adder

    Addition is commutative: 2 + 5 is the same as 5 + 2, so only one of those two cases needs to be in the table. When you eliminate all of the other "duplicates" from the 256-length table, there are only 32 left. Another way to figure this is that 16 + 16 = 32, so that is the maximum number of...
  17. AnalogKid

    Why don't I get a Sine wave?

    Can ***anyone*** post the original circuit? mod: see here for the (fixed) circuit.
  18. AnalogKid

    Why don't I get a Sine wave?

    Pretty much by definition, all arbitrary waveform generators are DAC based. But I don't think the most complicated signal source topology in the world is a good path for someone who is "pretty new at this." Also, I don't think relative or indexed addressing is "easy as pie" for someone who has...
  19. AnalogKid

    Why don't I get a Sine wave?

    Still don't see it. When I right clock on it to View Image, I get a message saying the URL signature expired. ak
  20. AnalogKid

    Why don't I get a Sine wave?

    I don't think: goes well with DSP code. I have uCs also, use them often, and in fact the majority of the circuits I post are digital rather than analog in nature. I am handicapped in that the OP's image in post #1 won't load, so I'm a bit blind as to what his starting point is, but rarely...
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