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  1. AnalogKid

    Problems with touch captive sensor

    Your post has no information and no question. Please try again. Because of what you are asking, you must post a schematic so we can see your circuit. ak
  2. AnalogKid

    Automatic switching on of arduino with two different sources using mosfets

    Measure or calculate the peak current drawn by the embedded system, and use that to calculate the value of a hold-up capacitor that goes between the cathode of the diode and the power input to the embedded system. To do this you need to know the lowest acceptable input voltage for the embedded...
  3. AnalogKid

    Voltage regulator or not?

    12 V supply: Make Model Number Part Number Photo of the nameplate / sticker/ whatever Link to manufacturer or vendor anything - ? ak
  4. AnalogKid

    DC/DC Converter

    Why?
  5. AnalogKid

    FSM - Can someone help me to solve this?

    Anything can be done with logic gates and state machines if you are patient and careful. As this is homework, you don't get free answers, but here is some guidance ... Because there are so many differences between day mode and night mode, and day mode is an internal component of night mode...
  6. AnalogKid

    DC/DC Converter

    You need to use a different chip. The part you have limit the total power to 2.5 W, but the load at 1.2 V is 3.6 W, and that does not include the loss in conversion efficiency, typically 20%. Select a part rated for at least 1 A switch current. For better long-term reliability, the chip...
  7. AnalogKid

    Help designing a circuit

    It sounds like what you want is an analog switch or transmission gate. These are electronic components that require a power source to operate. Another option is low-power relay. ak
  8. AnalogKid

    Help designing a circuit

    1. What do you mean by "variable signal"? 2. Which signals are digital and which signals are analog? 3. the leftmost image has an unlabeled input. 4. Is the output signal analog, digital, exactly equal to the "variable signal", or something else? ak
  9. AnalogKid

    need help for my circuit

    Rather than have us guess, why don't you tell us: What is the purpose of Q1 and Q3 in your circuit? ak
  10. AnalogKid

    need help for my circuit

    You are correct about reducing component values to make the circuit oscillate faster. But not yet. The circuit has several problems. Please add a reference designator to each component and re-post so we can discuss how they work. A reference designator is a unique label for each part. For...
  11. AnalogKid

    I want to design a single led to be powered by 4 garden-sized solar cells

    To be clear, I wasn't saying it is a bad idea, just so expensive that not-enough people would to pay for it. IMO Cruise around the Linear Technology and Maxim sites. They both make battery management chips that do not need micro's. Linear Tech and National make lotsa low voltage, low current...
  12. AnalogKid

    I want to design a single led to be powered by 4 garden-sized solar cells

    Three thoughts. First. It is better if there is an individual resistor in series with each LED. Ultra-low cost products such as flashlights don't care about mismatches in Vf, but your circuit can have a problem if one LED fails open. The "right" way is to have all of each LEDs current...
  13. AnalogKid

    I want to design a single led to be powered by 4 garden-sized solar cells

    With nothing connected to it except an ohmmeter, measure the CdS cell resistance out on the porch at the ambient brightness level that you want to turn on the LEDs. ak
  14. AnalogKid

    I want to design a single led to be powered by 4 garden-sized solar cells

    Easy: Waaaaayyyyy too expensive. Also, excellent data collection and reporting. Please post your circuit. There probably is a way to reduce the 150 uA daytime current. ak
  15. AnalogKid

    Networks Of Multivibrators

    Harold - excellent find. But . . . Not to be picky or anything, but this is from the link in post #16: "the fact that monostable multivibrators are implementable in large quantities as counters in digital programmable hardware" No. Not a fact; in fact, a significant error. In the real...
  16. AnalogKid

    Networks Of Multivibrators

    Not really. There is a CMOS version with the same pinout, and a couple of 5-pin SMT versions that can be either astable or monostable, but not both. There probably are other variants for high-volume use; the 555 was not patented, so things happen. But the old bipolar and CMOS versions still...
  17. AnalogKid

    Networks Of Multivibrators

    To Do What ?
  18. AnalogKid

    Networks Of Multivibrators

    In what context? What do you mean by "network"? ak
  19. AnalogKid

    Transistor switch time

    If you look at the graph, you will see in the upper left corner the conditions for the plots: the ratio of the collector current to the base current is 10. At larger ratios, such as 100, the transistor will be much slower. Also . . . VERY approx. A transistor's beta is nothing near constant...
  20. AnalogKid

    Function of capacitors in Royer oscillator

    Looks a bit like a TV flyback transformer. ak
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