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  1. AnalogKid

    555 circuit to open/close car door window

    Does not sound difficult. But . . . To design a drop-in replacement, it is kinda important to see what you are dropping into. Please post a schematic / sketch / cocktail napkin of your complete circuit as it is now. Power connections, transistors, switches, motors, a block for the Arduino -...
  2. AnalogKid

    Basic circuit, but is this possible??

    Without simulating or prototyping anything, yes, I *think* it can be done. But the tradeoffs of LED on-time versus brightness versus capacitor size might yield unsatisfactory results.
  3. AnalogKid

    Basic circuit, but is this possible??

    An R-C network on the CMOS 555 Reset input will cause it not to oscillate for 15 seconds. After that, a separate R-C network sets the flash rate. These low-voltage 555 output stages can sink way more current than they can source, which is unfortunate for you because the Reset state has the...
  4. AnalogKid

    Basic circuit, but is this possible??

    No trolling (or scrolling) expressed or implied. All 50 items have a minimum operating voltage of 3.0 V or less, as indicated in the Voltage-Supply search parameter and the Voltage-Supply column in the results table. We know nothing about the OP's preference for DIP or SMT parts, budget...
  5. AnalogKid

    Basic circuit, but is this possible??

    TI has variations of the 555 that are rated for operation down to 1.0 V...
  6. AnalogKid

    Basic circuit, but is this possible??

    Yes this is possible. The big unknown is the light. Assuming it is an LED, we need the part number and datasheet. Next, determine how bright you want the LED to be. This (plus the datasheet) tells us how much current it needs. Next, tell us how long you want the LED to light. With this we...
  7. AnalogKid

    Powering a 5v led strip with batteries

    The board clearly has an inductor, complete with the reference designator "L1". Thus, the board is a boost converter, possibly regulated to provide a constant current rather than a constant voltage. Either way, I vote for three AA's. ak
  8. AnalogKid

    Need help to double check in this timing diagram of a latch

    Your drawing shows B changing state in-between the S clock edges. Assuming that the flipflops are standard clocked devices, not transparent latches, this is incorrect. Actually . . . The S signal is shown going into an "en"able input, not a clock input. This implies that the devices are...
  9. AnalogKid

    DIY car taillights into lamp

    With LED lights, there must be some form of current-limiting somewhere. This can be built into the lamp assembly, or into whatever control module drives the assembly. On this or other forums, someone who knows more about modern car wiring can answer that. If it is built into the lamp...
  10. AnalogKid

    DIY car taillights into lamp

    At a minimum you will need a small power supply to convert mains voltage into whatever the lights require. Separate from that, are these the lights that come on in a 1-2-3 pattern? If you, do you want to preserve that, or just have them be on steadily? ak
  11. AnalogKid

    maximum DC Voltage

    It depends entirely on the circuits on the board. Sometimes a board has an on-board voltage regulator, and can operate over a wide input voltage range. Sometimes there is a delicate component that requires an operating voltage within +/-5%. Without more information, or photos, or product...
  12. AnalogKid

    Modern Day Use for Old Electronics vs New Electronics. Is it Realistic & Practical?

    Completely agree. There might be some cross-over, especially when implementing logic circuits in software vs chips. And even for the hobbiest, downstream maintainability and modify-ability can be significant factors in choosing a design approach. And there can be issues with parts...
  13. AnalogKid

    Want a particular switch to cutoff my auto ac from my stick shift.

    I understand why you want a two-button teeter-totter type of switch, but you will have waaaaay more options if you go with a slide switch. Another option is a rocker switch with an oversized actuator. Often these are a slide switch internally. ak
  14. AnalogKid

    Question about switch characteristics

    Voltage? Current? Ambient Environment? Rugged/waterproof/explosion proof? Etc. ak
  15. AnalogKid

    3v from a 5v power supply

    What is the allowed voltage range for powering the device? ak
  16. AnalogKid

    3v from a 5v power supply

    If the 5 V thing is actually a power supply that converts AC mains into a regulated 5 V DC, that is an entirely different question. For that, a couple of 1N4002 diodes in series with the 5 V output will reduce it by approx 0,7 V per diode. Or not. What is the peak current being drawn by the...
  17. AnalogKid

    Help with Transformer Theory

    What you are missing is that the transformer core is, both in theory and in practice, an energy limiter. When the 10 V is transformed up to 20 V, the available max current is transformed down to 1 A. When calculating the current through a resistor, Ohm's Law assumes a theoretically perfect...
  18. AnalogKid

    Inject sound to a phone landline (electric boogaloo)

    For a standard phone line, the phone signal is on the center two pins of an RJ-11 connector. In the cable, the wires are red and green. Since you know nothing about the interface circuits for the modem and the Sega, start with a coupling transformer. Typically these are designed for an...
  19. AnalogKid

    Hello, I want to reduce 12 volts to 7 volts, how many ohms do I need using a resistor?

    3.
  20. AnalogKid

    Hello, I want to reduce 12 volts to 7 volts, how many ohms do I need using a resistor?

    This question is so blazingly incompetent, it smells like a troll. ak
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