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  1. AnalogKid

    Circuit works with any LED, s long as one is red.

    Here is a link to what probably is the origin for this circuit. http://www.cappels.org/dproj/simplest_LED_flasher/Simplest_LED_Flasher_Circuit.html You might be right on the hairy edge of your particular transistor's avalanche voltage. Power the circuit with two 9 V batteries in series and...
  2. AnalogKid

    110 220V detection

    Again, #2 and #5. ak
  3. AnalogKid

    110 220V detection

    Sounds familiar ... wait ... Aha - post #5. ak
  4. AnalogKid

    Front panel fabrication - low cost shops

    Back when I was actually paid to sit on my butt in front of a computer for much of the day, I had a 40,000 sqft metal shop underneath my office. They were magicians, and I am permanently spoiled. I can do good enough panel work, but it is tedious. There have been several threads about low...
  5. AnalogKid

    I Need a Device that Can Tell a PC the State of Relay Contacts

    Since you brought the good old parallel port days . . ...
  6. AnalogKid

    110 220V detection

    Following up on crutschow's solution, there are two different configurations for a single-relay solution. Start with one 240Vac relay with DPDT contacts. 1. The relay completely connects/disconnects two separate banks of heaters, one for 240 V and one for 120 V. To save a nickel, this can be...
  7. AnalogKid

    Using a PIR to both turn on and turn off LEDs

    Your question needs more information. What power source is available for the control circuit / latching relay / whatever? Also, what are the power requirements for the LEDs? LED product page / datasheet? I like latching relays, but they tend to be big and expensive. What is your skil set...
  8. AnalogKid

    Knowledge Threshold from Hobbyist to Professional

    Ah, but relying on imagination is not a viable long-term strategy. What happens when a problem comes up and you can't imagine a solution? With no forcibly-broad (Why do I have to learn xxx?) foundation, how do you fare? Both Einstein and Edison were hampered by their outstanding imaginations...
  9. AnalogKid

    Custom LED Lightbulb circuit

    Your questions tell us what you don't know, in more ways than one. This has nothing to do with ""ugly" questions", and the experienced members of this forum are not at all "terrified" of mains circuits. What we are afraid of is the danger to someone who has no idea how dangerous and...
  10. AnalogKid

    Custom LED Lightbulb circuit

    5A1 is actually 5R1, the code for a 5.1 ohm resistor. ak
  11. AnalogKid

    Opening Curcuit via MicroController

    Please be more clear with your use of the terms "open" and "closed". In electronics, an open circuit is when a switch is in the OFF position, and a closed circuit or switch is when the switch is in the ON position. This probably is different from the way automotive people describe fuel...
  12. AnalogKid

    Lowering 54vdc to 48-50vdc

    Did I miss the post with the amplifier current rating? Without this, there is no way to reduce the large number of possible methods. OK - looking at the datasheet, the part can run on 53.5 V. At high current levels, that's less than one diode Vf voltage drop from your 54 V source. Use two or...
  13. AnalogKid

    Switch set up

    What limits or determines the speed of the descent? Does the platform drop at the same rate it climbs? You say that power is removed from the system when the platform reaches the top. Does that mean that gravity works against the motor inertia to bring down the platform? Whatever the...
  14. AnalogKid

    Stopping at a led in a cascading 18 running circuit

    Your question is not clear. What is it you are trying to do? What is the circuit supposed to do? Can you provide a more complete schematic with the switches, any resistors and other components, and the LEDs? Where are you located? ak
  15. AnalogKid

    Time to Digital Converter

    Isn't this just an interval counter? Or a shift register? The delay line approach is conceptually more simple, but the precision will be low. What time resolution does the output have to represent? Also, this seems like a pretty simple task for a masters project. ak
  16. AnalogKid

    hacking a smoke alarm

    Not as complicated as you might think: https://www.electrodragon.com/product/special-sound-identifier-module/ ak
  17. AnalogKid

    Fuel level switch

    Consider for a moment how predictable your responses have become.
  18. AnalogKid

    Fuel level switch

    Depends on the nature and characteristics of the signal being switched. ak
  19. AnalogKid

    Fuel level switch

    Prisoner: What do we do now? Cool Hand Luke: Nuthin. ak
  20. AnalogKid

    Fuel level switch

    Yeah, I'm aware of how they work. My point is that the reqs in #1 sound like this to me: Assuming the resistive sensor is biased with a fixed resistor to either +12 or GND. This changes the direction the resulting node voltage moves in as the tank empties, but it still is a simple...
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