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  1. hevans1944

    Making a Pulsing/Fading LED Circuit

    Okaaay... not a "drive by" poster, and you still seem to be interested in learning at your "advanced" age. Geez... electronics lab experiments from the 1970s... I purchased one of these a couple Christmases ago for one of my grandchildren, who has been diagnosed as having a form of autism. He...
  2. hevans1944

    Making a Pulsing/Fading LED Circuit

    I don't know anything about you, and therefore have no thoughts, better or worse, of you... yet. There are hundreds, if not thousands, of visitors to Electronics Point who believe they are informed by the likes of YouTube videos and Instructables articles. They are all "monkey see, monkey do"...
  3. hevans1944

    Signal meter salvage NHY6

    You don't. Assuming its a DC D'Arsonval meter movement, measure the meter characteristics yourself: full-scale current and meter resistance (determines voltage required at full-scale current). Use that information to help you connect it to your Arduino. Signal strength meters used in...
  4. hevans1944

    Resistor to reduce voltage for a mini fan

    There are many reasons to use a resistor to impede the flow of electricity. Dropping excessive voltage to a load that is essentially constant, like your fan, is just one reason. It is not very efficient to lower voltage in this manner, but for small loads (your fan qualifies as a "small" load)...
  5. hevans1944

    Making a Pulsing/Fading LED Circuit

    Welcome to EP, @Chris Zanowick! What the YouTube video shows is a "Monkey See, Monkey Do" demonstration with zero explanation of how the circuit works. Do you really expect to learn anything by replicating this project? If you look and listen carefully, you will notice that near the end of the...
  6. hevans1944

    Programming c on raspberry pi

    As a newbie, you should visit this page FIRST and then follow the links you find there.
  7. hevans1944

    find resistance r1 and r2 if only vin and out is given?

    I like @davenn's post #3, to which the OP has not bothered to respond. All remaining comments in this thread (including mine, which was deleted for revealing too much) are just noise IMHO until @Malik Nouman responds to Dave's questions. Unfortunately, Malik appears to be just another "drive-by...
  8. hevans1944

    433MHz door bell - Tx antenna feed

    Hmmm. Fuzzy picture seems to go well with the fuzzy logic. Check the batteries on the transmitter for fuzz too. Earlier this week, while we were looking for something (I forget what) in our garage, my wife pulled a couple of AA cells out of a box we had packed for our move to Florida last year...
  9. hevans1944

    hello from uk

    @reed: Welcome to EP!
  10. hevans1944

    SMD counting from during Pick and Place operation

    Have you tried to communicate your request to the manufacturer of the machine (or machines) you plan to use? They may be able to provide the information you need without adding another sensor. As you noted, surely they have a way to keep track of how many devices have been dispensed from each...
  11. hevans1944

    Sump pump monitor

    Try an electro-mechanical counter with a 240 VAC coil wired in parallel with the pump. This one might be appropriate.
  12. hevans1944

    {computer}: How to add a monostable to PC PWR/Reset button?

    @FuZZ1L0G1C: If you are too cheap (or cannot afford) to build a new system as @davenn suggests, just write a little program that loads and executes last, after everything else is done. Said program beeps your computer's speaker, or bangs on an I/O port bit connected to sound a klaxon, or ring a...
  13. hevans1944

    Noise Activated Switch, with a Difference.

    Indeed, yes. And a supply return or common connection to pin 8 too. I once lost an entire day trying to troubleshoot a complicated analog op-amp circuit simply because I forgot to turn on the power supply for the op-amps. Digital logic ICs also need power to function properly. You should always...
  14. hevans1944

    MOSFET Circuit Help

    I wonder if this box, or one similar to it, is what he is working on:
  15. hevans1944

    Removing DC offset

    With the "ground" lead of your oscilloscope connected to the bottom of the 10 kΩ resistor in your voltage divider, connect the oscilloscope probe tip to the cathode of the diode that is connected to the top of the 20 kΩ resistor in your voltage divider. You should see a square wave with a peak...
  16. hevans1944

    MOSFET Circuit Help

    Congratulations! Glad you managed, without our help, to figure it all out! And... LOOK! It took only 18 comments to elucidate what you felt was relevant! And yes, Genius, you DO need to spell everything out, since almost no one here has psychic powers they are willing to divulge, sans...
  17. hevans1944

    Removing DC offset

    Where is the two volt offset coming from?
  18. hevans1944

    Hello, I need help connecting an C8051F130 Silicon Labs Microcontroller to a Silicon Labs USB DEBUG

    @Jerry Houston try this Google results link. And visit their forum for peer-to-peer answers. You are not likely to get much help here unless someone is using that particular hardware and software environment.
  19. hevans1944

    MOSFET Circuit Help

    Other than a few hen scratches of an image you submitted of "MOSFET CIRCUIT" I see NO evidence of electronics involved in either the "problem" or your attempted "solution". How was the fan turned on and off before you added a MOSFET to perform this switching function? A relay contact perhaps...
  20. hevans1944

    How do I make my own musical instrument?

    @goutham gumm : It sounds like (pun intended) that you are well on your way to creating an electronic version. I don't want to pour any cold water on your enthusiasm, but I ran across the following links, embedded in another video I was watching about the air superiority of the USAF F-22 Raptor...
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