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  1. chopnhack

    Excellent video on how electricity branches

    Always fascinated by the thought of how electrons move in a circuit, this man demonstrated using an o-scope - much dedication for probing what must have been a few hundred times!
  2. chopnhack

    Interesting Video on LED's

  3. chopnhack

    Hurricane Ian

    Hey all, Ian hit hard in South Florida. Let's all pray for our members down there. I have still to hear from one member in particular. I am hoping that they evacuated!!
  4. chopnhack

    When did EP get so fancy?

    Hey all :-) Haven't been by in awhile and so quite a bit of a change to the format. Looks very professional, good job Ian!
  5. chopnhack

    Spring constant versus electric repulsion

    Is this question this simple to answer? I feel like some of these questions are too easy....Makes me uneasy like I am missing something! Two spherical point charges each carrying a charge of 40 mC are attached to the two ends of a spring of length 20 cm. If its spring constant is 120 Nm-1, what...
  6. chopnhack

    Particles in a Field

    Hi all! I am taking a class so no spoilers please! Question: A proton moving to the right at 6.2 × 10^5 ms-1 enters a region where there is an electric field of 62k NC-1 directed to the left. Describe qualitatively the motion of the proton in this filed. What is the time taken by the proton to...
  7. chopnhack

    Advice on becoming an engineer?

    Hello all, I would like to ask some broad open ended questions to illicit as much constructive conversation as possible. Why did you choose to become an EE? Did you graduate from an ABET accredited school? Do you hold a professional license (PE)? What type of work did you end up doing? Thank...
  8. chopnhack

    Happy New Year!

    I hope everyone is enjoying the New Year or the New Year countdown, depending on where in the world you are! Enjoy, be safe and see you all in 0x7E1 :p:D
  9. chopnhack

    Mooshimeter

    Every hear of this one? Looks great for many applications, really neat!
  10. chopnhack

    UV LED PCB Lithography Exposure Unit

    chopnhack submitted a new Showcase Item: UV LED PCB Lithography Exposure Unit Read more about this showcase item here...
  11. chopnhack

    Laser Rust Removal

    Wow, I had never seen this before!
  12. chopnhack

    LED Driver Wattage Question

    Hi all, I am looking at some LED drivers from Flea-Bay ;-) I am confused on the markings and I am thinking its just cheap marketing techniques to get you to buy under rated products. Here is an example...
  13. chopnhack

    Simple video on how boost converters work with demo

    Hi all, came across a quick video with demonstration of a boost converter. Thought it was worth sharing:
  14. chopnhack

    Anyone use this rework station?

    Looks like a Hakko knock off and I really love my iron made by them! Price is good too. Just curious if anyone has used one and what their experiences with it might be. Thanks! @hevans1944 - check it out...
  15. chopnhack

    shockwave plugin crashing

    Is anyone else getting an error with shockwave plugin crashed? Chrome ver 53.0.2 on win7 - yes win7 cause i like to hold out ;)
  16. chopnhack

    Voltage Drop across NPN BJT C&E?

    Scrapping the MOSFET idea due to static sensitivity, I would like to use a N channel BJT to turn on/off a circuit. The base will be taken high by a pic output. With some testing tonight using a S9018 transistor, I found that by biasing the base with various resistances, I was able to get...
  17. chopnhack

    Help with N-Channel Mosfet as a switch at low voltages.

    Hello all, I am working with a 2n7000 N-channel MOSFET and not getting the desired effect. I was expecting to use the fet to switch power to the rest of my circuit at 3VDC. I checked the data sheet and it says that my typical VGS(th) is 2.1 so at 3VDC I should be able to saturate the gate...
  18. chopnhack

    Modulating ADC channels?

    Hello all, I added in the code for monitoring both ADC inputs (pic12f675) to my ongoing project, but its not working. I need some help getting the code to function properly. I am not sure of how to alternate between ADC inputs. When I set the ADCON0.bits for voltage and right justification...
  19. chopnhack

    Help with ADC conversion registers in PIC or possible logic in code flaw

    Hi all I am trying to get a rather simple program cobbled together to run some tests on my run delay board. Since that thread is a bit long and was mostly dedicated to producing the board as well as a running commentary on the project, I will break this problem out as it can stand alone. Can...
  20. chopnhack

    Getting value of ADRESH out of a pic μcu?

    Can I ask for some assistance in how to get the value of ADRESH out of a pic12f675? It is a single port 8 pin chip and I would like to read the contents into a variable so that I can do operations on/with it. I am using AN1 as my analog input from a potentiometer. Thanks in advance.
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