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  1. Braeden Hamson

    Current limiting in a CC/CV power supply

    I've been looking all over for a schematic for a good power supply, but I'm not having any luck finding one that doesn't use a voltage regulator IC. Those are inefficient and I'd like to avoid them. People on this forum as well as elsewhere recommend a buck/boost converter for the voltage...
  2. Braeden Hamson

    Dead Asus X550e Battery pack

    Hey guys, the battery in my laptop ASUS X550e shows 0% battery and is not charging. I pulled the pack out, and the cells have good voltage so they're not the issue. The issue is the charger/output board, I'm wondering if anyone has any experience or ideas of what to trouble shoot. Also according...
  3. Braeden Hamson

    What is your troubleshooting sequence?

    I'm sure we've all had a moment where we have the gizmo pulled apart on our workbench we've tested all the fuses, all the components, we just can't wrap our heads around why. Then we realize it was never plugged in. Well maybe not that bad, but I've certainly had times where I should've gone...
  4. Braeden Hamson

    Should I apply pressure occasionally to a burger when I'm cooking it?

    Seems a natural thing to push on the top of a burger when I'm cooking it. But then all the juices come out. Whats the IEEE standard method of burger frying?
  5. Braeden Hamson

    Quick Question: Open Loop inverting opamp

    I've been Googling for a little bit, I can't seem to get an answer. What is the circuit for an open loop inverting op-amp? Does it even exist, or can this only be done in a non-inverting format? If it can't be inverting Then how do I make a very high gain inverting amplifier? Thanks
  6. Braeden Hamson

    Legality of non-amateur band receivers

    I'm really only curious about this, I have no strange plans. Only plans to mess with RF stuff in the future. So I know it's illegal to broadcast without a license. But is it legal to listen to non-amateur radio bands? I ask because I went to some webSDR sites (if you don't know what those are...
  7. Braeden Hamson

    Load cell interference

    I built an instrumentation amplifier following this circuit exactly. https://www.allaboutcircuits.com/textbook/semiconductors/chpt-8/the-instrumentation-amplifier/ I used a load cell out of a wii balance board. And one output I have two LEDs in series to monitor the output voltage of the whole...
  8. Braeden Hamson

    Are common grounds safe?

    In my projects I tend to tie all of my grounds together and call it a day. I'm pretty sure this is safe most of the time, but I'm wondering if there is a case where it's not okay to put all the grounds together. Off the top of my head I'd say don't tie a DC ground to an AC ground. And I get a...
  9. Braeden Hamson

    2.4 ghz point detection

    I know little about antennas, this is my first foray into RF. I'm trying to find a good antenna that works with 2.4 ghz (wifi, bluetooth and such) I'd like it to have a very very narrow "field of view." Basically I want to be able to take point measurements of 2.5 ghz intensity. I don't know if...
  10. Braeden Hamson

    Why do they print brown letters on black chip packages?

    Did all these engineers just not have a grasp of graphic design? Should engineers mingle more with those art folk so they can understand that nobody can read brown on black? Maybe the engineers only see the world in shades of grey and brown. That'd explain why they only wear brown sweaters. But...
  11. Braeden Hamson

    Battery Powered Variable Power Supply

    Hello there, I've posted about this before but I'm looking for more info. So I'm wanting to make a portable variable power supply that has a regulated voltage and current. Like those nifty bench power supplies. This one would use a laptop battery, It's made of 6 UR18650A. I found this nice...
  12. Braeden Hamson

    Hacking an Isometric Joystick

    I dug a little isometric joystick or "pointing stick" out of an old Lenovo. If you're still confused its a pressure sensitive controller. I think its four strain gauges wired up in a wheatstone bridge. As shown in this patent...
  13. Braeden Hamson

    Forward and Reverse on Low Volt DC motor using solid state electronics.

    Hey guys, I'm wanting to be able to control a DC motor's direction with an arduino. But the arduino can't output the kinda power I need to run the motor. The motor runs on 7 VDC and <1 A. I know it can be done with a DPDT relay. But I have a bunch of MOSFETs already. Is an H-bridge a better way...
  14. Braeden Hamson

    Portable Power Supply

    Hello gents, I want to build a portable battery powered variable power supply. Not sure what I'd use it for but, I think it'll be one of those things that when you have it you don't know how you didn't have it before. So I got a laptop battery pack out of a smashed laptop. It has the standard...
  15. Braeden Hamson

    Multimeter Module

    Hey guys So I've had a project kicking around in my head ever since I took the battery pack out of a smashed laptop. I thought it'd be fun to make a portable power supply that provides a few DC volts. Anyway, I'm wanting to fit all of this into an aluminum tube. I was also hoping to have a...
  16. Braeden Hamson

    Picture of an optical mouse die

    I got a close up picture of an exposed die in an optical mouse. As far as I know it's rare to have a die so exposed. But in this application it's necessary as light has to reach the die. The coolest part I think is that this is the only active part in the mouse. So all the processing and logic...
  17. Braeden Hamson

    Whats the best schematics capture program?

    I'm hunting for the best program for drawing circuit diagrams. I found Eagle CAD but that's only good for digital. LTSpice is a good one for passives but it's clunky. I downloaded Autodesk's software (student license) but I haven't dug in. Anyone have any favorites? I'd like a program that can...
  18. Braeden Hamson

    High Frequency rated cables

    I'm probably going to explain this poorly because I really don't understand it. So I was in my school's electronics lab and I was looking at a spectrum analyzer. It was brought to my attention that the cable it uses is special because it can handle the frequency at which the instrument operates...
  19. Braeden Hamson

    Encoder causing "ghosting" in button matrix

    Hopefully I can explain this in a clear enough manner. I'm making an human interface device that has 6 encoders, as well as some switches but the switches aren't important. It consists of a 7 x 4 matrix with a column of of the 6 encoders next to that matrix. The C terminal (middle pin, ground...
  20. Braeden Hamson

    How does a multimeter's continuity function work?

    This sounds like it should be really simple, but I'd like to know. I wonder because I can't test the continuity through a component, only the continuity on the same node/wire. I tested my meter with another meter and when I'm in the continuity function there's a 2.5 v potential on the leads (but...
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