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What have you made lately?



Power turns on but when I touch the red and black on the multimeter to the positive and negative on the output of the power supply I get a spark...is that bad? What could cause it?
 
Fifty volts is technically considered "lethal" voltage. It's high enough that it's start to arc.
 
The setting is fine but you want the red probe in the other port. Counter intuitive but the 10A port is only used if you’re measuring amperage (not voltage) above 200ma.
 
thanks!

So if I set it to AC and test the power input I get 120. If I set it to DC and test the output I get the same voltage that the manual dial/LED display say.

Looks like it's healthy.
 


Works but the amps are pretty low, my friend says this is normal.



[youtube]GPovb8gNGdk[/youtube]

Surprised it wasn't auto taken down for copyright music violations
 
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A couple of years ago was over by Sunol and someone had cut a tree down along side the road. A few months later there was still a fair amount left, stopped and loaded up two sections that where about 3' long and over 1' in diameter. The other sections were too long to pick up and I didn't have a chain saw with me.

Got home and quartered one piece for firewood and for some reason kept the other intact. This past December I cut the section down and in half, then started hand chiseling it into a rustic bowl. After stripping the bark off used a rasp to flatten two sections on the bottom so it would sit flat. Made a half circle cardboard templete to use as a gauge for the bowl depth of about 4-1/2". Then sanded it down, starting with 60 grit and finished with 120 grit.

Pics are before I put a coat of Howard's Cutting Board Oil on. The oil did darken it a little more than I wanted. Gave it to my Daughter for Valentine's Day. She liked the dark version better after seeing the pics and promptly put it on the kitchen table and filled it with oranges.

Bowl is just over 2' long x 1' wide x 4-1/2" deep.
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I like it :)

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Is there any kind of device that can measure low frequency sounds that most/many people would not be able to actually hear?
 
What are you trying to determine?

My gut say you want a spectrum analyzer that can show a graph of frequency on the X axis and amplitude on the Y. I’d look for one in you mobile phone platform that can be used with an external mic, which you would need to pick up frequencies that low with any accuracy.
 
I'm not sure it's worth the time and expense, and I was typing up a thread asking for help, but basically my new roommate has stopped sleeping in her room and basically has been in Napa for a week because she claims she feels/hears a low frequency vibration that causes headaches and she can even feel it it in her chest. She took everything metal out of her room including her bed frame.

I'm hesitant to call her crazy because 1. She's been totally normal and a good roommate/person otherwise 2. I've read a bunch of articles about people who claim to hear humming/buzzing/vibrations that others cannot so it's not entirely unique.

In the end I think she'll just end up leaving, but would be nice if I could actually detect said alleged humming.
 
That would be crazy if she's sensitive to infrasound. Do you have forced air HVAC? Maybe it's thrumming or something?
 
I have a water based heating system in the attic it pumps hot water from the water heater in the garage to it to heat the air. I also keep the house like 65 so it's not on that often and certainly not all night.

Her room is two floors below the attic.

The only device I can think of is a Nest fire detector I'd happily replace.
 
HappyHighwayman said:
I'm not sure it's worth the time and expense, and I was typing up a thread asking for help, but basically my new roommate has stopped sleeping in her room and basically has been in Napa for a week because she claims she feels/hears a low frequency vibration that causes headaches and she can even feel it it in her chest. She took everything metal out of her room including her bed frame.

I'm hesitant to call her crazy because 1. She's been totally normal and a good roommate/person otherwise 2. I've read a bunch of articles about people who claim to hear humming/buzzing/vibrations that others cannot so it's not entirely unique.

In the end I think she'll just end up leaving, but would be nice if I could actually detect said alleged humming.
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That is a crazy story...hopefully she won't bring some kind of action against you though not sure how she'd prove anything.
 
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