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Building a light but powerful electromagnet.
I don't know if you've ever used magnet wire before, but it doesn't have traditional insulation. It has a sort of oxidized (or something similar) coating. You can 'strip' this coating off with a cigarette lighter. Just make sure that whatever gauge magnet wire you choose, it can handle the...- groggory
- Post #24
- Forum: DIY (Do-It-Yourself) Discussions
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Help building the Ultimate Music Computer (power supply).
you could always just regulate the whole PC's power. My idea on this would be look at ham radio surplus. For instance, I have a 40V, 8A linear power supply (~25 lbs and quite large) that could be turned into a linear PC power supply with an additional assortment of voltage dividers and...- groggory
- Post #27
- Forum: DIY (Do-It-Yourself) Discussions
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are there better looking 1/4" jack then the neutrik locking?
Awhile back I bought just about every 1/4" jack I could get my hands on. And as far as a solid feeling when you plug in, the neutrik locking jack was definetely number 1, but number 2 was the deluxe radio shack jack. It has a black rectangular casing, like 8 pins, and a little gold ring at the...- groggory
- Post #8
- Forum: DIY (Do-It-Yourself) Discussions
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Pics of the Gilmore amp on 16 pin DIP sockets
It might just be me...but seems like you've basically just built yourself a gold plated solderless breadboard. Cool stuff though.- groggory
- Post #15
- Forum: DIY (Do-It-Yourself) Discussions
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Off topic DIY question
just something to think about... but if this is for a super high brightness bike light, try looking at the luxeon star LED's. They are REALLY REALLY bright. And being that you're thinking of 20x white LED's, the price should be similar too.- groggory
- Post #10
- Forum: DIY (Do-It-Yourself) Discussions
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Balanced volume control
As far as I can tell, you're SOL. The linear pot + resistor as aprox log is only good when you're deal with a voltage divider. Here, we're talking about a simple rheostat. I can't think of a good way to get variable log resistance other than using a log pot. Sorry.- groggory
- Post #2
- Forum: DIY (Do-It-Yourself) Discussions
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Building a light but powerful electromagnet.
wow kevin, that is seriously impressive Plus the "This magnet contains approximately 12 miles (19 km) of superconducting wire." "dissipating the heat generated from the 85.5 kJ of energy that is stored in the energized magnet" Those little specs in themselves show the sheer enormity of...- groggory
- Post #21
- Forum: DIY (Do-It-Yourself) Discussions
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1/8" headphone socket
Quote: Originally posted by meat01 Looks like somebody's got a case of the Mondays I do believe someone would get their ass kicked saying something like that. Wow I love that movie- groggory
- Post #8
- Forum: DIY (Do-It-Yourself) Discussions
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Building a light but powerful electromagnet.
Quote: Originally posted by kwhead Well, since niether silver nor copper is ferromagnetic I'm guessing those old quarters would be pretty difficult to pickup regardless of their weight . One thing that can help *a lot* is to guide the flux from the end of the magnet not pointed at the...- groggory
- Post #12
- Forum: DIY (Do-It-Yourself) Discussions
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1/8" headphone socket
for god's sakes...there is another thread just like this 3 threads down and another 1 page back. http://www5.head-fi.org/forums/showt...threadid=68067 Try and keep things consolidated with like 2 seconds of searching please- groggory
- Post #2
- Forum: DIY (Do-It-Yourself) Discussions
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Building a light but powerful electromagnet.
Quote: Originally posted by Voodoochile Canadian quarters can be picked up with a magnet. I was thinking the same thing until I saw where Kelvie hails from. True, but I still like the method I came up with. That way you have no bumps on the quarter to increase the gap, and you have...- groggory
- Post #10
- Forum: DIY (Do-It-Yourself) Discussions
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High quality 1/8" stereo jacks
http://www5.head-fi.org/forums/showt...threadid=67316- groggory
- Post #2
- Forum: DIY (Do-It-Yourself) Discussions
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Building a light but powerful electromagnet.
ok, here are some other thoughts of mine.... because inductance increases with diameter of the coils, using a larger coil diameter is in your favor. However, this also means you need a larger core. I would suggest finding a high permeability piece of iron stock, machining it into a...- groggory
- Post #8
- Forum: DIY (Do-It-Yourself) Discussions
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Building a light but powerful electromagnet.
Just playing around on google.....few little facts for you to play with --------- The force between two magnets equals B2A/(2KU0) where: B is the magnetic field (measured in teslas), A is the cross-sectional area (in square meters), K is the relative permeability of the magnet...- groggory
- Post #7
- Forum: DIY (Do-It-Yourself) Discussions
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Radio Shack Multimeter
oh, and for resistor matching, build yourself a wheatstone bridge- groggory
- Post #3
- Forum: DIY (Do-It-Yourself) Discussions
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Radio Shack Multimeter
Don't blow that much on a Radio Shack Multimeter. Go pick up a $10 multimeter to hold you over. Buy a TLE2426 rail splitter for your power supply section. And 1% vishays for your feedback resistors. Later on you can pickup a good multimeter for not all too much. :-) Keep on truckin- groggory
- Post #2
- Forum: DIY (Do-It-Yourself) Discussions
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Mains CMOY (dual secondary trans) ?
Tangent, maybe you can just enlighten me.... How does a resistor supress ripple? I understand how capacitors filter out ripple. And the usefulness of inductors. But I don't understand the use of resistors in power supplies. Could you just give me a mini tutorial on power supply design? Thanks- groggory
- Post #4
- Forum: DIY (Do-It-Yourself) Discussions
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Guitar pedal request
Ok, so let me just try and figure out the circuit. Please tell me where my errors are.... The 'IN' socket mono socket with 2 isolated ground wires -pin 1, tip : pin 2, ground : pin3, ground -When a mono plug (as used in guitars) is inserted, the tip portion of the plug shorts to Pin 1...- groggory
- Post #11
- Forum: DIY (Do-It-Yourself) Discussions
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Guitar pedal request
why is the battery negative connected to the 'in' ?- groggory
- Post #5
- Forum: DIY (Do-It-Yourself) Discussions
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Guitar pedal request
is this how the circuit should look?- groggory
- Post #4
- Forum: DIY (Do-It-Yourself) Discussions
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heads up
wow, those are some beefy film caps- groggory
- Post #5
- Forum: DIY (Do-It-Yourself) Discussions
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Mains CMOY (dual secondary trans) ?
I think you could very easily leave that resistor out. However, I can't read what values of caps you are running. So I can't compute what the filter ripple will be. That is about as simple a power supply as can be had, but should do the trick.- groggory
- Post #2
- Forum: DIY (Do-It-Yourself) Discussions
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7 pin pot question
taken from Chu Moy's Cmoy page on headwize- groggory
- Post #2
- Forum: DIY (Do-It-Yourself) Discussions
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And yet another clone
As me and my friend were looking at the pictures I took, I was zooming in and realized that I tossed the wrong opamp in in my haste. An OPA2132 instead of the intended one. Oops, but after a quick switch, I heard what this amp was really capable of. The OPA2132 was really great sounding...- groggory
- Post #19
- Forum: DIY (Do-It-Yourself) Discussions
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how do i take the volume knobs off an art dio?
when I'm working with expensive stuff, prying things off always scares me. LOL. But sometimes you gotta do what you gotta do.- groggory
- Post #5
- Forum: DIY (Do-It-Yourself) Discussions