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  1. groggory

    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...
  2. groggory

    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...
  3. groggory

    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.
  4. groggory

    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.
  5. groggory

    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...
  6. groggory

    High quality 1/8" stereo jacks

    http://www5.head-fi.org/forums/showt...threadid=67316
  7. groggory

    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...
  8. groggory

    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...
  9. groggory

    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...
  10. groggory

    Guitar pedal request

    why is the battery negative connected to the 'in' ?
  11. groggory

    Guitar pedal request

    is this how the circuit should look?
  12. groggory

    heads up

    wow, those are some beefy film caps
  13. groggory

    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.
  14. groggory

    7 pin pot question

    taken from Chu Moy's Cmoy page on headwize
  15. groggory

    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...
  16. groggory

    And yet another clone

    Quote: Originally posted by ufokillerz Funny, they sure look like RN60 series resistors. BTW, RN55d's are 1/8 watt resistors. Good call. Yes, they are 1/4 watt all around, not 1/8 watt. The tin was sent to me in the mail by VW and was designed to hold 5 VW coasters. And...
  17. groggory

    How do I wire up my potentiometer?

    We should start compiling a FAQ for this forum. I would be happy to moderate the FAQ if noone else wants to. Just seems like the same questions get asked time and again.
  18. groggory

    And yet another clone

    Quote: Originally posted by ProFingerSk8er wow...that looks great! nice tin too.. keep us updated Solen 5.1uF 400V -Parts Express Vishay Tantalum "Tantalex" 199D .1uF -Mouser PN#74-199D35V0.1 Panasonic EVJ 50k (not grado spec ) -Digikey PN#P2U4103 Vishay-Dale RN60D 1/4W...
  19. groggory

    And yet another clone

    I have been itching to put one of these together, so I mixed two passions... dubs and audio.... here are the results.... All the panel mount components aren't wired up yet, but those pictures will come tomorrow. I originally had plans of putting nicer RCA's...
  20. groggory

    I finished my amp but it doesn't sound right

    Here are all of the RA-1 Docs if you were curious. Once again, post closeup pics of the top and bottom. And just do basic troubleshooting. This is a textbook opamp circuit, so just do the normal, basic troubleshooting.
  21. groggory

    I finished my amp but it doesn't sound right

    post some close up pics for us. Maybe we can help you troubleshoot
  22. groggory

    Wire Stripping / Wire tinning

    Quote: Originally posted by tangent wire/cable war. My wire can beat up your wire
  23. groggory

    I just built the best amp, EVER!!!

    I thought I had better block diagram this one
  24. groggory

    Wire Stripping / Wire tinning

    Quote: Originally posted by beats unbeaten Hmm, I thought electricity always flows on the surface, which, at junctions is the solder. I also thought I read somewhere that oxidized solder is more likely to corrode the wire? I dunno, someone correct me if I'm wrong. That's what I...
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