Guest Xcen Posted May 26, 2003 Report Share Posted May 26, 2003 Hi!I'm preparing stuff to build my first midibox+ and I was wondering what you guys think about scavenging old resistors, leds, switches, pots and capacitors from old motherboards, amps and the like... Can some1 provide me with a link on how to read capacitors and resistor values as well?TIA! Quote Link to comment Share on other sites More sharing options...
LO Posted May 26, 2003 Report Share Posted May 26, 2003 HiResistors: probably not worth it as they are very cheap!Caps: your better off with new ones as they can be difficult to testPots: yeah 2nd hand is goodSwitches: yip goodLeds: no problem there eitherSorry I dont have a resistor value chart handy but they should be easy to find?LO Quote Link to comment Share on other sites More sharing options...
js Posted May 26, 2003 Report Share Posted May 26, 2003 Not that I use it, I measure. But here a resistor chart:http://members.tripod.com/~schematics/resistor.htmhappy scavenging!!js Quote Link to comment Share on other sites More sharing options...
MrMusicman Posted May 26, 2003 Report Share Posted May 26, 2003 HeyNormal resistor (5-10%) have 4 color rings.Ring 1, Ring 2, Ring 3 and Ring 4.One of then will be gold or silver.Place the resistor with that one to the right, Its ring 4.Take the number of ring 1 (from the color code below), write it on a paper.Take the number of ring 2, and write it to the right of first number.Place the number of zero's from ring 3 coler code and place it to the right of the 2 number.Thats you resistor value in ohm.Remove 3 zero's and its in Kohm or remove 6 zero's and its in Mohm.Color code:Color____Number__Number of zero'sBlack______0________nonBrown_____1________0 ( 1 )Red_______2________00 ( 2 )Orange____3________000 ( 3 )Yellow_____4________0000 ( 4 )Green _____5________00000 ( 5 )Blue_______6________000000 ( 6 )Violet______7________0000000 ( 7 )Grey_______8________00000000 ( 8 )White______9________000000000 ( 9 )Like thisResistor Brown, Green, Red, GoldValue 1, 5, 00 =1500Ohm or 1.5KohmTry for your self:Green,Blue,Yellow,Silver=?Yellow,Violet,Brown,Gold=?Gold,Green,Red,Red=?Orange,White,Black,Gold=?Hope this helpsKent Quote Link to comment Share on other sites More sharing options...
smashtv Posted May 26, 2003 Report Share Posted May 26, 2003 Heya!Check out http://www.coinoptech.com/tech/res.htmlMore fun than a table when you are digging through the parts bin for a resistor.... ;)Smash Quote Link to comment Share on other sites More sharing options...
Ian_Hurlock Posted May 26, 2003 Report Share Posted May 26, 2003 I built my midi > sync < midi converter with scavenged parts. Only the chips were new.If you are careful you can get stuff off boards and use it. ;)I don't have a resistor chart. I tell LO the colours and he tells me what they are ;) ;) ;)ian Quote Link to comment Share on other sites More sharing options...
Guest Xcen Posted May 26, 2003 Report Share Posted May 26, 2003 Thanks a lot for all those replies! I suppose values are written on capacitors? I also have a multimeter that allows me to test caps although I am not to sure how it works...Doing MrM little test:`Green,Blue,Yellow,Silver=560 KOmhsYellow,Violet,Brown,Gold=470 OmhsGold,Green,Red,Red=2.2 MOmhsOrange,White,Black,Gold=39 OmhsThanks smash for the neat app too :) (I didn't use it to solve the test though hehe)Thanks every1 Quote Link to comment Share on other sites More sharing options...
pay_c Posted May 26, 2003 Report Share Posted May 26, 2003 The cap measuring is normally done with frequency tests. A certain frequency goes in, the cap is pulled down to ground with a resistor and voila, you have a low pass filter. The capacity is then just measured by the loose of voltage.For scavenging: I really do think that its only worth it for a little more expensive parts. I did scavenge stuff also, but:Resistors, LEDs, diodes and transistors are so cheap that ordering them is just much less work.Pots, switches and so on are worth being scavenged, cause theyre just more expensive.Be carefull with scavenging caps. Especially electrolytic caps. First, they get melted very easily, and second, if they were not used for a long time (about 5 or more years) it *can* (although really seldom) happen, that they blow up although you have putted them in with the rigth polarity.Hope I could help you. Quote Link to comment Share on other sites More sharing options...
LO Posted May 27, 2003 Report Share Posted May 27, 2003 Oh yes im very wise when it comes to electronics: :-/where there is a #1 I colour in red #2 I colour blueI think they call it "paint by colour" Quote Link to comment Share on other sites More sharing options...
MrMusicman Posted May 27, 2003 Report Share Posted May 27, 2003 Hey XcenGood job on my test. I did not get you on the reverse one, Nice :DKent Quote Link to comment Share on other sites More sharing options...
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