Is this resistor listed right? 2.7 Ohm or 2.7k Ohm?

loopyeddie

loopyeddie

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I'm building a couple audio amplifiers to run a Saturn in an arcade cab. I found a very good layout/schematic but I am unsure about the proper resistor size. It says 2.7 Ohm, but that is such a weird resistor size. Is this right or should it be 2.7k Ohm? Also it asks for 250uF caps. Again this is an uncommon rating. Will 220uF work okay? Please help me out. Here is the layout pic (sorry about the huge size, I didn't want to bother with resizing it):
audioc.gif
 
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T

toodles

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I haven't built it personaly, but Im guessing it is indeed a 2.7Ohm. The original schematic says 2.7Ohm, the breadboard layout guide says 2.7Ohm, and the same resistor on the dual audio amplifier (click 'Hardware' on the left hand menu of arcadeos.com) is a 2.7Ohm.
 
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ttooddddyy

ttooddddyy

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maybe im missing something- i dont see any links to schematics anywhere ?
 
loopyeddie

loopyeddie

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Ok, pic should be fixed. I'm pretty confident that the 2.7 Ohm resistor is correct. I still need to know if the 220uF cap will work instead of the 250uF one. Thanks!
 
werejag

werejag

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how about you use a couple of resitors in series if you cant find the proper rating
 
loopyeddie

loopyeddie

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I found the proper rating of the resistor. Resistor problem solved. Now, can I use the 220uF cap instead of a 250uF one?
 
Dean

Dean

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That 2.7 Ohm rating is basically not even a resistor. That doesn't sound right to me at all. There's more resistance in the wire you're using than that.

Also, the cap size shouldn't matter at all between 220 and 250 µF
 
loopyeddie

loopyeddie

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D-Lite said:
That 2.7 Ohm rating is basically not even a resistor. That doesn't sound right to me at all. There's more resistance in the wire you're using than that.

Also, the cap size shouldn't matter at all between 220 and 250 µF
Click to expand...

I have found it listed as such in 3 diferent places now, and never as 2.7k Ohm, so I think it is right. It does seem weird though.
 
loopyeddie

loopyeddie

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Yeah, somewhere said it filtered out high frequency noise. Whatever. I built it and am installing it tomorrow. We'll know for sure then!
 
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