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accidentally ordered smd resistors for first cmoy

post #1 of 13
12/7/09 at 11:30pm
Thread Starter 
Hi everyone,

I just received the parts I ordered from Farnell for my first CMOY. To my horror, I made the mistake of ordering SMD resistors instead of through-hole ones. Question: Can someone who has never soldered a joint in his life learn to solder these tiny SMD resistors without running out of them/stripboards? Or should I not make my first DIY attempt too hard on myself, and acquire the proper resistors before I start?

My soldering iron is the Goot TQ-95 with 2 temperature settings: 20W & 200W. It comes with a standard tip. I'll be using 63/37 solder, on a RadioShack perfboard, following the Tangentsoft tutorial.

All input appreciated. Thanks. Do let me know if I need any additional equipment (such as helping hands w/ magnifiers, etc) if you do recommend that I proceed with the SMD resistors.
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post #2 of 13
12/7/09 at 11:36pm
The biggest question is what size of resistor did you get?

I've used 0805 in place of through hole before, but that was for a capacitor.
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post #3 of 13
12/7/09 at 11:42pm
id reorder through holes if I were you.
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post #4 of 13
12/7/09 at 11:45pm
Thread Starter 
Quote:
Originally Posted by cobaltmute View Post
The biggest question is what size of resistor did you get?

I've used 0805 in place of through hole before, but that was for a capacitor.
I think they are all 0204? This is one of them:
VISHAY BC COMPONENTS|2312 155 11002|RESISTOR, 0204 1K | Farnell Singapore

They're all of that size.
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post #5 of 13
12/7/09 at 11:55pm
I'd say head over to radio-shack and pick up two of those resistor packs.

Seems like the easiest solution.

Quote:
Shack’s part number 271-0309 is a package containing 50 1/4 W assorted metal film resistors, including all values necessary to complete this project. One package is sufficient for two CMoy amps, with the exception of the 10 KΩ resistor: it only has five of these, and you need three for each amp.
50-Piece 1/4-Watt Metal-Film Resistor Assortment - RadioShack.com

EDIT: also, helping hands are invaluable whether or not you have SMD resistors or not.
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post #6 of 13
12/8/09 at 12:05am
Thread Starter 
Quote:
Originally Posted by nullstring View Post
I'd say head over to radio-shack and pick up two of those resistor packs.

Seems like the easiest solution.



50-Piece 1/4-Watt Metal-Film Resistor Assortment - RadioShack.com

EDIT: also, helping hands are invaluable whether or not you have SMD resistors or not.
I live in Singapore; we have no RadioShack here, unfortunately.
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post #7 of 13
12/8/09 at 12:06am
You should order through-hole parts. While it's possible to use the 0204's with perf board (more than 3mm x more than 1mm), it will be very painful, especially for a first project.

I say "painful" instead of difficult for 2 reasons.
1. Those resistors are round and will not settle in one place without being nested on a PCB, making soldering them downright Sisyphean.
2. If you don't come to enjoy the hobby, it would really suck to spend the money on a good pair of tweezers, a magnifying glass, and enough flux to keep those buggers in one place for a one-shot deal.
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post #8 of 13
12/8/09 at 12:10am
How does eBay look? Shipping should be plenty fast to Singapore.

How about getting some tweezers and use the leads from the capacitors to hold them in place? ...if they're not wide enough to short the resistors.
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post #9 of 13
12/8/09 at 12:12am
Those are MELFs and are about the size of a 1206 resistor.

There are special pad arrangements and solder requirements for them above a standard 1206 SMT resistor.

I would re-order (or learn to build a board for them )
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post #10 of 13
12/8/09 at 12:13am
Quote:
Originally Posted by nihraguk View Post
I live in Singapore; we have no RadioShack here, unfortunately.
Oh, sorry, You had said you got the RS perfboard, so I made an assumption.

Is there no place to buy resistors locally?

I hate paying excessive shipping charges, so if it were me, I'd probably try to make do with the troublesome resistors. just solder all the resistors first before you do anything else...

That way the worst that could happen is that you need to order new resistors and you need to use the other side of your perfboard.

EDIT:
Quote:
Originally Posted by ShinyFalcon View Post
How does eBay look? Shipping should be plenty fast to Singapore.

How about getting some tweezers and use the leads from the capacitors to hold them in place? ...if they're not wide enough to short the resistors.
thats a good point
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post #11 of 13
12/8/09 at 12:13am
Thread Starter 
Thanks for the input guys. Think I'll write these SMD resistors off and look for through-hole ones instead.
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post #12 of 13
12/8/09 at 12:57am
Yeah get one of those resistor packs from ebay (the ones that have like 20 resistors of every value). They're not the best quality for audio but they'll be better than trying to solder tiny SMD resistors and it's always nice to have various values sitting around for experimenting.
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post #13 of 13
12/8/09 at 10:34am
Hmm... I have quite a fair bit left after doing the Cmoys, PM me what you need and I can check it out.

Or go down to Sim Lim Tower, they sell the necessary resistors there.
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