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My CMOY part list

post #1 of 7
Thread Starter 
First amp DIY project, ordering all from digikey. I will be following tangent's tutorial guide. Planning to build a single 9V CMOY with no bypass or high-pass filter.

Below is my current shop list, wondering if the parts selected are OK.

I am concerned about the resistors since I'm going with a 470uF C1 and .47uF C2.

Would you guys recommend the 11 gain R3?

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Capacitors

2 C1Panasonic CAP 470UF 25V ELECT FM RADIALP12388
2C2CAP POLYPROPYLENE .47UF 50V 2%P3933

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Resistors

1 RLED10 KΩ 1/4W metal film resistor10.0KXBK
2 R14.7 KΩ 1/4W metal film resistor 4.75KXBK
2 R2100 KΩ 1/4W metal film resistor100KXBK
2R31 KΩ 1/4W metal film resistor, gain 111.00KXBK
2R410 KΩ 1/4W metal film resistor10.0KXBK

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Op-Amp

1 OPA Dual op-amp OPA2227PAOPA2227PA
1SocketIC SOCKET 8 PIN .300 GOLDED56083

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2 IN/OUTStereo mini jack (3.5mm)CP-3535
2CONN JACK AUDIO 3.5MM 4CONDCP-43502PM
1Battery 9V battery clip 2238K
1KnobVolume Knob (aluminum; black anodized)226-1041
1POTPanasonic EVJ-Y10F03A14 10K PotentiometerP2G1103
1SPDT ???? (360-1788 out of stock)
1 D1Power indicator LED, red diffused, 3mm160-1708

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post #2 of 7
I recommend a gain of 11. I made 2 Cmoys with a 4 and 6 and I wish I had made them 11. Volume is too low with some headphones.

For the RLED, I found the 10k a bit much. My led was a a bit too dim. If you order extra 4.75, you can swap if you encounter the same.

For the switch, Radioshack has quite a few. Thats where I got mine. Or you can use the Alps for volume and power switch.
post #3 of 7
Isn't this Headwize deja vu?

Yeah, the RK097 is a good pot, but there are only about a hundred different SPST mini switches you can get. I'd look a little harder. That will keep you from ordering from a couple of places - not that I'm trying to take business away from Tangent or Amb.

I also prefer the barrel-type 3.5mm jacks, but not everyone agrees with me:
DigiKey #CP-43502PM-ND

I agree with Slaughter's recommendations, too.
post #4 of 7
Thread Starter 
Quote:
Originally Posted by tomb View Post
Isn't this Headwize [i]deja vu?
This forum is more active, guess I'd post here instead.

Quote:
Originally Posted by tomb View Post
there are only about a hundred different SPST mini switches you can get.?
Did you mean SPST or SPDT switches?
I saw many of the SPDTs but digikey recently updated site don't show pictures of the products.
I just found out now that tangent's on holiday so I guess I will be ordering the Panasonic 10K POT and an SPDT.

Could someone link me a SPDT from digikey!?
post #5 of 7
Thread Starter 
This SPDT's terminal is a straight PC and not a Solder lug. will this work?
http://www.digikey.com/scripts/dksea...147291&Site=CA


This SPDT is identical to the one in tangents list but it's slightly longer and its "Maximum panel thickness with standard hardware is 2.6mm" vs. 0.8 in tangents.
http://www.digikey.com/scripts/dksearch/dksus.dll?Detail?Ref=39055&Row=147297&Site=CA
post #6 of 7
Quote:
Originally Posted by irok View Post
This forum is more active, guess I'd post here instead.



Did you mean SPST or SPDT switches?
I saw many of the SPDTs but digikey recently updated site don't show pictures of the products.
I just found out now that tangent's on holiday so I guess I will be ordering the Panasonic 10K POT and an SPDT.

Could someone link me a SPDT from digikey!?
SPST. From Tangent's site:
"Although you only need an SPST for power, SPDTs are more common, probably because it's just as easy to make them as SPSTs and you can use them like an SPST by just leaving the second pole disconnected. Since they're more widely useful than SPSTs, some manufacturers only make SPDT toggles. (Or at least, distributors don't often carry the SPST variants if the manufacturer does make them.)"

It appears that I was referring to the theoretical - an SPST is technically all you need, but apparently Tangent is correct - the SPDT is more plentiful in toggles. Rockers seem to be much more plentiful in the SPST version. At any rate, you can use a DPDT center-off, for that matter - you only need two connections from the switch.

In that case, any of these will work:
DigiKey #432-1143-ND ($2.99 )
DigiKey #432-1153-ND (tiny bat-handle for $3.19 )
DigiKey #EG2350-ND
DigiKey #EG2357-ND

And there's always Radio Shack:

275-613
post #7 of 7
I use gain 6 and its better for my Grados and even the (supposed) hard to drive PK1. Note though I think my line output most likely is higher than yours.
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