MOX builder’s thread - Page 3

chipco3434 · 4th July 2004, 01:32 PM

Does anybody want to do a group buy for components for this project? If there is a volunteer for the identification and PN's, I'll do the purchase and mailings.

Raise your hands.

diamdiam · 4th July 2004, 07:23 PM

i'd be interested in a group buy

chipco3434 · 5th July 2004, 12:19 AM

You want to drive up and pick 'em up?

The 5% assortments aren't good enough for this project, are they?

Example...

http://cgi.ebay.com/ws/eBayISAPI.dll...824907304&rd=1

I would like to spend more on components than shipping charges.

tiroth · 5th July 2004, 12:38 AM

I think it is probably cheaper to order from Mouser, the 1% 100ppm tempco are..what, 2 or 3 cents each, and you get exactly the needed values. And you can order in quantities as small as 1. Their shipping for small packages is as little as $5.

I will repost my spreadsheet tomorrow (4th of July observed in the U.S.!) which has the correct part numbers. I just want to vet it again for accuracy, although it is in the big group buy thread.

I tried talking Jens out of a component group buy mostly because it would be an absolutely insane amount of work to kit out all the resistors.

grimberg · 6th July 2004, 05:02 AM

Tyler,

Even though I reviewed the original Moamps’ thread, I could not find the schematic that matches the discrete OpAmp board layout. Could you please tell me where I can find it?

Also, I could not find at Digikey or Mouser a 100 nF capacitor that fits the spacing of C3 on the board. Which component did you use as reference for the layout?

JensRasmussen · 7th July 2004, 03:08 PM

I have a lot of these from work (They were thrown out because they are not used anymore)

If you are interested I can send some of them for free – you only have to pay for the shipping.

Tyler how many do you want - maybe I can send 500 or so to you, and you can send them to people from the USA?

\Jens

tiroth · 7th July 2004, 03:55 PM

Quote:

Even though I reviewed the original Moamps’ thread, I could not find the schematic that matches the discrete OpAmp board layout. Could you please tell me where I can find it?

Here was the original schematic that the boards were built from; some parts are missing now so I should probably draw a new one, but this can be used to see the component designators.

http://www.diyaudio.com/forums/showt...405#post369405

Quote:

Also, I could not find at Digikey or Mouser a 100 nF capacitor that fits the spacing of C3 on the board. Which component did you use as reference for the layout?

This is tough to find. Moamps might be able to respond with the cap he used. I ended up using Mouser 75-MKT1826410064 but the leads had to be bent. You could probably use 23PW310 (10nF!) but I have not tested this.

I am attached a slightly changed shoppping list. It has primary and alternate Mouser part numbers for most everything you need; I stuck to 1% parts, so there are a few Q values that don't exist. You can parallel if you really want them or look up a .1% part.

tiroth · 7th July 2004, 04:01 PM

Quote:

Originally posted by JensRasmussen
If you are interested I can send some of them for free – you only have to pay for the shipping.

Tyler how many do you want - maybe I can send 500 or so to you, and you can send them to people from the USA?

Very generous of you Jens.

Sure, I'd be happy to distribute. Shoot me an email re shipping cost.

Jamh · 7th July 2004, 05:06 PM

Quote:

Originally posted by tiroth

Very generous of you Jens. Sure, I'd be happy to distribute. Shoot me an email re shipping cost.

I'm interested in the above. Please let me know. I'm also interested in a group buy for the components, if there is one.

tiroth · 7th July 2004, 05:26 PM

If anyone feels it worthwhile, I'm willing to coordinate purchase of the film caps. This is unlikely to make sense unless you know that you need Jens' caps and want to get it all shipped for one cost--the price breaks aren't huge.

For example, the 100nF Wima ($0.79) becomes $0.57 at 100 units. The cheaper 100nF MKT1826 ($0.21) only drops to $0.17.

I'm not willing to kit out all the resistors though. Chipco3434, are you serious about doing this? If so, it would make much more sense to have the caps sent to you.

People who have an interest, please email me to avoid cluttering the thread. Let me know about how many caps you want and if you want the polyester or the Wima in the spreadsheet. If I think there is sufficient interest (I would be surprised, honestly) I'll start a thread.

7th July 2004, 03:08 PM	#26
JensRasmussen diyAudio Member Join Date: Jul 2002 Location: Denmark - Jutland	Free 1 uF 10% 63V film caps for the mox filter I have a lot of these from work (They were thrown out because they are not used anymore) If you are interested I can send some of them for free – you only have to pay for the shipping. Tyler how many do you want - maybe I can send 500 or so to you, and you can send them to people from the USA? \Jens

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4th July 2004, 01:32 PM	#21
chipco3434 diyAudio Member Join Date: Feb 2004 Location: Racine, Wisconsin	Does anybody want to do a group buy for components for this project? If there is a volunteer for the identification and PN's, I'll do the purchase and mailings. Raise your hands.

4th July 2004, 07:23 PM	#22
diamdiam diyAudio Member Join Date: Mar 2002 Location: Chicago	i'd be interested in a group buy

5th July 2004, 12:19 AM	#23
chipco3434 diyAudio Member Join Date: Feb 2004 Location: Racine, Wisconsin	You want to drive up and pick 'em up? The 5% assortments aren't good enough for this project, are they? Example... http://cgi.ebay.com/ws/eBayISAPI.dll...824907304&rd=1 I would like to spend more on components than shipping charges.

5th July 2004, 12:38 AM	#24
tiroth diyAudio Member Join Date: Dec 2001 Location: Pittsburgh, PA, USA	I think it is probably cheaper to order from Mouser, the 1% 100ppm tempco are..what, 2 or 3 cents each, and you get exactly the needed values. And you can order in quantities as small as 1. Their shipping for small packages is as little as $5. I will repost my spreadsheet tomorrow (4th of July observed in the U.S.!) which has the correct part numbers. I just want to vet it again for accuracy, although it is in the big group buy thread. I tried talking Jens out of a component group buy mostly because it would be an absolutely insane amount of work to kit out all the resistors.

6th July 2004, 05:02 AM	#25
grimberg diyAudio Member Join Date: Oct 2002 Location: California, USA	Tyler, Even though I reviewed the original Moamps’ thread, I could not find the schematic that matches the discrete OpAmp board layout. Could you please tell me where I can find it? Also, I could not find at Digikey or Mouser a 100 nF capacitor that fits the spacing of C3 on the board. Which component did you use as reference for the layout?

7th July 2004, 05:26 PM	#30
tiroth diyAudio Member Join Date: Dec 2001 Location: Pittsburgh, PA, USA	If anyone feels it worthwhile, I'm willing to coordinate purchase of the film caps. This is unlikely to make sense unless you know that you need Jens' caps and want to get it all shipped for one cost--the price breaks aren't huge. For example, the 100nF Wima ($0.79) becomes $0.57 at 100 units. The cheaper 100nF MKT1826 ($0.21) only drops to $0.17. I'm not willing to kit out all the resistors though. Chipco3434, are you serious about doing this? If so, it would make much more sense to have the caps sent to you. People who have an interest, please email me to avoid cluttering the thread. Let me know about how many caps you want and if you want the polyester or the Wima in the spreadsheet. If I think there is sufficient interest (I would be surprised, honestly) I'll start a thread.