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Mini^3 parts list :)

post #1 of 18
7/27/10 at 8:03pm
Thread Starter 

OK, so I am back, and after my apheared post I think I have all the parts down, but just in case I'd like someone else to give some input. Any recommended parts to chenge etc.

 

Here's the order from digikey:

zzzzzz.JPG

the 33ohm resistors sell in a minimum of ten just fyi

 

And the parts from amb:

yyyyyyyyy.JPG

 

If you see anything that would be a better purchase let me know. Thanks for your help on the last thread and this thread too :)

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post #2 of 18
7/27/10 at 8:19pm

For what phones?

 

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post #3 of 18
7/27/10 at 8:34pm
Thread Starter 

sr80, but I'll be buying either ah d2000s or akg 701 later. but for now, just sr80's. I just sold my pa2v2 and I need a new amp and I figured this would work beautifully.

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post #4 of 18
7/27/10 at 9:12pm

I would go with a gain setting of 2 for the Grados to avoid the channel imbalance problem those pots can have at the lower end of their range.

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post #5 of 18
7/27/10 at 9:26pm
Thread Starter 

how would I change the gain? by picking a different pot?

 

If so, could you suggest a different pot?

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post #6 of 18
7/27/10 at 9:38pm

 

Gain R1L, R1R R4L, R4R R3L, R3R
2x 470Ω 1KΩ 1KΩ
3x 430Ω 1.2KΩ 620Ω
5x (default) 330Ω 1.5KΩ 330Ω
8x 240Ω 1.8KΩ 240Ω
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post #7 of 18
7/27/10 at 9:45pm

By changing R1, R3, and R4. See parts list on AMB's website. Make sure to order spares just in case.

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post #8 of 18
7/27/10 at 10:02pm



 

Quote:
Originally Posted by BobSaysHi View Post

sr80, but I'll be buying either ah d2000s or akg 701 later. but for now, just sr80's. I just sold my pa2v2 and I need a new amp and I figured this would work beautifully.


Since it appears I cannot create attachments... email me and will send you a parts list. :)


 

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post #9 of 18
7/27/10 at 10:08pm
Thread Starter 

ok, thanks guys. I'll order the gain 2 and gain 3 parts, just in case.

 

@MisterX that's not necessary, I've got it from here. Thanks everyone!

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post #10 of 18
7/27/10 at 10:32pm

Sure?

It's not a problem at all.

 

Anyhow I have a couple of comments about your existing parts list:

 

The "RNF 1/4" series resistors are to large to fit the PCB.

You have the TLE2426 listed twice.

The AC adapter is a switch mode type.

And... it might be a good idea to grab a spare D4, it's easy to kill those by connecting the battery backward.

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post #11 of 18
7/28/10 at 9:08am

MisterX gives good advice, as well as other posters. Spares are always good within reason. Use the Panasonic resistors that Amb specs in his parts list (P330CACT-ND, etc.). I might also get a spare rail splitter (Amb's price is better than digikey's). If you are only using the AC adapter for charging, then a switch mode type is fine. If not, use the Jameco one that Amb lists in his parts list. Unfortunately, ordering from multiple suppliers is usually unavoidable. I applaud you on your initiative to do things yourself, however. Don't see that much around here anymore :)

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post #12 of 18
7/28/10 at 7:57pm
Thread Starter 

@Pars, I love DIY! I have voided every warranty on practically everything I own, plus a lot of things I don't own. I unfortunately will be postponing the build because I spent my amp money on headphones from a fellow headfi member. I'm hoping to pick which pair I like best and sell the loser here. 

 

On amb's website he said:

 

Many "12VDC" unregulated DC adapters actually output more than 15VDC, and are good to use with Mini³

 

Well, I found one of these 12v adapters laying around the house and did a google search on the model number and this is one of the sites that came up

 

http://www.zlectronic.com/product/12313.html

 

Is this good to use?

 

also, on a semi-related note, could I sell a mini3 on this website?

 

also, on a COMPLETELY unrelated note, when will I no longer be a "Junior Head-Fi'er?"


Edited by BobSaysHi - 7/28/10 at 7:58pm
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post #13 of 18
7/28/10 at 10:49pm
Quote:
Originally Posted by BobSaysHi View Post
Well, I found one of these 12v adapters laying around the house and did a google search on the model number and this is one of the sites that came up

 

http://www.zlectronic.com/product/12313.html

 

Is this good to use?

 

For such a small adapter to be rated 2A, and the fact that it accepts 100V-240V AC input, it's surely a switching type, which would also mean that it's regulated.  12V output is not enough voltage.  Also, it's listed as "out of stock".


Edited by amb - 7/28/10 at 10:50pm
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post #14 of 18
7/29/10 at 1:08am

Thanks Very Much.......

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post #15 of 18
7/31/10 at 7:12pm

Hi

I'm preparing my part list too but have a few questions and want to be sure before ordering:

 

which gain for AKG k601?

I have an ac adapter from a router with these specs: output voltage 15.6v, current 850mA. Plug seems too thick, 4mm diameter, but I can solve this... Is current value too much?

Also I would like to use a super bright orange led, what R7 value must I choose? According to its datasheet forward voltage is 2.1V and recommended operating current is 20mA. Then I go to the online calculator mentioned on the amb site and put these values:

voltage supply 9v --  led forward voltage 2.1v -- led current 20mA  and get this: resistor value 345 (ohms) . I should get a much higher resistor value given that the default one for less bright leds is 10k. What am I doing wrong?

-is this knob ok? farnell  1282579

 

Since this is my first diy project, I've bought a 25 w solder with 1mm tip. Is the tip fine enough to solder the opamp and other smd chips? I've practised so far with through hole devices  but I guess that with smd's it won't be that easy...

 

Excuse me for my poor English 


Edited by pterodactilo - 7/31/10 at 7:14pm
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