dreamie

I got my Shuffle from Apple last night... barely 24 hours after placing the order.

First thing that irritated me somewhat is the hissing sound during silence passages of tracks, and the mechanical noises during changing of track. The 'Next' function is also retarded by a few seconds... Song still continues being played for about a second or two after the button is pressed.

Bad things aside, the Shuffle is a very good player for something compact and simple. There is some memory work to be done for some functions though. It is seriously lightweight and can be easily slotted into your pockets without detection. One of my friends is shocked to find that the Shuffle is actually in my pants...

Regarding the issue of the Shuffle getting scratched easily, I think there's nothing to worry about. My Shuffle do not have any scratches at all, after being abused (literally) by friends in school today! Amazing!! I thought the poddie's surface is gone! The only scratch I detected on it is caused by me cleaning the poddie... ... Must learn not to clean by fingernail...

Sound wise, I must say it is quite good. There is presence of soundstage and imaging is also quite good. I thought that the sounds will all be coming from the center of my head... There is also some punchiness and some life in the music. I particularly like it for something on the go. I did compare with my friends' iPods (both 4G and Mini) and they are quite similar... except for the hissing sound!

Earphones used is Etymotic ER6i. Both the earphones and poddie look cute !!

After enquiring four 7-11s today, I placed my order for it online... =p... Hope it will be here within 2-3 days... hahaha...

Have not gotten any confirmation email...

i got the 1 Gig Version @ $269.

Ahhh... sweet! It's at the MSRP...

BTW, do you have any idea if it's available at ALL 7-11s? hehehe... Thanks!

Gosh! APRIL?

 

Fuwen, why didnt u drop by 7-11s to check out the shuffle?

 

I bought my shuffle at the 7-11 outlet at Citylink.

 

Saw it at Bugis 7-11 too.

 

Weird but true = )

7-11??

How much did it cost there btw?

what's your highest bid currently?

Hi all,

Does anyone know the max power handling of the shure e2c? i tried looking through many websites but can't find anything related to power handling...

and any user comments on the e2c? compared to similarly priced equilvalents? =p... thanks...

planning to use with ipod shuffle... cmoy tentatively once power handling is known. Cheers!

Thanks for response. my tube buffer is made for my PC desktop setup. it does improve the sound of PC speakers.

What's the design you followed? Did you try the MF X-10D design posted sometime back?

Merry Christmas to everyone!!

You should try bare naked braided PC-OCC cooper from Ahfart    Get the wire from him, and braid it    Should be the coolest cable ever 

who is Ahfart where do i find him

how about using those silver wires if braid those at 4m...3 wires for the braid thats 12m of silver wire the cable might cost more then the headphones

www.ahfartaudio.com

Yes, I agree, this is a super thread

 

Hopefully Jason can meet his target, last time he said to finalized this amp by Christmas, this year, not next year

 

Yesterday I bought another OPA2228 from Farnell (previously I only have one piece) to try it in the modified Jason A47. Just rolled the OPA2134 with OPA2228, it sounds much better to my ears

 

For me, somehow the OPA2228 sounds much more musical than the OPA2134. I'm sorry Jason, I know you have bought 100 pcs of OPA2134 from Farnell But I must be honest, I favor OPA2228 more than the OPA2134, so I think it is a significant upgrade to your amp

I concur. The OPA2228 does sound much more musical and warm. In fact, I'm in favor of it over the OPA637.

How does the Ero MKT sound? I'm using them in my phono amp.

Dreamie, where you get those MUR860??

ON Semiconductor. They are also available from Farnell/RS.

bpribadi, the isolation is electrical and it conduct heat to the heatsink? I didn't know about this, where do one get this material? Thanks.

It's known as thermal tape, and frag tape by some people. Strange people calls it frag tape. Does it improve your frag count in games?

It is not readily available, but you can buy it in packs (pre-cut sizes) from Bell Electronics. Those from Bell are not sticky but they provide the electrical isolation.

Another option would be mica sheets (forgot the proper term, but it's mica) available from Silicone Electronics. More expensive than the above and cracks easily. It is not as flexible as the one from Bell, but with its usage in vacuum tubes, it can probably withstand very high temperatures.

 

Do you mean the resistor placed at the output of the pre-amp? 

 

YES.

I didnt use that. I notice them mainly in tube pre-amplifiers. I guess it's also to drain the output capacitor's current.

bpripadi,

Inverting mode is chosen for its simplicity (partly due to the VERY limited range of Holcos available as well ). By the way, sharp eyes.

The ground used to be from the +ve and -ve output of the 2 rectifier bridges, but later removed.

huangyong,

Do you mean the resistor placed at the output of the pre-amp?

Regarding the virtual ground question, except for the DEEP bass that's missing after converting, there's no other difference i noticed (I had a short-lived dual trannie-rectifier bridge PS ) However, the deep bass could also be missing due to the 1800uF capacitance per rail I removed.

The center-tap of the trannie can be used as signal ground, but note your grounding technique to remove unnecessary noise/hum injected.

bump ^^

dreamie, nice head/pre-amp.

what is the output resistance when it works in preamp mode?

i made one preamp using opa627 recently too, and i need advice to refine it.

may be can share your experience.

huangyong,

What do you mean by output resistance?

I don't have much experience to talk about.. hehe... regarding the OPA627, I recently swapped that out of my phono stage and changed it to a OPA2228... nice sweet sound! Intend to keep the OPA2228 in the phono stage.

bpribadi,

The gain is 2.7, inverting configuration. Used separates for the 'modular' design. Can swap the signal board easily if i one day decide to change it. Or i could also change the virtual ground driver board with something better (perhaps higher output for a more demanding signal board?). The power supply can also be changed. My previous power supply uses 2 trannie, 16 MUR860 diodes and 4 Panasonic FCs. Ripped that up and now I can make 2 power supplies.

Q00,

That's an evil sheep wearing Santa's hat. It's actually a jellybean dispenser.. the jellybean's dispensed out of the backside... notice that the jellybeans in that package are all brown... hehe.. but I have run out of jellybeans...

digi01,

Thanks!

I think the transformers are made in Shanghai, not Beijing. Have not been to Beijing before...

lastly... the virtual ground divider...

the TO220 package is the BUF634 and the TO3 package is the TLE2426... no passive components other than the 2 caps were used for virtual grounding...

the underside of the signal board...

a 1uF cap is soldered directly across +ve and -ve. the feedback resistor is concealed by the 1uF cap...

a closer view...

the signal board...

Hi all,

this is the AD8610 based pre/head-amp I did up last week, after letting the components collect dust for more than a year ...

Resistors used are Holco 0.1%s...

power supply caps are Panasonic FCs (1800uF per rail on virtual ground divider board, 220uF per rail per channel on signal board), 1uF stacked film across the +ve and -ve rails on signal board...

rectifier diodes are OnSemi MUR860s

encapsulated PCB mount trannies are bought during my last trip to Shanghai...

no capacitors are used in the signal path...

this is the overall pic... no casing yet...

Probably for tubes? ... since it's 100k.

The AD8620 can work close to it's spec max of 13 V. I've tried +-13.xx V with an overcharged SLA battery before.. Maybe it's oscillating? You can add some fast bypass caps to gnd near the V+ & V- pins of your opamps.

Ok.. have some spare 0.47uF stacked films around... .. just wondering if 0.47uF is enough.

Is the Cerafine alright? Though being an electrolytic it should be faster than normal electrolytics. Have some spare 10uF Cerafines lying around too...