[kklee]

Just got my kit in the mail today. It'll have to wait until I get the SOHA II out of the way. Besides that, I still need to find a pot.

A custom faceplate sounds good to me. I like how Sorta-Corda sounds.

 

[nine]

The Alps website (here) doesn't list a 100k stereo pot with switch as a stock item, although it looks like it might be available as a special order (minimum quantity is unknown, probably at least 100).

Mouser lists the 100k stereo non-switched pot (p/n 688-RK0971210D97) as "On Order" (Expected 8/18).

A quick look through the Mouser catalog doesn't come up with an immediate substitute, although both Alpha and Vishay make similar pots. The Alphas listed are single, with switch, and the Vishays are dual, but have no switch.

The ALPS pots are somewhat modular, so theoretically you could disassemble the switch mechanism of a 10k pot, and attach it to the 100k, but I suspect this would be way more difficult than it seems.

Another option would be to use a different value for the pot (10k or 50k), and adjust some of the other resistance values (r11-r16, thought I'm not sure I'm reading the schematic right) to compensate for the change in gain

I'm going to spend some time looking at other manufacturers, but I suspect the best option is going to be to run a separate switch out to the front panel, which is already very crowded

nine

 

[lordvader]

Another question I'm hoping someone could answer.

When using batteries, the unit takes the 9V supply, and using the TLE2426, creates a +4.5, -4.5 supply. However, as it can use an external DC supply of up to 28V, wouldn't the rails therefore be +/- 14V ?

I don't see a regulator in the schematic, so wouldn't that fry the chips ? Especially the DAC ?

 

[pistolpete111]

I was working on my parts list for this and I think I have found suitable parts for most of it now...but I don't know enough about the inductors required. I see that Meier uses some type of axial inductors, but the website doesn't suggest what resonant frequency or resistance they should have?

Does anyone know the exact ones he uses? or Can someone here who knows more about this stuff than I suggest exactly what inductors are appropriate?


Also, in the parts list...he uses the abbreviation "RM" for some of the capacitors - what does it stand for? He seems to be using it for the electrolytic and polyester caps?

Many thanks,

Peter

 

[pistolpete111]

Just to follow up on the 2x100KOhm ALPs RK09 from elfa.se - it arrived today and fits the PCB perfectly. (It is the version without the switch).

The knob that came with the kit doesn't fit the pot (the pot has a 9mm shaft), but the knob can be drilled to fit I guess. I assume that it was this way for Meier's amps as all RK09s have the 9mm diameter on the shaft i think.

 

[TheRobbStory]

Received my kit this morning. Thanks, Jan!

Now, time for some research.

 

[trumbldw]

Hi all - I've got one of the extended kits, and have been slowly gathering and assembling the parts.

I'm getting close, but I can't find the homes for the three 68 nF cap's (C5/C6/C9) on the PC board.

Anybody else run into this?

doh - never mind ... found 'em.

 

[hax]

anyone working on tweaking the resistor values to use a 10k rk097 instead?

 

[pistolpete111]

Quote:

Originally Posted by trumbldw /img/forum/go_quote.gif Hi all - I've got one of the extended kits, and have been slowly gathering and assembling the parts. I'm getting close, but I can't find the homes for the three 68 nF cap's (C5/C6/C9) on the PC board. Anybody else run into this? doh - never mind ... found 'em.

I also had trouble sourcing them...or at least sourcing them for a reasonable price. I got them in the end.

I finished building the amp about a week ago. The toughest part to get was the pot. Farnell had everything else!

 

[Hayduke]

Quote:

Originally Posted by pistolpete111 /img/forum/go_quote.gif I also had trouble sourcing them...or at least sourcing them for a reasonable price. I got them in the end. I finished building the amp about a week ago. The toughest part to get was the pot. Farnell had everything else!

You got yours finished? Grats!

I was just about to ask if anyone had successfully completed theirs. I've had my extended kit for a few weeks, but haven't started ordering parts yet. I have some other projects that I want to finish up before I start on this.

Could you provide links to where you sourced some of the difficult to find parts?

 

[adn6244]

my kit is on the way...

ya...anyone who has the farnell BOM, please post here..all help is greatly appreciated!!

 

[pistolpete111]

Here is the Farnell parts list I used.

Please note that it is slightly different from what Meier's list said:
1) I used 0805 sized resistors instead of the 1206. The 0805s will fit fine, are cheaper and easier to get (and can also be used in more future projects as they come in packs of 50 (only cost 1.50 per 50 tho

).
2) All resistor's I got are 1%.

Other things to note:
1) The headphone socket part number is for a packet of 10. I think it is the same price as buying 2 individal ones.
2) I think (can't remember) that Jan's list listed the Opamps as DIP package - which is an error. They should be SOIC8.
3) The pot is not in this list as Farnell don't sell it.
4) Everything else in this list is what you need to complete the "extended kit".

8044945 *********SOCKET, 3.5MM JACK; Connector type:RCA/P *F238E ***************PRO SIGNAL ******************************
8647780 ** *******DIODE, SCHOTTKY, 1A, 60V, SMB; Diode typ *10BQ060PBF **********VISHAY FORMERLY INTERNATIONAL RECTIFIER *
9519998 *** *******CAPACITOR, 47PF, 160V; Capacitance:47pF; *FSC 160V 47PF 2.5% **LCR COMPONENTS **************************
9520040 *********CAPACITOR, 330PF, 160V; Capacitance:330p *FSC 160V 330PF 2.5% *LCR COMPONENTS **************************
1100430 ********CAPACITOR, 0.22UF, 63V; Capacitance:0.22 *BQ014D0224K-- *******AVX *************************************
9332600 *******RESISTOR, 0805 1K5; Series:MC; Resistanc *MC 0.1W 0805 1% 1K5 *MULTICOMP *******************************
9332847 ** *******RESISTOR, 0805 22R; Series:MC; Resistanc *MC 0.1W 0805 1% 22R *MULTICOMP *******************************
1469911 ** *******RESISTOR, 0805, 3.3KR, 1%; Series:CRCW; **CRCW08053K30FKEA ****VISHAY DALE *****************************
1469949 **********RESISTOR, 0805, 6.8KR, 1%; Series:CRCW; **CRCW08056K80FKEA ****VISHAY DALE *****************************
1469856 *********RESISTOR, 0805, 10KR , 1%; Series:CRCW; **CRCW080510K0FKEA ****VISHAY DALE *****************************
9332502 ** *******RESISTOR, 0805 12K; Series:MC; Resistanc *MC 0.1W 0805 1% 12K *MULTICOMP *******************************
1469896 ** *******RESISTOR, 0805, 22KR , 1%; Series:CRCW; **CRCW080522K0FKEA ****VISHAY DALE *****************************
9333380 **********RESISTOR, 0805 56K; Series:MC; Resistanc *MC 0.1W 0805 1% 56K *MULTICOMP *******************************
1506149 *******RESISTOR, 1M 1% 0805; Series:LHVC; Resis *LHVC0805-1MFT5 ******WELWYN **********************************
1362559 **********CAPACITOR, 0805, 33PF, 50V, NP0; Applica *223886115339 ********PHYCOMP *********************************
9691928 *** *******CAPACITOR, 180UF, 10V; Application:Low E *EEUFC1A181 **********PANASONIC *******************************
9493620 *******OP AMP, LOW POWER, SMD, 6171, SOIC8; Amp *LM6171BIM ***********NATIONAL SEMICONDUCTOR ******************
511614 *** *******INDUCTOR, AXIAL, 22UH; Inductor type:Hig *B78108S1223K ********EPCOS ***********************************
608580 ***********INDUCTOR, AXIAL, 470UH; Inductor type:Hi *B78108S1474J ********EPCOS ***********************************
9476172 *******RESISTOR, 0.5W 5% 680R; Series:SFR16S; R *SFR16S-680R-5 *******PHOENIX PASSIVE COMPONENTS ************** *******************************
3038592 ********CAPACITOR, 0.068UF 160V; Capacitance:0.0 *MKP1837-368-161-G. **VISHAY ROEDERSTEIN **********************
9520104 *********CAPACITOR, 1.5NF, 160V; Capacitance:1500 *FSC 160V 1500PF *****LCR COMPONENTS **************************


As I could not get a pot with an integrated switch, I got this toggle and used it: (It matches the toggle Jan suppled for the crossfeed.)
1550095 ** *******SWITCH, TOGGLE, SPDT, ON-ON; Switch func *2MS1T2B2M7RE ********MULTICOMP


The amp I built with these parts sounds quite good- I've let several hifi heads listen to it and everyone was taken aback by how good it is for its price range. Having said that, I'm new(-ish) to DIY audio stuff. This was my second project - so please double check what's in the list above before ordering - just incase some parts I got are not ideal. I didn't include the quantites becuase I got extra parts in some cases (for a future project). You can get the quantites from Jan's website.

All of the part numbers were copy-and-pasted from my farnell e-reciept so there won't be any typos in them.

I think it's all fine though, my amp sounds great

Hope this helps some of yous out there!

 

[adn6244]

pistolpete111,
Thanks for the list. I'll check the details later.
I have the Alps 10k from amb Mini3 but couldn't find the 100k yet. Guess elfa is the last source.

 

[Hayduke]

So nobody has found the pot with the switch built in?

Maybe we need a group buy for the pots and/or the faceplates?

I got my kit from Jan awhile ago, but I haven't started ordering any parts yet. There are a couple other projects I want to finish first, and, because I'm waiting, some of these parts sourcing issues will hopefully be resolved.

 

[holland]

I would be interested in front plates.