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The "Lovely Cube" Headphone Amp (Lehmann Black Cube Linear Clone) - Page 73

post #1081 of 1180

I own Option-B. Here are my impressions:

http://www.head-fi.org/t/642103/oppo-bdp-105-headphone-amp/15#post_9866530

post #1082 of 1180

Hi nippon,

How are you ? It's me again ^^

I want to ask you 2 issues:

1, Can replace BD 139 and BD 140 in the other?

2, Is Matrix M-Stage is another clone version of the LC?

 

kind regards!

post #1083 of 1180

Hi linhhonlangdu, i'm fine :)

 

You can't swap the transistors with each other. The BD139 is a NPN and the BD140 is a PNP transistor & changing them will possibly cause a short circuit  !DANGER! :)

 

And the other question... yes, they are using nearly the same circuit. But as you know, you can buy a 100$ "no name Clone", a 225$ Lovely Cube, a 225+$ M-stage or a original Lehmann Linear for over 700+$. Just imagine how big the chance is, that the clones are at the same or a better quality level. So my second answer is also -> no ;)

 

kind regards,

nippon   

post #1084 of 1180
Thread Starter 

I took a little hiatus from being a head-fi'er so it's been a while since I've checked in on this thread. I'm happy to see it's still going strong after all these years.

Sometime this week I'll catch up on all the posts and update the links on the first post.


Edited by francisdemarte - 11/5/13 at 8:51pm
post #1085 of 1180

Francisdemarte, nice to see you pay a visit.

post #1086 of 1180

Finally gathering the last pieces, and will start case building soon. 

 

With a little luck, I'll get it wrapped up and running this week. 

post #1087 of 1180
Quote:
Originally Posted by liamstrain View Post
 

Finally gathering the last pieces, and will start case building soon. 

 

With a little luck, I'll get it wrapped up and running this week. 

4 weeks ago

 

Any updates? :)

post #1088 of 1180

Bah - life happened. It now looks unlikely until after the holidays. 

post #1089 of 1180

Hi,

and thanks to the grate boys starting this thread. I bought a pcb and did a part list as here:

 

part no.

value

X

component

1200808

2.2UF, 400V, EPCOS - B32654

2

C6, C7

1413949

2.2NF, 1%, 250V, VISHAY KP1830

2

C6, C7

1198551

6800 uF 50v, PANASONIC TS-HA

2

C8, C9

1166009

0.15 uF 100v, MKT Vishay BC

4

C1, C2, C3, C4, C5

1166009

0.15 uF 100v, MKT Vishay BC

4

C10, C12, C13, C15

1848452

480 uF 35v, PANA FC, 10mm D

6

C16, C17, C18, C19, C20, C21

9520660

100 pF 1% 630V, Polystyrene

2

C24, C25

9520430

22NF, 63V, Polystyrene

2

C22, C23

 

 

 

 

eBay

10 uf 35v Tantalum

2

C11, C14

 

 

 

 

 

VISHAY MBB02070 0.6 W ± 1 %

 

 

60-591-57

4.7 Ω

4

R1, R2, R3, R4

 

7 Ω

1

R5

60-591-98

220 Ω

2

R6, R8

18C6023

BZX85-C13 13V, 1.3W, parallel x2

4

R7, R9

60-591-81

47 Ω

8

R10, R11, R12, R13, R14, R15, R16, R17

60-592-19

1.5 k

4

R18, R19, R20, R21

60-592-23

2.2 k

3

R22, R27, R34

60-592-10

680 Ω

2

R23, R26

60-592-31

4.7 k

2

R24, R25

60-592-39

10 k

2

R28, R29

60-591-76

30 Ω 0.6 W ± 1% (10 Ω 2W)

12

R30, R31, R32, R33

 

 

 

 

70-096-07

BYV27/200, Philips

4

D1, D2, D3, D4

1084508

BD139-16

2

Q5, Q7

1084566

BD140-16

2

Q6, Q8

71-014-64

BC550C

2

Q3, Q4

71-014-66

BC560C

2

Q1, Q2

2102581

LM317T, FAIRCHILD 1.2V to 37V

1

U1

1013829

LM337T, FAIRCHILD -1.2V to 37V

1

U2

 

Your favorite OPAMP ex LME49720HA

1

U3

 

Your favorite LED

1

 

 

Code switch

2

SW1, SW2

eBay

50 k DACT Type SMD Stepped Attenuator, my favorite!

1

VR1

1611441

HEATSINK, TO-220, 24.4C/W

6

 

 

3.5MM JACK, 3POLE

1

 

9531726

MULTICOMP, 2 X 15V, 30VA

1

 

 

the parts are chosen from this thread as well. the part-numbers are from Farnell or Elfa in Europe. The component numbers are referd to this image from post #9468165

 

Hope this can be useful to somebody.

 

Bests/Amir


Edited by theAmir - 1/18/14 at 2:49am
post #1090 of 1180

could somebody check the diods direction in this image please? there are differences to the picture of original boards!

 

why I get 6.6v from diodes?

 

thanks

post #1091 of 1180

Hi  Amir,

 

i have never seen this type of pcb by myself so you have to show me the otherside. Otherwise i could only guess whats wright or wrong.

The partlist seems ok so far. I would suggest to match the resistors - so order a few more of each kind. You can never have enough resistors ;)

 

kind regards,

nippon

post #1092 of 1180

thanks nippon, but I can not upload pix:

Your account does not have the required permissions to access this page.

 

Any way, I measured again there is 9.9v AC + 6.6v DC, thought something wrong with the BYV27/200's, after an R-core trafo or .... Changing them to 1N4007 still the same result!!! Getting mad. Any idea? Thanks.

 

Regards

post #1093 of 1180

Hey Amir,

you can take a picture and upload it to a free image hoster in the www. You get a link to the picture which you can post here.

 

Without seeing your pcb i guess:

1.The transformer is wired and/or not working correctly -> so take apart your build an check the transformer when it is connected to the energy socket. Compare your messurements with the data of the manufactur if possible. (Are you using an 2x +15V trafo? Than without connection there should be a reading of 2x +16-18V. Also double check your wiring and take care of your own safety!!!)

2. Check your PCB and you solderconnections. Have you checked all diodes before installing them? Have you checked the capacitors in the power area?. And of course the pcb may have some issues :)

 

Bye the way -> it is normal that 18V AC are not equal to the DC output. The energy has to change their waves to become linear.

 

So inform us what is going on with your Lovley Cube clone project! ;)

 

Kind Regards,

Nippon

post #1094 of 1180

hi every one,

 

got problem with! no sound! strange voltage as in the pix here

https://www.dropbox.com/s/1szufetorc9ma8b/theCube_Voltage01.jpg

have R-Core transformer 2x15v.

 

any help please? thanks!

post #1095 of 1180

ohhhh it works. the main problem was the lousy output jack from Farnell "SCHURTER 3.5MM JACK, 3POLE". do not buy it. its beautiful and gold plated but big gap. I took it away from the part list.

 

the cube sounds now. fine too.

 

but  still a voltage difference. as the photo.

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