digi01

tropicalrips，good PCB layout.those components looks balance and neat.I think what you need is a sexy case now What power supply do you use for? and have you do the high frequency compensate in feed back loops? congratulations

bpribadi,The case that I usually use is processed by myself,of DIY. The material is aluminium and stainless steel. Or I finish drawing want to see the low processing factory of Beijing help me to make. The advantage is that my circuit part can be at will . If use the case in common, then you have to put up with its size. Recently, the weather in Beijing is sultry I have not felt like touching it by oneself either. So choose the case of some OEM, though a little with high more costs,but they are pre-drill format

bpribadi,great works.what case are you using?looks very pretty

no problem.

Hi nakedtoes,sorry for my slow reply please check your PM.

Hi jason,have you plan to offer a all parts kit?including the case? if thus,I agree with Mackie,the budget $30-40 is realistic

I can help you build one

yes,I am diyaudio member too.

what forum?

I got all components in these days,included some varying brands that can be choose.Such as C2,I have get WIMA 0.47/400V,Sloen 0.1uf/630V,and REO 0.47uf/630V fit the boards.all things well done. Mainly amp board have install complete and I am writing a manual book about the boards. pic look please view my web site for more pic: http://www.bjtzh.gov.cn/o/studio/ReadNews.asp?NewsID=117 for a all parts kit,still need find a sexy case and a top quality transformer. anyhow,the PCB boards and R/C kit is available now. digi

sorry bpribadi for my reply too slow.I am a little busy recently the kit is op push transistor based amp.you can choice BB or ad series opamp for pre stage. if you work with a single stage opamp,the lm6171/72 and NE5532/34 is good choice.

i am considering start a small kit groups buy.the price is around $50 USD.including all components(boards+chips+R/C+pot+case+socket).

SMD version boards,some ideas

Hi jason,good jobs. some suggestions: move the supply input and filter caps to one side of the chips and the output and output return to the other side. remove the block copper,add some pcb stand-off holes for boards fixture.add interface socket for calibrate.

if remove the volume pot.the PCB boards size is 37mmx37mm,very minize.I have design a sub-boards for CHA47 hook up. hearty cheers~

silk lay

this is my standard comy PCB layout.use 2 opa134 single opamps.ALPS vol mount on boards.wish can give you some ideas

The psu boards,I use the C-R-C-R-C modes,adjust B+ voltages is easy.

Hi foo,I remember you and congratulations for ZEN born

it is ZEN headamps,double mono version. you may check out this page for more detail:http://www.bjtzh.gov.cn/o/studio/mini-zen.htm

jason,I am very pleasure join in SGH forms.I think I can do someting for you.if you have a protel version projects. for a good step,CHA47 amps may be a good choice.we need choice a common pcb size to fit much of tins or sexy case.need setup some pcb stand-off holes on the boards.includeing volume pot. another ideas is hdam framework,that denote output chips part can add or remove easy.we need a 2pcb parts: standard comy+expanding A47 good luck

waiting components...now

I use protel software for pcb layout design. this is MJ tube headamps.optimal design can drive low Z headphones ,such as HD495 digi

CHA47

if there is a lot of diy guys to care for it.I think I can make a projects. rudiment ideas about the PCB boards size is 30x22mm.even can make a SMD component version.