Joachim Gerhard Filter Buffer for ES9022

[EUVL]

We have been asked what if the coils are not 18mH but 16mH ?

The inductor and the resistor after that forms a L-R filter.
In an L-R filter, L/R should be held constant (determines the corner frequency).
Thus if your L is 16mH, maybe you should consider using 16k instead of 18.7k.

See :
http://sim.okawa-denshi.jp/en/LRlowkeisan.htm


Patrick

 

[acko]

Thanks Patrick!

At least there will be no wasted parts at the end of the day 🙂

 

[woodturner-fran]

The parts kits were dispatched today!

Fran

 

[randytsuch]

I would like to add myself for 4 boards please

Phisci x8 South Africa
hirez69 x4 Italy
Boggy62 x2 France
Swalter 3x Switzerland
CFT 1x HK
tubo 2x USA
Ryssen 1x Sweden
number9 1X USA
BDL x1 Romania
rsotirov2X Canada
supra 1X Australia
syyma x1 USA
wirewiggler x2 USA
Roman M x1 Russia
Stixx 2x Germany
Malvin x1 USA
merlin2069er x1 Canada
potepuh x2 Slovenia
Blitz x2 Germany
Tagheuer x2 Canada
Stephanlj x2 Germany
Acko x4 Australia
j45yip x1 Singapore
shoom x1 UK
atupi. X1 Romania
bkdog x2 Australia
necplusulrtra x3 canada
APK x 2 UK
randytsuch x 4 USA

Running total: 60

 

[syklab]

Hi,
I am in for 1 more time.

Thanks

Phisci x8 South Africa
hirez69 x4 Italy
Boggy62 x2 France
Swalter 3x Switzerland
CFT 1x HK
tubo 2x USA
Ryssen 1x Sweden
number9 1X USA
BDL x1 Romania
rsotirov2X Canada
supra 1X Australia
syyma x1 USA
wirewiggler x2 USA
Roman M x1 Russia
Stixx 2x Germany
Malvin x1 USA
merlin2069er x1 Canada
potepuh x2 Slovenia
Blitz x2 Germany
Tagheuer x2 Canada
Stephanlj x2 Germany
Acko x4 Australia
j45yip x1 Singapore
shoom x1 UK
atupi. X1 Romania
bkdog x2 Australia
necplusulrtra x3 canada
APK x 2 UK
randytsuch x 4 USA
syklab X 1 HK

Running total: 61

 

[VT67]

My kits and inductors arrived today 🙂
Is there somewhere an image or something that shows where to put what on the board?

Regards

 

[kroyin]

2 for me pls

Phisci x8 South Africa
hirez69 x4 Italy
Boggy62 x2 France
Swalter 3x Switzerland
CFT 1x HK
tubo 2x USA
Ryssen 1x Sweden
number9 1X USA
BDL x1 Romania
rsotirov2X Canada
supra 1X Australia
syyma x1 USA
wirewiggler x2 USA
Roman M x1 Russia
Stixx 2x Germany
Malvin x1 USA
merlin2069er x1 Canada
potepuh x2 Slovenia
Blitz x2 Germany
Tagheuer x2 Canada
Stephanlj x2 Germany
Acko x4 Australia
j45yip x1 Singapore
shoom x1 UK
atupi. X1 Romania
bkdog x2 Australia
necplusulrtra x3 canada
APK x 2 UK
randytsuch x 4 USA
syklab X 1 HK
kroyin X 2 India

Running total: 63

 

[APK]

Amended order to 4

Phisci x8 South Africa
hirez69 x4 Italy
Boggy62 x2 France
Swalter 3x Switzerland
CFT 1x HK
tubo 2x USA
Ryssen 1x Sweden
number9 1X USA
BDL x1 Romania
rsotirov2X Canada
supra 1X Australia
syyma x1 USA
wirewiggler x2 USA
Roman M x1 Russia
Stixx 2x Germany
Malvin x1 USA
merlin2069er x1 Canada
potepuh x2 Slovenia
Blitz x2 Germany
Tagheuer x2 Canada
Stephanlj x2 Germany
Acko x4 Australia
j45yip x1 Singapore
shoom x1 UK
atupi. X1 Romania
bkdog x2 Australia
necplusulrtra x3 canada
APK x 4 UK
randytsuch x 4 USA
syklab X 1 HK
kroyin X 2 India

Running total: 65

 

[merlin2069er]

When will these be shipped?

 

[EUVL]

We shall collect money, then buy FETs and PCBs, then match them (8x65 =>500 FETs).
Then solder them according on the PCB, then test them ....

So realistically, some time in May.


Patrick

 

[acko]

Updated list

Phisci x8 South Africa
hirez69 x4 Italy
Boggy62 x2 France
Swalter 3x Switzerland
CFT 1x HK
tubo 2x USA
Ryssen 1x Sweden
number9 1X USA
BDL x1 Romania
rsotirov2X Canada
supra 1X Australia
syyma x1 USA
wirewiggler x2 USA
Roman M x1 Russia
Stixx 2x Germany
Malvin x1 USA
merlin2069er x1 Canada
potepuh x2 Slovenia
Blitz x2 Germany
Tagheuer x2 Canada
Stephanlj x2 Germany
j45yip x1 Singapore
shoom x1 UK
atupi. X1 Romania
bkdog x2 Australia
necplusulrtra x3 canada
APK x 4 UK
randytsuch x 4 USA
syklab X 1 HK
kroyin X 2 India

Running total: 61

Sorry Patrick, I have removed myself from the list. It is a bit too long for me. I may have to look elsewhere for the matched FETs.

 

[EUVL]

No problem. We have not started.

I just checked with WK and he confirmed proposed time frame is realistic.
Matching SOT23 FETs is a very tedious task ....


Patrick

 

[acko]

Hi Patrick,

Understand the difficulties with matching and you guys have done a great job with the first batch. Apologies for being curt earlier. It is just that I have promised a few guys with an earlier estimate (March) with your modules fully built and bundled with my DAC. Unfortunately they have now cancelled the orders. If I get any new request within your timeframe I will jump in again . Also if you can supply just the matched FETs only(different terms) please let me know.

All the best!

 

[gogowatch]

Hello Batch 2 Subscribers,

Please check PM.

Cheers,
WK

 

[j45yip]

Hi WK,

Info updated.

Thanks,
Johari

Hello Batch 2 Subscribers,

Please check PM.

Cheers,
WK

 

[swalter]

Thanks WK, info updated. Thanks as well for all the work you are putting into this.

Stefan

 

[shoom]

Hi WK

Info updated and thanks again

shaun

 

[syyma]

Hi WK,

Info updated.

Regards,

Sidney

 

[woodturner-fran]

I might have missed it, but is there a pic/image somewhere showing a silkscreen with part numbers/placement? I think it would help the first time smd solderer a lot.

Fran

 

[EUVL]

There is a document in pdf showing the component placement.
There is no silkscreen, as the components are too small.
Also no photo,as lettering on components also too small.

So please use the pdf.
It was made large enough for easy reading.


Patrick