Copy of Kore-Eda pre ? - diyAudio
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Old 29th April 2006, 03:31 PM   #1
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Join Date: Sep 2004
Question Copy of Kore-Eda pre ?

They are two new products from Sakura.

http://www.sakurasystems.com/products/koreeda.html

Maybe it will be easy to make a copy of the preamp ?

Can anybody identify the components in the preamp ?

Click the image to open in full size.

As far as i can see they use:

1. Small transformer from Talema/India with 2x115V input and two 2.5VA 15V AC outputs

2. Two rectifiers composed from four normal diodes

3. Two bigger caps, probably 3300/25V Panasonic TS-HA?

4. 78xx and 79xx regs with two small electrolyt caps - decoupling caps ?

5. Preamp section with adXXX opamps ?

6. Small red tantalum caps close to opamps ?

7. Around opamps they are four resistors

8. One polystyren/aluminium input? output ? cap from BC ?

Can anybody identify more details and maybe create the schematic of this small pre ?

Who knows, maybe it sounds very good.

Cheers, sinski
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Old 3rd May 2006, 04:04 PM   #2
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Join Date: Sep 2004
This is the link for preamp picture :

http://s7.photobucket.com/albums/y25...&current=2.jpg

I am completely electronic newbie and have no to much knowledge about electronics. In the last days i was just reading about opamp based pres and looked carefully on Kore Eda pre.

I found the SWCAD software from LT and i created a circuit, which could be the pre, but i am not sure about it.

http://s7.photobucket.com/albums/y25...oreedapre1.jpg

Can anybody help and say if it is OK ?

What about

R1=2K
R2=100K
R3=1K
R4=2K

C1=10uF
C2,C3 4.7uF

Any ideas ?

sinski
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Old 4th May 2006, 01:03 PM   #3
diyAudio Member
 
Join Date: Oct 2004
You need to add a .1uf caps to the supply rails. I would also go over the datasheet,there are suggests for the resistors values. It may have a min. gain requirement also.
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