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Old 7th March 2008, 08:20 AM   #1
digi01 is offline digi01  China
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Default bridge preamp

i take almost six month to completed this small unit.it is a powerful beast in my audio chain,sound AMAZING!
i would like give you some impression about it.
zang


photos first
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Old 7th March 2008, 08:21 AM   #2
digi01 is offline digi01  China
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pic
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Old 7th March 2008, 08:24 AM   #3
digi01 is offline digi01  China
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close up

the opamp that i used is lm6171,i will try opa series chip later.
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Old 7th March 2008, 11:50 AM   #4
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digi01

As alway good work! You have neat stuff
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Old 11th March 2008, 04:47 AM   #5
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Nice.

Where did you get your attenuator switch ?

=RR=
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Old 12th March 2008, 12:32 AM   #6
digi01 is offline digi01  China
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thank you
the attenuator was built by myself.it is 24step shunt type.
i buy the switch from a local shop.

zang
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Old 12th March 2008, 08:58 AM   #7
Tolu is offline Tolu  Germany
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Hi Zang

do you have a circuit for us?

Do you think to get a hearable advantage in comparison to an OPA2134 or LM4562? Or AD815?
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Old 24th March 2008, 01:41 AM   #8
digi01 is offline digi01  China
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hi Thomas,
here is the sch file,
http://www.diyaudio.com/forums/attac...amp=1185325175.

the below is my BOM,
R1,R2------------------102,
R3,R4------------------104,
R5,R6,R7,R8----------103,
all resistor are 0805 packaged smt.
C1,C2------------------0.33uf/63V philips mkt
C3,C4------------------200p,smt
UA1,UA2,UB1,UB2---LM6171
U1----------------------LM78L15
U2----------------------LM79L15
CA1,CA2,CA3,CA4---10uf/63V elna
L1-----------------------10uH


i like nsc's chip much better,because its cost and performance.i would use lm4562 as backup.


sorry for the slow reply,i am out of town
greetings from beijing,
zang
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Old 24th March 2008, 06:43 AM   #9
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Zang:
Like always nice piece of "art".
really like those smd parts on a nice board.
Hope it sounds as good as its nice Layout.
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