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

pic

close up

the opamp that i used is lm6171,i will try opa series chip later.

thank you
the attenuator was built by myself.it is 24step shunt type.
i buy the switch from a local shop.

zang

hi Thomas,
here is the sch file,
http://www.diyaudio.com/forums/attachment.php?s=&postid=1263082&stamp=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