bridge preamp

digi01 · 7th March 2008, 08:20 AM

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

digi01 · 7th March 2008, 08:21 AM

pic

digi01 · 7th March 2008, 08:24 AM

close up

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

jaudio · 7th March 2008, 11:50 AM

digi01

As alway good work! You have neat stuff

redrabbit · 11th March 2008, 04:47 AM

Nice.

Where did you get your attenuator switch ?

=RR=

digi01 · 12th March 2008, 12:32 AM

thank you

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

zang

Tolu · 12th March 2008, 08:58 AM

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?

digi01 · 24th March 2008, 01:41 AM

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

abid_rehan · 24th March 2008, 06:43 AM

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.

12th March 2008, 12:32 AM	#6
digi01 diyAudio Member Join Date: Mar 2003 Location: BEIJING	thank you the attenuator was built by myself.it is 24step shunt type. i buy the switch from a local shop. zang __________________ 2010 DIY ALBUM UPDATED UCPv1(preamp) & DUAL(power supply)

24th March 2008, 01:41 AM	#8
digi01 diyAudio Member Join Date: Mar 2003 Location: BEIJING	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 __________________ 2010 DIY ALBUM UPDATED UCPv1(preamp) & DUAL(power supply)

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7th March 2008, 11:50 AM	#4
jaudio diyAudio Member Join Date: Oct 2004	digi01 As alway good work! You have neat stuff

11th March 2008, 04:47 AM	#5
redrabbit diyAudio Member Join Date: Oct 2004	Nice. Where did you get your attenuator switch ? =RR=

12th March 2008, 08:58 AM	#7
Tolu diyAudio Member Join Date: Mar 2007	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?

24th March 2008, 06:43 AM	#9
abid_rehan diyAudio Member Join Date: Mar 2007	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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