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Old 3rd November 2012, 03:47 PM   #481
ingo50 is offline ingo50  Germany
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to rambojj
those chips do different jobs: LM 4702 has the diff.input and the VAS without the currant-gain outpt-stage but has two chanels , whilst the LM 3875 contains a complete midpower opamp
see also: www.ti..... You can not compare apples with pears as we say in german
ingo
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Old 21st December 2013, 12:22 PM   #482
bra is offline bra
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Here is Arcam's way - maybe the best way :-)
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Last edited by bra; 21st December 2013 at 12:26 PM.
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Old 21st December 2013, 12:29 PM   #483
bra is offline bra
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and power stage - they use the same in new AVR750 so it have to be very good amplifier - I want use the voltage stage in my Primare SPA20
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Old 21st December 2013, 05:19 PM   #484
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Quote:
Originally Posted by bra View Post
Here is Arcam's way - maybe the best way :-)
The best way is to buffer the input, invert, and feed the inverting input of the LM4702. I used the OPA2604 -- it really sounds nice. I had some boards made up for a LM4702 project which was published in AudioXpress and found that I could fit the OPA2604 and associated components in the space of the rather large capacitor I was using.
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Old 28th December 2013, 01:07 PM   #485
microx is offline microx  Spain
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Default suitable mosfets

I have two pairs of Exicon 10P16/10N16 lateral mosfets I would like to use with a LM4702. I plan a 2K preset across the gates for bias adj and 220R gate stoppers. Anything else I should bear in mind.
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Old 6th January 2014, 09:59 AM   #486
bra is offline bra
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i have done, now my primare has lm4702 with original power emiter follower and it sounds great with my Dali Grand, i am very happy with it.
sound i precise, dynamic with wide and deep soundstage.
lm4702 is a high end chip in my opinion.
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Old 24th January 2014, 07:58 PM   #487
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I have two pairs of Exicon 10P16/10N16 lateral mosfets I would like to use with a LM4702. I plan a 2K preset across the gates for bias adj and 220R gate stoppers. Anything else I should bear in mind.
Use a 1k potentiometer between the SINK and SOURCE outputs of the LM4702so that you can set the bias, AND a 47k resistor from SINK to ground. Bias for about 120mA.
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