Which dual opamps should I try for I/V conversion? - Page 2 - diyAudio
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Old 6th October 2006, 04:12 PM   #11
diyAudio Member
Join Date: Sep 2004
Location: New Zealand
I think the parameter Walter Jung referred to was Vth given
by the Slew Rate divided by the Gain Bandwidth

philpoole if this use of a TDA 1541 is using a inverting opamp
followed by a non inverting ie- same device if a dual , check your
schematic and apply a 22k resistor globally around both ie:
from inverting input (also the Analog Dac output pin ), then of opamp 1
to output of non inverting opamp2. Note feedback arising from
output of opamp 2 then applies to correct two devices and not
just one device. Simply amazing when applied to a Marantz
CD50 using 2x opa627 per channel , close to if not the best
sound I have heard. Simple and effective

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Old 6th October 2006, 08:26 PM   #12
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Join Date: Oct 2004
Hi Chris,
Currently (if you forgive the pun), its only a single opamp per channel (its my first revision of this DAC, I'm still in the early stages of playing), but I can see how the global feedback for two opamps can be beneficial.
It will definitely go on my todo list (there's lots to do, and its great fun).

At the moment, I'm busy making a balanced I2S driver receiver, so I can connect the DAC to my CDP more sensibly.

Thanks for the tip!

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Old 14th August 2016, 05:19 PM   #13
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afshindiy's Avatar
Join Date: Jan 2013
Location: Tehran
Originally Posted by jameshin View Post
OPA2107 is a bad I/V converter, Gain Bandwidth is too low. OPA2604 is much better.

I/V conversion OPA2604 > OPA627 x 2 > OPA2107

Analog stage OPA627 x 2 >OPA2107> OPA2604
an other vote for you

opa2604 is one of the best for I/V and LPF after DAC.

thanks . afshin
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