LF03s Fully-Discrete DIP8 Opamp for MyRef Rev C or similar - diyAudio
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Old 25th September 2013, 06:31 AM   #1
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Default LF03s Fully-Discrete DIP8 Opamp for MyRef Rev C or similar

As the title says, this is an offer of the LF03s fully-discrete single opamp in DIP8 pinout, which can be used in a wide variety of applications. It is a direct plug-in upgrade for the DIP8 LM318 in a MyRef Rev C or similar.

There's more information at this thread:

LF03 discrete opamp

The item being offered is the LF03s SMD single opamp, fully assembled and tested, at a price of USD 25 each + s&h + PayPal fees.

The LF03d (SMD dual opamp) is also available, fully assembled and tested, at a price of USD 50 each + s&h + PayPal fees.

If interested in either unit, please send a PM or email to me:
siva dot chander at gmail dot com.
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Old 26th September 2013, 08:46 AM   #2
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Quote:
Originally Posted by linuxguru View Post
It is a direct plug-in upgrade for the DIP8 LM318 in a MyRef Rev C or similar.
Sorry, I have to retract this claim - the LF03s is only marginally stable in a MyRef Rev C. It's not a direct plug-in replacement for the LM318, LF01 or LM318+LF07 in a MyRef Rev C for now.

It's still perfectly fine as a discrete upgrade to just about any bipolar-input DIP8 single opamp in just about any small-signal and live-level application, where its sonics are comparable to or better than almost any monolithic opamp.
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Old 28th September 2013, 10:41 AM   #3
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Pic of the LF03d DIP8 dual-opamp module (this is essentially 2x LF03s mounted on a base PCB with the DIP8 pins) :

http://img27.imageshack.us/img27/3666/hy0y.jpg
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File Type: jpg lf03d_2_7x10.jpg (104.7 KB, 559 views)
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Old 9th October 2013, 10:05 AM   #4
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*Bump* - successfully used an LF03d to upgrade the I/V in a Kenwood DP-1001, where a lot of monolithics choke due to relatively low rail voltages:

LF03 discrete opamp

No issues with the LF03d, except physical clearance between the DAC riser card and the transport, which were successfully resolved.
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Old 10th October 2013, 09:37 AM   #5
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Hi!

Can this work in a Playstation1 ?
The PS1 use njm2100 dual opamp with 5v as power source.

Thank you.
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Old 8th June 2014, 09:05 AM   #6
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Quote:
Originally Posted by m4rk1z View Post
Can this work in a Playstation1 ?
The PS1 use njm2100 dual opamp with 5v as power source.
If it is a DIP8 (not SOIC8) and has rails of +/- 5V for the opamp, then it should work in principle. If the opamp power supply is just single-rail +5V, it's very tight and I'd recommend a low-rail monolithic like AD8022, LM6152 or LM6172 instead.
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Old 16th June 2014, 11:58 PM   #7
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This looks like a great opamp.
Would it be suitable in the attached circuit I'm currently building?

The OPA627 (two singles - one per channel) is used as the i/v converter, and the OPA2134 is used as a 2nd order low pass filter.
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File Type: png pcm1704_sch.png (54.0 KB, 302 views)
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Old 17th June 2014, 07:21 AM   #8
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Yup, it will work in both locations - i.e. for the two I/Vs, the LF03s (single) will be a direct DIP8 substitution, while the LF03d (dual) can substitute the DIP8 dual. The LF03 is a BJT-input opamp, but input biasing does not seem to be an issue in this circuit.
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Old 17th June 2014, 07:23 AM   #9
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Brilliant - do you think the opamps will fit in the space provided?
Here's the board:
DAC with two PCM1704
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Old 17th June 2014, 07:35 AM   #10
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The lowest OPA2134 location looks like a tight fit, because of the connector below it as well as relatively low clearance to the OPA627 above it. However, it may possibly fit with the use of 1 or 2 stacked DIP8 socket(s) as a spacer at that location.

Alternatively, just use a monolithic for the LPF and discretes for the I/Vs only (the I/Vs are more critical for sonics).
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