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"WHAMMY" Pass DIY headphone amp guide
"WHAMMY" Pass DIY headphone amp guide
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Old 25th July 2019, 12:34 AM   #1511
avdesignguru is offline avdesignguru  United States
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Default Whammy build: followup

There must be some truth to the "break in" period talked about by many builders. Maybe the electrolytics need time to "form" especially since this build uses Nichicon "green" bi-polars in the signal path.

Anyway, it turns out the "softness" in the bass I first heard appears to be a limitation of some of my headphones. I think they are not quite handling the extended low bass of this amplifier. My original perception of overly clinical sound character in the high end has changed. Still the same amount of detail, which is exceptional, but smoother now. Could just be my brain needed a "break in" period.

I'll have to comb through this forum and look for everyone's favorite opamps. It feels like it may be time to start rolling.
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Old 25th July 2019, 12:59 AM   #1512
Mark Johnson is offline Mark Johnson  United States
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"WHAMMY" Pass DIY headphone amp guide
If you have the bravery / chutzpah to assemble an SMD-to-DIP8 adapter card, I think you'll LOVE the OPA1612 dual opamp.

https://www.amazon.com/Uxcell-a14123...dp/B015E4AYU2/

https://www.amazon.com/Adapter-Conve.../dp/B01BAFFXX2

SparkFun SOIC to DIP Adapter - 8-Pin - BOB-13655 - SparkFun Electronics

SMD Adapters

https://www.amazon.com/Icstation-SMD.../dp/B01KC3M0K2

https://www.amazon.com/McIgIcM-30pcs.../dp/B074XNV6L1

I also think you'll like the AD746
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Old 28th July 2019, 03:41 AM   #1513
nano35 is offline nano35  Hong Kong
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I read an article on circuit basics site:
A Complete Guide to Design and Build a Hi-Fi LM3886 Amplifier - Circuit Basics

It is about decoupling caps for op amp power rails:
The large decoupling capacitors provide a lasting source of reserve current when the low frequency output of the amplifier is high. Larger values will improve the bass response. Typical values are between 470 F and 2200 F.

Is it true?
I have some 1000uF caps sitting around.
Maybe I should do a quick test.
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Old 28th July 2019, 04:58 AM   #1514
avdesignguru is offline avdesignguru  United States
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Quote:
Originally Posted by nano35 View Post
I read an article on circuit basics site:
A Complete Guide to Design and Build a Hi-Fi LM3886 Amplifier - Circuit Basics

It is about decoupling caps for op amp power rails:
The large decoupling capacitors provide a lasting source of reserve current when the low frequency output of the amplifier is high. Larger values will improve the bass response. Typical values are between 470 F and 2200 F.

Is it true?
I have some 1000uF caps sitting around.
Maybe I should do a quick test.
LM3886 is an audio power amplifier IC, not an opamp operated at line level.
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Old 28th July 2019, 07:59 AM   #1515
nano35 is offline nano35  Hong Kong
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Oh I see. Thank you for the explanation.
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Old 3rd August 2019, 10:12 PM   #1516
KenI is offline KenI  Canada
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"WHAMMY" Pass DIY headphone amp guide
I'd like to try the OPA1612 in the SOIC-8 package(with a DIP adaptor board) and see that Mouser has three versions available.
I'm wondering of the three,which is most suitable for the Whammy?


opa1612 Texas Instruments SOIC-8 Audio Amplifiers | Mouser Canada
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Old 4th August 2019, 09:19 AM   #1517
Alfetta87 is offline Alfetta87  France
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"WHAMMY" Pass DIY headphone amp guide
[QUOTE=KenI;5871959]I'd like to try the OPA1612 in the SOIC-8 package(with a DIP adaptor board) and see that Mouser has three versions available.
I'm wondering of the three,which is most suitable for the Whammy?

Hi, I can't see any difference, they should be the same, it's the conditioning which differs (reel or tube). You should buy the AID version I believe.

- dan
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Old 4th August 2019, 02:06 PM   #1518
Mark Johnson is offline Mark Johnson  United States
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"WHAMMY" Pass DIY headphone amp guide
Buy the 595-OPA1612AIDR whose qty=1 price is CAD 9.62
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Old 4th August 2019, 03:12 PM   #1519
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by nano35 View Post
Oh I see. Thank you for the explanation.
What explanation did you get?

Jan
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Old 4th August 2019, 04:47 PM   #1520
nano35 is offline nano35  Hong Kong
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Quote:
Originally Posted by jan.didden View Post
What explanation did you get?

Jan
Post1514 explained the large decoupling caps are for power amp, not for preamp.
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