ePot.V3 Max & Mini Stepped Attenuators & Preamp Controllers

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tortugaranger

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Re: ePot.V3 Max & Mini Stepped Attenuators & Preamp Controllers
« Reply #40 on: 27 Aug 2020, 03:28 pm »
Hi All,

1st round of product pics for the ePot.V3 Max Stepped Attenuator & Preamp Controller are in.

Product Page: https://tortugaaudio.com/products/diy-preamp-components/electronic-stepped-attenuator-epot-v3-max/

Cheers,
Morten







glynnw

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Re: ePot.V3 Max & Mini Stepped Attenuators & Preamp Controllers
« Reply #41 on: 27 Aug 2020, 08:01 pm »
I believe you said that the mini lacked the calibration feature.  Mine goes weird about once a year and recalibration always sets it right again. What does one do when a mini goes wonky?

audiobasic2000

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Re: ePot.V3 Max & Mini Stepped Attenuators & Preamp Controllers
« Reply #42 on: 27 Aug 2020, 09:24 pm »
Good Afternoon, glynnw:

From the Tortuga mini ePot v3 web page...

'About LDR impedance and calibration

Due to its small size, the Mini is not capable of calibrating its own LDR attenuation module. Therefore is you need an LDR attenuation module with a difference impedance level or to replace a bad module you will need to purchase LDR modules from Tortuga Audio. Alternatively, if you also own an ePot.V3 Max you can use any Max to recalibrate any LDR module at whatever impedance level you wish. If you send in your existing V3 LDR attenuation module, we will recalibrate your module for you for a  $5 fee plus return shipping.

For more general information, please refer to this link to read more about LDRs, their impedance and their calibration.'

Hope tortugaranger (Morton) doesn't mind my quoting a subsection of the web page.

glynnw, were you a beta tester or something? My understanding is that the min ePot v3 has only been recently introduced and in production-wise. Reason is I have one on the way and if what you indicate about the drift would cause one to be concerned if they do not have the requisite Max but can opt to send it back to have it re-calibrated.  :scratch:

Thanks.

Sincerely,
Kingsley.

glynnw

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Re: ePot.V3 Max & Mini Stepped Attenuators & Preamp Controllers
« Reply #43 on: 27 Aug 2020, 09:38 pm »
Thanks Kingsley - Not a beta tester.  I recently had my Tortuga balance go south and easily corrected it by recalibrating.  I have a preamp kit coming from DIYaudiostore and if I like it I am thinking of replacing it's volume control with a Tortuga unit, which are the best I have ever heard.  Looking at the mini it looks like an easy way to do it, but was just wondering about what the larger unit might offer me that the mini doesn't and the calibration issue came to mind.  So I asked.  Will not know what I plan to do until I build the kit and see what kind of space I may have around the volume control.  The mini seems like such as perfect solution in this case.  Since I also plan on ordering one of your passive kits when it becomes avaiable,I can use it to recalibrate the mini.  Sweet!
Thanks again.

audiobasic2000

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Re: ePot.V3 Max & Mini Stepped Attenuators & Preamp Controllers
« Reply #44 on: 27 Aug 2020, 11:20 pm »
You're welcome, glynnw. By the way, I think you meant to order one of Tortuga Audio's passive kits? (I certainly don't sell any - LOL.)

tortugaranger

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Re: ePot.V3 Max & Mini Stepped Attenuators & Preamp Controllers
« Reply #45 on: 29 Aug 2020, 04:46 pm »
I believe you said that the mini lacked the calibration feature.  Mine goes weird about once a year and recalibration always sets it right again. What does one do when a mini goes wonky?


What Kingsley said.  8)
And to my ears the V3 model is our best ever sonically. Hope you give it try and let us know your impressions.


Cheers,
Morten


tortugaranger

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Re: ePot.V3 Max & Mini Stepped Attenuators & Preamp Controllers
« Reply #46 on: 11 Sep 2020, 05:35 pm »
Hi All,

I quick update on the roll out of the ePot.V3 Mini and Max.

We began shipping Mini's around the last week of August while still working on finishing up a couple of loose ends with the Max. We received feedback from a couple of customers (who loved the sound quality BTW) that the Mini would freeze while turning the encoder. So we got all over that issue and after extensive diagnostics traced the freeze problem to the power supply.

Throughout months of development, we never heavily manipulated the encoder beyond verifying that it worked at all. The rest of the time we used the remote. Turns out active use of the encoder was causing voltage transients on the 3.3V bus powering the microcontroller. And while the microcontroller tolerated this almost all the time, sometimes it didn't and decided to just quit running. I was sure it was a software problem up until the moment it became clear it was a power supply problem. We'd never had a similar problem with earlier models so we weren't looking closely at this during development.

The issue was easily resolved by beefing up the 3.3V system with a larger cap which mitigated the transients. No more freezing up.

Those of you who already have a Mini have been contacted (or will be shortly) and we'll be swapping out your Mini for a new one with the fix in place. We'll retrofit the returns once we have them back in our shop.

We held up sending out any Max units until this issue was resolved but are shipping them now since the same issue applies to the Max but somewhat surprisingly the Max was less susceptible to freezing; probably because the chip is much bigger physically and thus has more inherent power capacitance internally.

Otherwise the Mini and Max are working great and initial feedback on the Mini has been very positive.

Cheers,
Morten