ePot.V4 LDR Attenuator/Controller, Buffer & Power Supply

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tortugaranger

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Re: ePot.V4 LDR Attenuator/Controller, Buffer & Power Supply
« Reply #20 on: 25 Oct 2023, 08:51 pm »
Interesting development Morten, I can't wait to see the V4 come to life, but I am curious about two implications of this new design change. Pico's onboard ADC is 12 bit, does this mean you are giving up on the idea of having 16bit ADC in V4? Also, is there a threat of potential RF interference from the Pico's onboard wireless and bluetooth chips?

Thanks!

The V4 will not be using the PICO's 12 bit ADC. The V4 has a separate dedicated 4 channel 16 bit ADC chip used only for calibration plus a 4 channel 12 bit DAC chip used for both LDR calibration and LDR control during normal operation. The V3 had the opposite - a 12 bit ADC and a 16 bit DAC. In hindsight, I believe accurate measurement is more important than more granular control provided the 12 bit DAC control is monotonic and repeatable which is it. I'm tweaking the LDR calibration algorithm somewhat as well to further optimize around the 12 bit DAC while taking full advantage of 16 bit ADC.

In the event using the PICO's WiFi or Bluetooth creates any problems, I simply won't use them. Initially they'll both be dormant until such time as I've come up with remote control solution that warrants their use.

tortugaranger

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Re: ePot.V4 LDR Attenuator/Controller, Buffer & Power Supply
« Reply #21 on: 9 Jan 2024, 09:02 pm »
Hi All,

I just published the first working draft of the V4 Hardware Manual which is now available online in our online documents section via this link: https://tortugaaudio.com/docs/epotv4-max-hardware-manual/

As the V4 remains under active development, there will likely be numerous changes to the manual over the next several weeks until the V4 is finally released. But those curious about the details of the V4, it's a fairly comprehensive description of the V4 Max hardware so far.

Cheers,
Morten


P.S.  We are currently having snowmageddon here in Bend, Oregon with probably a foot or more white stuff by tomorrow.

wgraft5

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Re: ePot.V4 LDR Attenuator/Controller, Buffer & Power Supply
« Reply #22 on: 9 Jan 2024, 11:03 pm »
Hi All, P.S.  We are currently having snowmageddon here in Bend, Oregon with probably a foot or more white stuff by tomorrow.

Central Oregon will do that, then the sun will come out melt it and then Slushageddon! It freezes at night so then its Iceageddon and so on. lol Lived in the Bend area for 10 years or so. Back in the valley now. LOL

Wayne in Oregon

stvnharr

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Re: ePot.V4 LDR Attenuator/Controller, Buffer & Power Supply
« Reply #23 on: 12 Jan 2024, 09:16 pm »
Looking forward to when the V4 comes out, when it comes out. I can do balanced without issues then.

tortugaranger

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Re: ePot.V4 LDR Attenuator/Controller, Buffer & Power Supply
« Reply #24 on: 19 Jan 2024, 11:27 pm »
Hi All,

I've now published a draft manual for the new optional plug-in V4 Solid State Buffer Module (SSBM.V4) that mounts directly to the new V4 Max board. Treat it as a working draft since changes are inevitable.

https://tortugaaudio.com/docs/epotv4-max-hardware-manual-copy/

The buffer module converts the V4 Max from a passive preamp/attenuator into an active version with optional gain (up to +12 dB) by simply pugging the buffer module into the same socket on the Max as the LDR Module. Then the LDR Module plugs into the buffer module such that you end up with a 3-layer board arrangement that looks roughly like the diagram below.

The buffer module design is an evolution of my earlier stand alone buffer board which has been in circulation for the past 3 years or so and has performed well.