[sdiy] Elektron Digitakt teardown

[Peter Hutt]

Thanks for sharing, really interesting.

On Sun, Jul 9, 2017 at 10:44 AM, Julian Schmidt <elfenjunge at gmx.net> wrote:

> Hey list,
>
> found in the mutable forums, some pics and comments of the digitakt guts:
> https://www.flickr.com/photos/128743207@N08/sets/72157683648770700
>
> "Compared to the "Analog" series devices from Elektron, there are a couple
> of changes.
>
>    - The new "encoders" are actually potentiometers (probably sin/cos).
>    That's very clever.
>    - The "Analog"-series devices had a USB isolation to avoid having a
>    ground loop when the device is connected to a computer and an audio
>    interface. The USB isolation chip was removed. Instead, there is now an
>    isolation between the analog side and the digital side of the circuits. The
>    power rails and grounds for the analog and digital sides are entirely
>    isolated. That way, ground loops are still prevented, but in addition
>    digital noise is kept away from the analog circuity much better.
>    - The magnetic NVRAM that was used in the "Analog"-series devices was
>    removed (probably too expensive and too small - the largest available on
>    the market is currently 16Mbit). Instead, they use a 1Gbit DDR2 SDRAM
>    powered from a Supercap. So, effectively you get the "persistent" memory
>    (no loss of data when power-cycling, even without saving your project) but
>    it porbably won't last 20 years like the magnetic NVRAM
>    - The new switches are computer keyboard switches from Kailh -
>    apparently that is a "Cherry MX" clone.
>    - The type of OLED display is unfortunately not visible without
>    desoldering it from the pcb.
>    - They are still using a coldfire processor. To my understanding, that
>    is pretty comparable to the higher STM32F7 devices (maybe a slightly
>    faster) but interestingly the SRAM on those is only 64kB."
>
>
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