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Nice :) Although reading python is like sticking forks in your eyes. A lot of the loops would disappear with vectorisation if you used Octave (Matlab clone).

Interesting: https://patents.google.com/patent/US6307490B1/en It appears that that Trimming R2R patent from 1999 has now just expired :D I suspect that we will see a few more R2R with trimming appearing - reducing the non-linearities.

People buy different amps because it sounds better to them - op amp rolling is no different. How much of that is surjective is a different thing - hard cold measurement is the only way, then pick your poison based of ear or graph!

Hi sorry I’m not in the same league as most of you :) my stuff was bought in 1998 Musical Fidelity A220 Myriad MC100 (1996 single bit DAC variant). Castle Harlechs Too short of space and the Mrs and I have very different musical tastesso most of the time it’s Mac mini + AGK 240mkII. Looking...

Ok, I've costed up the options.. Soekris' offering (for the hardware) is good with the OEM - and the new board with sign-magnatude certainly looks good. I've modelled some of the filters in Octave - I see that Soekris uses a zero insertion upsample which is a neat touch with 67bit adder and...

Let me break out Jupiter notebook octave. I can then simulate it. python using scipy, pySPICE (ngspice) would work. Seems ngspice has a Monte Carlo simulation which could work well for R2R tolerances.

I’d started reading these in relation; https://www.analog.com/media/cn/training-seminars/tutorials/MT-017.pdf http://www.ti.com/lit/an/sbaa230/sbaa230.pdf https://www.maximintegrated.com/en/design/technical-documents/app-notes/3/3853.html for Astro work, the images are seen as 2D (separable...

Ok will have a read - thank you for taking the time to respond. Low pass sinc, I assume the part of the idea is to compensate for constant ladder pwm characteristics by applying the filter to the input. Will have a look into it. it should be possible to connect the input and output to an...

One thing looking at what I’ve written - changing the TL074 to a OPA165x is that may be better for the active low pass filter, although I would check the maximum slew rate based on say a 20KHz tone (transition slope wouldn’t be vertical) with a full transition from 0 to 3.3V. TL074 slew rate is...

Hi, I’m looking to build a usb pcm-r2r ladder headphone amp. 32bit/192kHz linear pcm input (OSX provides transcoding). My background university degree in parallel and distributed systems, along with embedded formal systems, GPU Astro image processing deconvolution using DFT, and I for the last 6...