Recent content by GaryB

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    A few Raspberry Pi observations

    Mike, That link is great. In particular this diagram which shows exactly what to do on my PI 2b. Through the help of online translation software, I know that it's telling you to remove the switching regulator pointed to with box #1 and then provide linear power of 5v, 3.3v, and 1.8v to the...
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    A few Raspberry Pi observations

    The Pi 2b and Moode combination was a big improvement over the Pi 2b and Ropieee SW but it still wasn't as good as the Pi 4b and Ropieee. After running it for the last 20+ hours, it just seemed to be digital and tiring to listen to after a while. Maybe I should try replacing the 2B switching...
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    A few Raspberry Pi observations

    Similar but not the same. My experience has been that the off the shelf line filters such as the TDK unit in your photograph don't work as well as a DIY unit that uses higher performance Common Mode Chokes (CMC). The Coilcraft part shown in the schematic that I posted is really pretty special...
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    A few Raspberry Pi observations

    I think I may have been hasty in writing off the Pi 2's. Over lunch I reflashed a microSD card with Moode and got it set up on the Pi 2 feeding the L-adapter powered Khadas. This is starting to sound a lot closer to the Pi 4. So Moode must do a better job of stripping down the SW to the bare...
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    A few Raspberry Pi observations

    It was discussed in the thread linked above. It's a DIY line filter which was first proposed by the late Paul Kaplan of Kaplan cables. Paul did a lot of experiments with different power line conditioners and his two favorites were the Audience Adept series of line filters and the Torus power...
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    Today's Hard-To-Classify Playlist

    Paul Simon's (failed) attempt to make it on Broadway
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    A few Raspberry Pi observations

    And the experiments continue. First I tried powering the Raspberry Pi 4 from the L-adapter linear supply, with the output voltage set to 5.1v. Interestingly, I found that this was a slight step down in quality from the Cana switching supply. I should point out that I use a good power line...
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    A few Raspberry Pi observations

    The power supply is a diy unit based on a design over at diyaudio called the L-adapter. It's easy to adjust the output voltage anywhere from 1.5v to 20v, depending upon the transformer that one uses. I use it with a 6.3v r-core transformer, which allows me to set the output to 6.1v for the...
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    A few Raspberry Pi observations

    I've been following the discussions on the Raspberry Pi as an inexpensive endpoint but never had a chance to try one. I currently use a Sonore Microrendu feeding a Khadas dac and I wanted to see how close one can get to the Sonore Microrendu. I had a Raspberry Pi 2B sitting around and I just...
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    USB Oscilloscopes

    You can pick up the cheapest Picoscope at Newark for $115. Add another $15 - $20 for a couple of probes from Amazon and you're good to go. Admittedly it's only a 10Mhz scope but that's probably good enough for the majority of audio work. As I said earlier, I haven't used this setup but I've...
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    USB Oscilloscopes

    Heard good things about Picoscope but haven’t used one.
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    Cleaning out the bookshelves - Old issues of Stereophile

    My local library gets Stereophile and tosses all the issues after 1 year. In case it wasn't clear, I'm not looking to make much money off of this. Just enough to make it worth my while to not throw them away. I'm open to counteroffers if people think I've priced things incorrectly. Anyone...
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    Cleaning out the bookshelves - Old issues of Stereophile

    Any interest in old copies of Stereophile? The recent discussion about the value of modern audiophile magazines or lack thereof, made me take a look at my old collection. It's been almost a decade since I stopped subscribing (except for a brief relapse in 2016) but I have over 15 years of old...
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    Death by tone-deaf.

    It's not a coincidence that this happened just as the internet took off. The democratization of information means that we're now inundated with self-appointed experts and reviewers willing to share their opinions on what we should buy. I don't need Stereophile to tell me what's the best way to...
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    FS: Tango XE-20S output transformers for SET amp

    These are great transformers. I hope that someone picks them up for a project - they'll be happy they did. In case anyone is interested in the history of Tango transformers, they were the favorite of many of the people who helped restart the single ended amplifier craze in the 1990s. The...
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