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    Advice on Crystal Oscillators

    Hi, I am not looking for overpriced oscillator boards to upgrade your CD-Player that promise 0.1ppm. I am just looking for the xtal-cans themselves. Still the aim is upgrading a CD-Player, in my case it is 16.9344mHz. Looking @ Mouser and Digikey it looks like the best value is 10ppm. I...
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    Adding SPDIF Output to old Sony-Based Compact Disc Players - schematics attached

    Hi to all, thanks to solderdude and others, I am extremely pleased how well support in the DIY section of this forum works, especially for noobs like me. To give at least a little bit back, here is a schematic for the DAC-Nerds, developed 12 years ago with the help of people @ DIYAUDIO. This...
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    Simple Signal Delay

    I am working on an DIY-CD-player, that is mostly salvaged from an old Sony CDP + adding a modern DAC. The casing will be custom milled and has a motorized top lid that utilizes the electronics of the original tray. So far so good. But I want the design simple and not many buttons. Thus I would...
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    Advice on Filter Capacitors for this LM4780 Board

    Hi to all, I am just looking for advice on the board shown. It requires DC-voltage, but has already has 3x2200µF capacitors for each voltage rail mounted. See schematics C20/C28/C29 // C2/C13/C23 So building an unregulated power supply with recitfication and smoothing, I am wondering what...
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    Any good Anodizers - Worldwide?

    Hi to all, For years I am looking for good anodizers. I have learned a lot about aluminium alloys during the process, and in Germany where I live I have tried about a dozen of anodizers, scattered over the whole country. But almost none of them were able to finish the surface of my samples like...
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    Longetivety and long Term Reliability of Today´s Integrated Circuits

    Hi, the average age of my audio equipment is some 30+ years, the oldest being a Sony CDP-101, the most recent are a Buffalo DAC and the Khadas Tone Board. During those three decades since I bought the Sony and some other players besides lubricating gear or swapping electrolytics, not much had to...
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    Iphone 4s and Iphone 6s sound muffled compared to Iphone 4

    Now, this might be an odd request as the Iphone 4 are around for some time, but they make good DAPs and are fairly repairable. BUT: I replaced my Iphone 4 with an 4s - and the 4s sounds dull and lacks clarity. It is not like those "uhmm, I think the 4s lacks some... depth?Maybe?" impressions. It...
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