I started using this Blog-Site subdomain from dddac.com to blog my audio adventures 🙂 I will be starting to post here several topics and projects. As I have some projects done in the past, it will not be all very chronological, but more what I like to show for now – It will be…
Today Tests What’s on the menu today? A short meal this time, but hopefully as interesting as short 🙂 “Jürgens” Clock – with thanks to Mamal from Berlin Listening to the possible impact of power supply to the Andrea Clock Jürgens Clock Mamal from Berlin wrote me an email after reading the earlier posts…
The test goes on… This time mostly thanks to Stefan Wapstra, who was so kind to send me three 45Mhz Clocks. The First version of Andrea’s DRIXO Driscoll clock PCB, a Crystek CCHD-957-25 and the standard Clock delivered with the FiFoPi Q3. Next to those I had the Accusilicon Clocks 318 and 338 warmed…
Follow up from the earlier Post! In the earlier post I went into a lot of detail on this topic, so you might want to refer this post as well. In this second part I wanted to compare the new Accusilicon 338. I now finally received these with the Chinese parcel service but still…
More background on this special DDDAC output transformer (OPT) Already in the very early days of the DDDAC I wanted to be able to use the PCM1794 to it full content in Mono Mode by means of an OPT. This would give the following benefits: Effectively doubling the number of DACs (like doubling the…
Introduction Are we in agreement, that DACs are sounding better when a good quality low phase noise clock is being used? Yes? keep reading… There is a lot of information and good articles on this topic, so I will keep it brief and not go in all possible backgrounds of phase noise, clocks and…
A fresh new setup after 15 years… Now that I will spend more time in my work shop, it was about time to get things fresh and renewed. After many (15) years of organic and chaotic growth I wanted to get things more organized and all test equipment and work space more handy. Well…
A small update from the DDDAC world It is hard to be consistent in ones blogging I must admit. LOL, I thought I would be constantly blogging after I quit my busy day job one month ago. I spent the March month to pick up on many things which were lying around in my…
Introduction Inspired by the many reports on the audiophile improvements when using UltraCaps (or super capacitors) in Audio applications, I decided it was time to start looking into this subject myself. For starters I wanted do some tests with it on my own DDDAC. Of course I am also interested in the technical aspects…
Introduction Here you see the well known DDDAC Power supply. I designed it to go together with the DDAC1794 kits, Of course it can also be use for many other audio applications. As DDDAC kit it comes as “5V” or “12V” version. As it is adjustable, the range is a bit wider than that…
Introduction We all know these FFT plots with a noise pattern. I see them all the time in Forums and other websites. The term Noise floor is always close… But is that also the Signal to Noise ratio (S/N ratio)? Or is this the noise voltage output from a voltage regulator for example? NO…
And how PCB capacitance spoiled the fist version… As you might have read, I am working on designing and building a tape head tube amplifier. For this you need quite some overall gain to overcome the gain losses in the equalization filter. Like at least 200.000; reason to split it up in 3 stages….
Introduction For many years now, I have been using Dick’s (Audio Creative) N30P Mu Stage Design. He called it the Cleo 6. It is a great double mono MU-Stage amplifier (see circuits) with top components. Over the years I started to see the benefit of using Arduino computer boards as a control tool, so…
Sometimes pictures tell more than a thousand words… Here is a nice photo story of the construction of my CLEO 7Tube Pre Amplifier
Somehow I feel, that this should not be necessary, but experience shows that this WARNING is absolutely needed over and over again… All my projects are working with high voltages. 230V AC mains or even over 500 Volt DC voltage in tube amplifiers. These voltages does not only hurt like hell if you touch…
As mentioned in the earlier PR99 blog, I wanted to design and build a universal tape head amplifier. Just for fun and to see what I could squeeze out of the magnetic source, avoiding the internal Revox electronics. Which sounds great, but honestly I still do not get it as it is full with…
Rediscovering Reel to Reel I recently re-discovered the joy of Reel to Reel music reproduction. I started with an old, somewhat refurbished 4 track NAB Revox B77 with 3.75 and 7.5 ips speed. I use this one for the simple work, experimenting with electronics and playing the wonderful old pre recorded tapes from the…
This is just a gallery – It speaks for itself I hope 😉 – I will add text later (Still lots of WIP for my blogging site !) Views: 495