Pro Audio Design Forum

For a while now (and yet another thing I blame Wayne for) I've been considering EQ options for when listening to music, particularly vinyl. The problem is that, until you try something you can't be sure if it's worth having, and in the analog domain that could end up as a lot of soldering for disapp...

Let me pull mine out and have a look how its tracked. Failing that will ask Jan. That's a point. 12V to 10V reg will only have to drop 4.5V worst case with a lead acid battery. Hardly really needs to regulate much as long as it drops a couple of volts. (13V protection zener on board 9-10V recommende...

I've had confirmation that you do indeed get some hum on the lines when using a USB wall wart to power it. Most leave them on charge and unplug for use. No measurements though. You get more power out with a 9V supply which I might need due to rather a lot of relays in my future. However easily recha...

Not sure on the leakage. My plan was to leave on charge and then flip to battery for listening. I'll hunt around and see if any measurements of that were done.

I must admit to wussing out for sensitive circuits and have a couple of these https://linearaudio.nl/silentswitcher . Powered from a USB battery pack you get clean rails and no grounding issues. Total cop out, but works.

Well headed off down a rabbit hole discussing cross-talk sources and trying to work out what is most significant. Still no conclusions but an interesting data point came up trawling some old data sheets DL-107 cross-talk.JPG This is the cross-talk curve of the denon DL-107. An old design, but the sh...

OK. Perfboard here I come (assuming you have no issues with me trying to build it).

Funny you should mention the test record but a small group of us are trying to do exactly that. It's herding cats TBH mainly as the one person who knew how to specify the tests in a meaningful manner threw his toys out the pram over IP issues. We'll get there eventually :). Some has just sent me a f...

Have started fishing around for examples of recordings of left and right sweeps from people I know. I then realised that I had missed a very important consideration in my initial musings. Which is that, for a generator azimuth error it will be +ve phase on one channel and -ve phase on the other, so ...

Another idea for calibration here http://korfaudio.com/blog38

On a first read seems to have useful tests in for checking stylus azimuth but not sure it does anything for generator azimuth measuring.