Hi X,
glad you feel better, I wish you quick and full recovery.
Thanks for the music - album ordered 👍
Thanks and happy to be able to share music ideas with you guys. Please let me know if you have a favorite as well.
Dangerous invitation - I have so many favorites, and it keeps growing.
Sometimes I like a simple song (simple melody and only a few instruments) to appreciate good sound. Try this instrumental one:
Wolk by Belgium group Dans Dans
I see it on youtube
kind of reminds me of my favorite song in the Doom Jazz genre that I found while trying to find similar music to the L.A. Noire video game soundtrack
kind of reminds me of my favorite song in the Doom Jazz genre that I found while trying to find similar music to the L.A. Noire video game soundtrack
Just came back upstairs from working on a Carver C-9 Sonic Hologram unit. Got a few more parts to install and then it's off to sell.
I actually did something, no soldering needed but I was happy to get the SMPS out and put in a linear power supply in my eversolo dmp a6
Is that a manufacturer provided swap? Or was the board a DIY? It looks really clean.
One thing that SMPS can provide is great elimination of 60Hz hum. It’s basically a transformer but instead of 60Hz mains it oscillates at probably 100kHz to 400kHz where you can’t hear it. The trick is to filter that high stuff out with a good CLC filter.
For my upcoming LSA Phono-01 preamp product, we wanted an ultra low noise power supply for the most critical phono headamp MM/MC preamp stage. We used a SMPS (AC/DC) module from Recom +/-340mA +/-15v. Followed by a tiny SMT CLC where the L is a common mode CMC and a ferrite bead L. This is then followed by low noise linear regulators.
I had a spare PSU module and used it for my headphone amp and that worked out well. Also, not having a 60Hz transformer lying around reduces radiated 60Hz EMI.
Of course, I am also not one to say you can’t make a nice low noise PSU using a linear toroidal transformer, an active bridge, followed by a CLC, then followed by an ultra low noise linear regulator - a la Yarra Mk1 PSU board:
But this thing is way expensive to make in parts cost alone.
One thing that SMPS can provide is great elimination of 60Hz hum. It’s basically a transformer but instead of 60Hz mains it oscillates at probably 100kHz to 400kHz where you can’t hear it. The trick is to filter that high stuff out with a good CLC filter.
For my upcoming LSA Phono-01 preamp product, we wanted an ultra low noise power supply for the most critical phono headamp MM/MC preamp stage. We used a SMPS (AC/DC) module from Recom +/-340mA +/-15v. Followed by a tiny SMT CLC where the L is a common mode CMC and a ferrite bead L. This is then followed by low noise linear regulators.
I had a spare PSU module and used it for my headphone amp and that worked out well. Also, not having a 60Hz transformer lying around reduces radiated 60Hz EMI.
Of course, I am also not one to say you can’t make a nice low noise PSU using a linear toroidal transformer, an active bridge, followed by a CLC, then followed by an ultra low noise linear regulator - a la Yarra Mk1 PSU board:
But this thing is way expensive to make in parts cost alone.
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It’s a third party LPS made for the Eversolo by LHY. I think LHY is Alvin from vinshine audio’s personal brand. He releases niche products of dubious necessity like this power supply upgrade, external clocks under this name. I’m sure not all switching mode power supplies shoot high frequency noise in all directions causing mysterious listening fatigue the way audiophile myth says but since I plan to use the Eversolo as both a streamer, dac and preamp connected to the Verafi A40 I wanted to upgrade it as much as possible
On the (messy) bench tonight is a multistage power line filter I am developing. I tested it out by injecting 400kHz 1.7vpp noise into the inlet and the outlet (scope on highest 10mV/div) showed nothing. Like a black hole of noise.
Test setup with 4 stage filter:
Voltage at inlet (500mV/Div):
Voltage at outlet (10mV/Div):
Now that I can see this technique works with my own eyes (just LTSpice sims before), I am going to optimize a filter to have similar performance starting with -40dB at 2kHz and -80dB at 100kHz and above.
Test setup with 4 stage filter:
Voltage at inlet (500mV/Div):
Voltage at outlet (10mV/Div):
Now that I can see this technique works with my own eyes (just LTSpice sims before), I am going to optimize a filter to have similar performance starting with -40dB at 2kHz and -80dB at 100kHz and above.
On the bench tonight is testing the Desktop Diamond Buffer headphone amp using REW and Victor’s oscillator.
The high bias current of 78mA gives a nice harmonic profile with only H2 and H3 at 1.00Vrms into 33ohms:
The high bias current of 78mA gives a nice harmonic profile with only H2 and H3 at 1.00Vrms into 33ohms:
On the bench is my old school (meaning not a smartphone) camera is getting an optical backup VF for shooting with camera up to the eye. I ordered one of these external hot shoe 40mm viewfinders for my rangefinder style 4/3rds format camera. Unfortunately, the image alignment is way off (10deg at least to the right). Making it unusable. Good thing it only cost $10.
Centered in VF but camera points to the right so center is shifted to left.
Looks cool though.
I want to start using a camera again purposefully to take candid portraits of family. The iPhone takes incredible pix (and the auto white balance and AI based dynamic range compression can’t be beat). But you don’t have the out of focus bokeh that only a real F/1.7 longer focus lens can provide.
Centered in VF but camera points to the right so center is shifted to left.
Looks cool though.
I want to start using a camera again purposefully to take candid portraits of family. The iPhone takes incredible pix (and the auto white balance and AI based dynamic range compression can’t be beat). But you don’t have the out of focus bokeh that only a real F/1.7 longer focus lens can provide.
A quality glass finder for a Voigtlander costs more than a mint condition used Lumix GX1 body! Crazy.
I remember the plastic viewfinders in old disposable film cameras actually being quite good and clear and were aligned. I could probably pull one from a disposable camera body and make my own housing on a printer.
I remember the plastic viewfinders in old disposable film cameras actually being quite good and clear and were aligned. I could probably pull one from a disposable camera body and make my own housing on a printer.
On the bench 10 years ago in my lab, there was no bench! I worked on the carpeted floor in fact. This was Dec 27. 2013. I did mostly foam core speakers and Akabak simulations back then. The view here is the wall where I now have the rack of amplifiers and speakers. Here is a collection of many of the foam core creations back then. I remember when I got an old kitchen table down there it made a big difference.
And on the lab bench 20 years ago, I was not into audio yet (not until 2012), so here is my optical bench at work - a laser Raman spectroscopy setup to measure chemical species and temperature inside a high pressure aircraft engine combustion chamber. That was actually a lot of fun too. Expensive toys though. The big box with all the laser beams and mirrors is a ring cavity laser “pulse stretcher.”
And on the lab bench 20 years ago, I was not into audio yet (not until 2012), so here is my optical bench at work - a laser Raman spectroscopy setup to measure chemical species and temperature inside a high pressure aircraft engine combustion chamber. That was actually a lot of fun too. Expensive toys though. The big box with all the laser beams and mirrors is a ring cavity laser “pulse stretcher.”
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I always wanted to make Cryogenic Rocket Engine with Thrust Vectoring and Variable Thrust when i was kid, wanted to send my lEGO Man to Moon.
Why Thrust vectoring? TO do dog fight with Aliens in space.
I didn't succeed making cryogenic engine at age of 9 , but endeavor definitely turned me into a nerd.
Why Thrust vectoring? TO do dog fight with Aliens in space.
I didn't succeed making cryogenic engine at age of 9 , but endeavor definitely turned me into a nerd.