Hahaha... Awesome.. And exactly the truth..
yepper.. The WHOLE thing from power source thru regulation, thru chips and output is all one big tuned system and landing it spot on and getting those microamps of HDMI current right is a big tuned system.
Its fun stuff..
Yes right at the start I was playing with batteries. I have always loved batteries. Way back in my youth I used a 10 foot wide 4 foot tall dual stack deep of Gates lead Acid BC cells to create +-90VDC for a audio amp. Huge multiple layers of copper/silver 2" braid connecting them so a huge bank of mil-spec matched transistors for the output stage. Each amp, preamp and phono amp had its own small battery stages to make for isolated current loops. I was even crazy enough then to play with Thompson-Joule thermoelectric cooling for the phono pre and per amp stages. Nothing like lowering noise with super cooling
That whole rig was really fun but dangerous arc-flash stuff without fuses or breakers and the cooling required too much current and generated too much heat. I even had TRW make me a custom hybrid circuit on cermic for the phono pre.. That was really fun. But that was in my youth, 1982.. I did learn a lot about noise and materials with that project tho. Things like weld, never solder because of dissimilar metal crystal structure and electron flow. I used the tiny torches used for jewlery. Tricky work. I learned abut layout symmetry
I did TDR for whole circuits and did alignment that way. I was lucky back then, I sold test equipment to military and scientific industrys so I could borrow the best stuff in the world for my own home projects.
That is EXACTLY what I found. Its a trade off and picking the right number is way more interesting then you think. In fact, maybe a even more complex relationship exists where specific current draw for some operations of the CPU produces the right freq for video and some for audio. So maybe a variation in voltage fed to a PWM regulator is best
PWM regulators are a interestingly complex gate keep for electrons trying to get where they are needed. Incredibly complex very non-linear math is involved in the noise and current spectra. Those PWM gates letting juice thru, these are the gatekeepers.
I am fond of a TL431. A very old device that is quite strange and analogy.
Yes it is actually.. I should huh ? My plasma does have a tuner.. Hmm.. Good point.. What does ATSC look like on a modded platform ?
Oh idonno.. A lot of lurkers read these pages. Only a tiny percentage post. What we are discussing is interesting to lots of people watching this thread. I know for sure there are some high end engineers in these fields watching this thread. I have a LOT of these units shipped and a bunch have gone to very interesting people and places. There is SMPTE interest for example. HDMI steering comitte people who I have demoed. AV press people. Tektronix played with with ATVX. 2 units are at well known post houses. From a HDMI stand point this is all very interesting.. So our deep technical discussion does get read by people who are like us in technical depth. Plus these discussions will stay here forever for engineers later to find. My orginal hope for this product was to stir things up and get engineers to look at HDMI and stuff MUCH more closely. So these discussing hopefully further that goal.
Its good stuff.. I admit, hehehe,, discussion on which VReg is best is a topic best done on eevblog tho, hahaha..
Well SOMEONE whould make a high end linear that has senseing and works to cancle noise out to like 1Mhz. ANY maybe also has a input for a DC batt
Making a whole product from scratch is a LOT of work and I am getting to old for that kinda thing, hahaha.. All that CAD and case making and all that inventory and stuff..
Thank you
Its been a really fun project... I have always done that.. Like the CRT Proj I did or the AV rooms I made. Just kinda crazy and passionate. I look at this as my art. My paints are the parts and materials.
I donno tho... I like the short path and simple layout of the 723 die. I can get pretty insane performance from it. I do see your point of course, but I can get a 723 in a can. The can can be grounded and is a shield, plus the can can be slightly heated for thermal stability
I DO have respect for SMD if done right, I like a shorter path for EVERYTHING less metal in the path for the electrons to go thru the better in my mind. So SMD offers a much shorter TDR. I do think in terms of time domain and all the paths are reflections.
THE most difficult thingh i ever made was my siesmometer amp. I made my own. OMFG.. freq like uHZ and 1,000,000:1 gain.. The 1/f noise is a ultimate limit.. Even metal foil resistors drift.. HARD Chopper instrumentation op-amps.. Just crazy stuff..
My first experence with high end video was a Sony BVM in a telecine suite. This was stunning.. I then modded the CRT projector and equipped it with a HD-SDI input card and fed it from a Teranex for upconversion.
My real reference tho is good 70mm film on a 120" wide screen with a good lens.. My picture reference is still a really good print of Baraka on 70mm. This was so far past any electronic means of reproduction, I dont think we will ever get there.
But yes,,, your right,,, post is all now AES67. BUT, I have a ethernet switch for that
hahaha.. That *SOMEHOW* makes a difference. DO NOT ASK ME TO EXPLAIN HOW..
What I want to know,,, but its OK to decline to say,,, is what do you do as your main work ? Your clearly not a normal engineer, hahaha.. Its OK to decline to answer, I respect that.
