Leaderboard

Here's a new layout I'm working on. It's a GR HV/LV, Bias and Delay circuit (with LED flasher) all on one 4 layer board (3.5" x 5.5"). The pass devices can mount to the bottom plate or a heatsink. Mostly SMD parts and uses the GR78/9xx modules. Once tested I'll make this all available.

I expect to now be able to spend significant amounts of time on new designs

Well the new 100/100 fiber at home seems to be working..

Loving the knob

astroglide is just retarded so why waste energy on him? He takes being clueless to new heights... As for the amp...I bet it is just a 727 with tube input but who knows what they are up to. Looks to be a completely unregulated PSU as usual with just the LV rails and tube heater being regulated. That could work if you manage the backwave. Well they were LNS drivers as they are way better than the 404 crap... They are still attached to the HE90 baffles though as the plan is to make a clone of the HE90 shells one of these days and use them in it. Add some slight angle to the drivers and the end result would be far better than the stock stuff.

Las Vegas. I can go to Five Guys anytime and don't. If I lived here, would probably never go. It's a HC thing for me since first time was with a bunch of you guys. Sent from my iPhone using Tapatalk

Here's something that has been cooking for a while... what happens when you take some heavily tweaked SR-X Mk3 normal bias drivers, an old SR-303 cable, some earpads from Belarus and a cheap Beyer clone from China? Something that is actually pretty decent... Now the drivers are actually Pro bias if that wasn't clear but this one fun sounding set of headphones. Off the Carbon CC it has that lovely tuneful bass the SR-X Mk3 Pro has but this one has far more body to it. The voices are sublime and have that SR-X quality to them without the over damped nature of the originals. The highs a tad too lively but that will be tweaked in version 2.0. Over all...I'm a happy bunny for spending next to nothing one these... It's fun to play with this stuff and see what comes of it.

Phrasing!

A number of years ago I rented a bike and rode out to Red Rocks with my wife. That's a great place. Sent from my SAMSUNG-SM-G890A using Tapatalk

If you are going to have AC, might as well be a heat pump. They are very efficient with some caveats. The BTU output is typically matched to the house size for AC to prevent re-evaporation or short run times. This produces long very long run times in winter to the extent that most home setups reach a balance point around 15-18F where the losses in the house exceed the BTU output and you get 100% run. In Maryland (Where I live) this rarely happens and heat pumps typically keep the house at whatever temp you set the thermostat at without calling for "backup" below the balance point. In the event the heat pump can not keep up (18F for my setup), backup is called. For me, that is electric, which is wicked expensive. In the north, I'd expect the backup system is something other than electric, probably natural gas. Usually when non-electric backup is used, there is an outdoor thermostat that can be set to just swap over the heat pump to the backup (not run both at same time). This is pretty convenient and you can set it at something nice like 25F or so and minimize long run times and maximize your furnace "backup". Heat pumps have an outdoor unit that gets colder than the ambient air in winter (heat) mode. This will cause frost on the outdoor unit. In humid areas (coastal) this frost can be excessive. Most units have a "Defrost Cycle" to get rid of the frost. The way this works is by automatically running the AC (and turning off the outdoor fan) for a few minutes every hour to move heat from the house to the outdoor coils and melt the ice. Some use a sensor to do this rather than a timer. Either way, when it happens, it blows cold air through the house, which many people totally hate. The backup heat is used to minimize the chill, but most people notice it (Dusty Chalks "Heat Suck!"). I'm a heat pump fan, but I'm not sure I would be in Chicago unless I had a good backup. In Maryland, the typical way we do Geothermal is to drill auxiliary wells into the shallow aquifer here. It's cheaper and more efficient than a horizontal trench system.

Not my favorite place. Here for work. I did a nice hike today at Red Rocks Canyon. If my back settles down I will do another tomorrow after the deposition. I need to find a good coffee shop near where I'm staying. Sent from my iPhone using Tapatalk

Kevin's house is filled with crap already so yeah...this might end badly. He even complained when I was digging through his box of unpopulated PCB's that I was messing up "his filing system"... Seriously though, I spent a week there and I doubt I saw all of it. I think I have more headphones though...

no local 5guys, eh?

a room full of amplifiers?? ask birgir. how about 3600 square feet of amplifiers.

Found this burger place. Anyone been? Sent from my iPhone using Tapatalk

i have turned in my retirement notice, so my file server probably won't be up for more than a couple of weeks, get copies now. i have a complete backup and will be moving to my own domain soon.

"One of the oldest videos on the internet."

Frankly I don't care I love my Birgir Carbon, been using it for the last 6 hours solid, time for bed in Tokyo.

i suppose that should work. as long as all the parts are rated for the voltages you want to use

Mmmm, that's a tasty burger *slurps Sprite.*

fair enough. Sorry about vegas.

They all look exactly the same so I might have been to that one.

Nope, never sold that one. Now fitted with real HE90 drivers and never used as they now suck...

Not true anymore, Dan, at least with some units. The Bosch unit that we just had installed in the addition is reasonably efficient down to -15F and provides both heat and AC.

Not sure if this applies to your situation, but when we were considering HE boilers versus older ones, we found that the expected life (and the warranty) of the HE unit was about half as long (10 vs 20 years), and was just long enough such that just as it paid for itself, it was likely going to need replacement. Meaning that over time it would cost 2x as much and, in an effort to move from 90% to 95% efficiency, it would result in an extra boiler being dumped in a landfill.

Note that slack is more persistent than chat so you're talking to all current and future participants.

Congrats! But that'll just mean an even bigger backlog of unpopulated boards, or a room full of amplifiers that you have to hide from your spouse...

Congrat, and happy birthday!

Nope, Birgir's gonna start a museum of headphones the manifacturers SHOULD HAVE BUILT.......... His next mission will be to buy back the Orpheus with the 404 Drivers he sold, as an example of what Sennheiser should have done

.... and you ended up with CO2 right.......? I used one to make a negative ion generator. There were about 5 of us working in a closed room with only 2 doors, no windows with a bunch of printers being repaired and tested. By mid afternoon most of us were getting very drowsy. I built a negative ion generator and installed in a cardboard box and placed it on a cupboard, and it really did wonders. One day an engineer came in and asked what was in the box with the 5 needles sticking out. The boys told him what it was and dobbed me in as the builder. I was then called up to explain the deal. When I finished, the engineer told me it was all a lot of rubbish. After everyone assured him it wasn't, he asked how I knew it was pumping out negative ions, and not positive ones. I explained that it was dependent upon the direction of the diodes. He demanded to know how much voltage it was pumping out and how we could test it. I produced an Anderson static tester and gave it to him. He pointed it at the generator and it read 4KV positive and gave me a very surly look. I pointed out to him that you need to calibrate the tester first and then take a reading. When I showed him how it was done, he took another reading, which read just over 6KV.negative as specified. He then got all huffy and told us to go out and get a commercial one. We all ignored the demand and went back to work. As a back note to his, A few years later I had reason to go to a Sagem factory (French exocet missile producer) to look at their premises where they were assembling and testing telex machines. They had this long bench about 50 metres long with finished machines running under test. I noticed that they had 3 negative ion generators fixed to the ceiling. I asked the manager what he thought of them, and he said that it was the best things they did to the place.

Just like Carbon we built. Same box, same PS. Relay=120s. Separated filament transformer.

A bit more information on why USB audio quality varies: http://www.digitalaudioreview.net/2016/05/gordon-rankin-on-why-usb-audio-quality-varies/