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Showing content with the highest reputation on 11/12/2023 in all areas
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Chassis Mocked up. Still mostly empty. Definitely will need to trim the lips of the top and bottom plates of the PSU chassis to fit the IEC block's trim, but otherwise extremely happy. Not sure if I've mentioned but this is just a one-off for personal use. Definitely a huge setup, and doesn't come close to the refinement of many of your amazing builds, but for the first headphone amp I've built from scratch, (RIGHT to the deep end, haha!) I'm pretty content so far. haha! Not pictured, JAE DC connectors, Neutrik XLR inputs, CMC Rhodium 5-ways.3 points
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I have another post identical to the one I just made, but first it's a detour into a nightmare. I've known two guys named Eddy and Jair for over 20 years now. Of all the photographers I know, Eddy is the one whose work is going to end up in a museum. He does one thing and does it well. He takes street portraits with medium and large format film. He's also bipolar AF, drinks and smokes heavily, and is morbidly obese. I like Eddy a lot, but I recognize he's not going to live forever. You should check out his work while he's still around. The January of 2007, Eddy and Jair were walking through the woods and stumbled upon some hunter's Bushnell remote game camera. Being they miscreant teenagers (they were actually 20 at the time) that they were, they ganked it. The trail camera produced really noisy, crappy 640x480 images. It also had some serious rolling shutter issues, which were not normally a problem on a camera that's not supposed to move. During that January, Eddy took, or more to the point, the CAMERA took a bunch of weird and very bad photos. There's no shutter control on trail cameras. Just a few settings, either motion activated or timed. I think one shot every 5 seconds was the fastest. I ran a select few of the images through Topaz GigaPixel AI and in a couple cases Topaz DeNoise AI as well, but did almost no other edits to them: This is the moment the pair stumbled on to the camera. It's like something out of a found footage horror film. That will be a recurring theme. Two self portraits Eddy took in the bathroom mirror after he got the camera home. There's a very strong rolling shutter effect on the second one. A triptych taken during one of their many visits to the remains of the infamous Belchertown State School. The grounds were very accessible in the mid 00s. These are demonstrably terrible photos, but there's something about the lo-fi horror movie aesthetic they have that I quite like. The testarossa in them is Eddy's younger sister Rosie, who is a bit of a nightmare herself.3 points
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Suggestion - instead of trimming the lids to get the IEC to fit, why not 3d print a spacer? Be a shame to risk mangling an otherwise pristine set of cases. Looks like you only need a mm or two.1 point
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RIP astronaut Frank Borman, 95 https://www.npr.org/2023/11/09/953342565/nasa-apollo-gemini-astronaut-frank-borman-dies1 point
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Normally around Thanksgiving in years past, Modushop has done a sale at something like 20% off. A couple of years ago, they included the customizations in that sale, which is where they get expensive with the machining, anodizing, etc. I did my DynaFET and Salas FSP cases on one of those. Still not cheap, but probably quite a bit cheaper than finding a CNC machine shop, designing your own cases, etc. as Kevin did for the T2's.1 point
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my two smd amps with bivar leds running at 20 volts and led vf 1.71 volt, i also would go down a tad with the bias to around 15ma. second one (the one in your list) with 16.5 ma / 81c max after 2 hours - ok but on the edge. so i would use next time r14/29 around 210 ohm for bivar leds and 402 ohm r1/r3. this is my second one, a lot of holes top and bottom, printed front and rear, whitout potentiometer, additional 4.4mm output. i use this one for travel together with a dap: my first amp only with small heatsink in the group buy case (with r14/29 240 ohm) was around 100c max and even discolored the pcb a bit. more holes (best over 4mm diameter) and a heatsink lowered the temp to around 80c. if they get hot the bias rise quite fast even when the start bias is relative ok or low. but i love them, like the sound better then my big dynalo, i now use on both from trendsetter - linear integrated systems matched lsk489 lsj689 jfets.1 point