renormalizer

@renormalizer@feddit.de

• ⁨Comment⁩ on ⁨Help creating a BoM for the Ring Accelerator?⁩ ⁨⁨7⁩ ⁨months⁩ ago⁩:

  IIRC, the first model ate mosfets for breakfast because the photo resistor is way too slow going from illuminated to dark. That leaves the mosfet in a fairly high resistance state for an extended amount of time during which it dissipates a lot of power. You should add some kind of Schmitt trigger inverter that buffers the resistive divider and gives you a clean narrow edge to drive the mosfet gate. A 74HCT04 together with a 7805 voltage regulator should give you enough output voltage to drive the mosfet. These chips cost less than a single replacement mosfet and you can drive 6 coils with them.

• ⁨Comment⁩ on ⁨Star Trek on LaserDisc, if you've got the right equipment, it looks amazing! (samples in the description)⁩ ⁨⁨9⁩ ⁨months⁩ ago⁩:

  IIRC from the “What we left behind” documentary, they were shot on film. They even had a few minutes of HD material scanned from the film reels. It’s the CGI that was baked only into the tape version that makes it so difficult to do a HD remaster. And why they went back to the tapes when producing the DVD release.

• ⁨Comment⁩ on ⁨How long could one survive with only water and beer and no food?⁩ ⁨⁨11⁩ ⁨months⁩ ago⁩:

  With 43 kcal/100ml you need about 4.6 liters or 5 qts to satisfy your caloric needs (2000kcal/day). If you even out the intake over the whole day, alcohol levels should be low enough to keep you functioning. Beer also contains a bit of protein and low levels of sodium, potassium and magnesium.

  Long term, you’ll get scurvy after a few months due to lack of vitamin C and liver cirrhosis from the sustained alcohol use.

• ⁨Comment⁩ on ⁨abandonware empires⁩ ⁨⁨1⁩ ⁨year⁩ ago⁩:

  It’s reverse: you get a board that has a floppy interface on one side and a USB socket on the other. You plug in a USB drive and the board uses a file on the drive as the floppy disk. It’s a little less convenient because you have to deal with disk images but it works without moving parts.

• ⁨Comment⁩ on ⁨Adjusting SMPS output voltage⁩ ⁨⁨1⁩ ⁨year⁩ ago⁩:

  It’s probably not a good idea for actual use, but if you’d like to experiment: looks like the 3-pin devices U4 and U5 on the upper right provide feedback through the optocouplers next to the class Y cap north of the transformer. I bet those are LM431 voltage references (or similar). The passives around them provide filtering, but two of the resistors should form a resistor divider for the Ref pin (lower right pin if the single pin is on top). That divider sets the voltage.

• ⁨Comment⁩ on ⁨Will you be willing to pay for using Twitter?⁩ ⁨⁨1⁩ ⁨year⁩ ago⁩:

  Isn’t that the same for Reddit or Lemmy? The content creators and mods don’t see a penny either. Operationally, a social network probably requires a lot more compute power and somewhat more bandwidth compared to a site that serves mostly static content. But I don’t see why small donations shouldn’t cover that. The cost per user seems moderate, otherwise few people could afford to run an instance with 1000s of users without charging them.