• 4 Posts
  • 21 Comments
Joined 1 year ago
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Cake day: June 12th, 2023

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  • If i found a genie, one of my 3 wishes would be that reddit was viewed like Wikipedia. It should be a non-profit. I’d gladly donate to keep the servers up. I do that for Lemmy now.

    If I want to know something, I’m either looking at Wikipedia for general information, or reddit for specific. The odds that someone else has asked the same question on reddit it weirdly high. Even Google acknowledged that there search results went to shit because of the blackouts. How did we let such a wealth of knowledge get caught up in profits.

    I love Wikipedia. Even if it has flaws, it’s by far one of the best things we’ve created a humanity.










  • I wish I had an answer to that. For me, it’s knowledge and recognition. Having an open mind to hear both sides of an argument and trying to focus on facts, not “what ifs”. Then paying attention to not just what’s being said, but how it’s being said. It’s pretty easy to see when someone is trying to get you emotional rather than logical,but you have to be looking for it.

    When I hear a politician say “they’re trying to take away…” or “they want you to…”. That’s them trying to make you fear the other side. I don’t give a shit if you’re left, right, capitalist, communist, or a dictator, if you’re goal is to make me fear what the other side will do with power then you’ve already lost me. Because I know, that really you’re afraid to lose power and so you make other people afraid too. Unfortunately, it works for way too many people.





  • Transformers raise or lower voltage of ac circuits. They also do the opposite to current, e.g. Raise voltage, lower current.

    The rectifier makes all the voltage positive (or negative, but all the same). So yes, AC -> DC

    The filter basically uses inductors and capacitors to act as storage. Using capacitor as an example, it’ll start charging when the wave starts to rise. once the wave goes down, the capacitor discharges which keeps the output more positive. You can see that in the image by full humps before and partial humps after. It’s still bumpy, but it never goes to zero.

    The regulator can do a couple of things, mostly it’s used to ensure a constant output. In it’s most basic, it’ll be another diode that if voltage goes above a certain threshold, it shunts it away from the load. So if the output of the filter had a minimum of 5 volts and the regulator was set to 5, you’ll end up with a constant positive 5 volts because the diode is shunting away all the extra voltage.

    Regulators can provide both over and under voltage protection in case there is fluctuations in the circuit.


  • Kind of. You’re on the right track.

    What you’re missing is that there is a loop. Imagine a resistor being connected to negative and positive of the load. Since it’s about relative voltages not absolutes, d1 and d3 both conduct. A positive on the triangle, or a negative on the bar will make them conduct. For electricity to flow you must have a loop from source to load and back to source. So current would flow from the source through d1 through the load through d3 and back to the source.

    Hope that makes more sense.

    You could remove d1/d4 OR d2/d3 and you’ll have a half wave rectifier, so you’ll get every other peak.



  • Think about the circuit over time. The sine wave on the left is the input.

    When the sine wave is positive, the top wire is positive and the bottom wire is negative. That means d1 and d3 are both positive and d2 and d4 are both negative.

    Diodes “forward bias”, meaning they allow electricity to flow, when you have a positive on the triangle side. This also implies a negative on the straight bar side. If the positive is on the straight bar side, then it won’t conduct. You have to have a negative on the straight bar side.

    Note: Keep in mind positive and negative means in relation to each value. So if one side is 5 volts, and the other is 0, then the other side is negative compared to the positive side.

    So with that in mind, when the sine wave is positive, greater than 1,then d1 and d4 are conducting (there an implied loop on the left side).

    When the sine wave is negative, then d2 and d3 are conducting. Because these two diodes are flipped, the high value goes to the top wire on the output which is now seen as a positive. The input is different, but because you’ve flipped the wires, the output is still the same. Now all current flows in one direction no matter the input. AC is now DC.

    Shorter verison: positive side of the sine wave makes d1 and d4 conduct. Negative side makes d2 and d3 conduct. Since d2 and d3 cross over, they effectively turn the negative into a positive value.




  • Exactly. It’s not that people prefer the hot over the cold. It’s thats they prefer the activities of one season over the other.

    I prefer gardening, swimming, and a whole host of other things over ice skating or skiing. I prefer backpacking without needing to wear snow shoes. An ice cold lemonade is wayyyy more refreshing than a cup of hot cocoa. At least to me. To each his own.

    Also, cold hurts, it makes exposed skin tingle and makes me less flexible. Heat is uncomfortable, you just have to manage your water and use of shade better.


  • The app looks great! Feels very fluid.

    I have only three requests:

    • make it FOSS in spirit of the fediverse (obviously you don’t have to, that’s your choice)
    • give me a way to download pics from inside the app. I very often download memes and share them in other chats. You’ve got open external, which works, but it’s an extra step. Downloading in app would just be more convenient.
    • lastly, give me a way to buy you a beer 😁