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  1. ratstar

    do passive rc filters have problems with 10GHz + frequencies?

    I was looking around on the net, and I stumbled apon a video which showed the rise time of a square wave oscillator causes ringing if its short enough, and is a problem in old logic boards/IC's. Is this the same for capacitors? I mean is there some problem capacitors have with high frequency...
  2. ratstar

    low current plasma arc question

    when electricity arcs (as in it leaves the metal and goes back to it) How much power dissipation does this cause?
  3. ratstar

    very high oscillation down copper wire

    Sorry if this question doesnt suit the forum, but I dont know where I can go to ask this question, but I know you guys know things about this, you just dont like telling people for some reason. So can copper wire support high oscillations like above 100 gigahertz. What problems does such high...
  4. ratstar

    is an optocoupler faster rise time than a transistor?

    When you want to make a gigahert oscillator, I see on the internet that transistors only rise in megahertz not gigahertz. (But that could be bulldust... oc) But I was wondering what the switching speed of optocouplers would be? It could be faster. So its an led, next to a photovoltaic cell...
  5. ratstar

    What the hell is a 8.5GHz Quantum Analyzer?

    Link-> https://www.zhinst.com/others/en/products/shfqa-quantum-analyzer
  6. ratstar

    Gpu and high power requirements.

    [edit question changed] so if a single cpu takes what it takes to light 1 led. a gpu would take what it takes to light 2000 leds, if it had 2000 cores. How much power does it take to run 1 led? So its a bit of a silly question, because I bet a computer (even an analogue one) maybe could run...
  7. ratstar

    passive inverter circuit with one short pulse

    I know you guys prefer doing inverters with transistors, but this one is actually pretty good, I can actually invert half the resistance with double the resistance so it could be useful, And its actually because there is a capacitor, the charge only partially turns off, but it gives the...
  8. ratstar

    Henri Abrahams astable multivibrator

    I thought I got the two phases right until I noticed the caps are the wrong way around! Have I got this wrong? (im pretty sure I do... I need some help, but ill work it out later, im getting tired.) The two circle arrows are the discharge paths for the capacitors, and the rest of the red is...
  9. ratstar

    voltage divider with load question and guess

    My guess is its still 4.5 volts from some confounding experiments ive been doing at my battlestation. (desk). If I can finally understand this itll be a good start, since its been 4 years or so and still counting, I know im fairly behind but I keep truckin on...
  10. ratstar

    can I have some help with measuring hz of an osc with a multimeter

    I have a Q1088, and im only getting a hz response (that goes higher when i put the voltage up. at a couple of khz) when im splitting the circuit, it gives me no response when i dont split the circuit into the multimeter. The manual says just "touch": the circuit. So am I doing this right, or...
  11. ratstar

    electronics point experience anti-climax

    we arent allowed to share anything... so we are all lone wolves, we dont help each other. And its not just here, its every damn forum on the internet! Not one ever lets you share your designs, and its not that im selfish, I wished I could look at other peoples as well. Its like the...
  12. ratstar

    short circuit detector

    got another one for u dudes to gawk at the insane simplicity. =) I replaced the picture for a better one, more descriptive and in voltage divider mode instead of current divider to save overloading the led.
  13. ratstar

    transistor base load

    I know I said I wasn't going to say anything, but this is a technical question, I was just wondering if you can use a 100k load on a transistors base, and it could still fire. Im asking because I want to make a 1 wire 100kOhm delay line (1 full second delay) and i was wonder if the transistor...
  14. ratstar

    Just a thread of thanx

    Thanx everybody, for making things a challenge. Theres no point blabbering on about your little tricks, when everybody has tricks, and if your trick is a good one, why spread it out like a rabbit virus, when it was more special, when you kept it a secret. Machines can become a sick obsession...
  15. ratstar

    Does this video impress u guys or is it a FAIL

    Here it is, a guy put together an electrical machine - what do u guys think??
  16. ratstar

    analogue memory system

    Hopefully this picture is neat enough to be understood. You catch the value in an exiting capacitor each time, and u get to keep reusing the "signal level". The idea is, you set the capacitor to a setting, and then it ping pongs with an ac signal, and it can keep repeating the same amount...
  17. ratstar

    Battery question

    Say you have 2 batteries. Can u conduct from the + of one battery to the - of the other? If you cant, and they have to be from the same battery, why not?
  18. ratstar

    I cant measure voltage on 100 picofarad capacitors on multimeter

    Is this because the power is draining out of the capacitor before the multimeter can read it?
  19. ratstar

    AC->DC converter without a diode.

    If you put ac into a capacitor, and the discharge of the capacitor is the output. Then the ac will charge it from neutral to positive, then youll get a back charge from the ac, and this will make it go back to neutral again. (so then you dont get a negative half cycle!) The problem is, if...
  20. ratstar

    I made a 4cmx4cm 33 microfarad capacitor!

    Thats right 33 microfarads, and I got it to pulse an led for proof! I made it with copper tape, putting down some glue stick, then put a lining of glycerine down. It would be better without the glue, but the glycerine beads against the metal so it doesnt make a good enough separation. Getting...
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