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  1. ratstar

    Henri Abrahams astable multivibrator

    Oscillators are beautiful, and teach us alot about electricity.
  2. ratstar

    Henri Abrahams astable multivibrator

    are the transistors the wrong polarity in the second one?
  3. ratstar

    Henri Abrahams astable multivibrator

    They actually do, I drew it wrong. If you have the leds on the bottom, when your charging the right one forwards, it charges the left one backwards. It says discharging, but im pretty sure its charging it backwards with the battery/source/vcc or whatever. But im just being cheeky, I...
  4. ratstar

    Henri Abrahams astable multivibrator

    Oh I see!!! I didnt quite work that out, that when its charging the right cap, its discharging the left cap down the same transistor. I missed it... Hang on a second, theres alot of versions of this oscillator that are different... I think I shouldnt have put the LEDS at the top, they are...
  5. 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...
  6. ratstar

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

    Max wasnt bumbling at all to me, he won every fight he was in!!! Clever devil.
  7. ratstar

    voltage divider with load question and guess

    The computer I'm planning on making is a hybrid, with non continuous time, but continuous values. Continuous time is more elegant in my opinion, and I'd love to see that in action, and even make it myself, but I've got a strategy for an oscillated logic chip that is actually potentially...
  8. ratstar

    voltage divider with load question and guess

    heres the next attempt Heres 3 oscillators, an 8 cap, and 2 4 cap oscs, none of them work fully, but they all get one hit to happen.
  9. ratstar

    voltage divider with load question and guess

    Yes the LED doesnt last very long before it burns out. So if I have R1, R2 and RL. When computing the current I compute for IQ -> volts/(R1+R2)=current IL -> volts/(R1+RL)=current? But what about the voltage, does it stay the same as without the load? (Given both resistances (R2 and RL)...
  10. ratstar

    voltage divider with load question and guess

    Bertus, thanx for the advice. Ill get this osc done soon. If you overvolt an LED you can get oscillations also. =) I dont understand voltage dividers properly, when you introduce a load onto a voltage divider, it wastes current doesnt it - because what is the output line, when the output...
  11. ratstar

    voltage divider with load question and guess

    Thanks Nanren888 for the advice. I could probably fix it tomorrow by adding a transistor to it, but I'm not comfortable with my theory of resistors and capacitors yet, I want to explore it further still, because the circuit still doesnt respond how I think it will, my theory is too...
  12. ratstar

    voltage divider with load question and guess

    I have a funny feeling about different coloured LEDS being different too, even tho isnt it just a different colour plastic on the outside? But the green ones seem to act different than the orange ones and I dont know why. I hope you dont kill me for saying the truth. This strange little...
  13. ratstar

    voltage divider with load question and guess

    The sketch is correct thank you, thats not a bad idea, I do love prints.
  14. ratstar

    voltage divider with load question and guess

    I think its because the capacitor is discharging into the led turning it off. And putting a resistor in the way, is making it not happen as much.
  15. ratstar

    voltage divider with load question and guess

    That wasnt an insult!!! I take back that your scared, more like you just cant be bothered with things that have no point. It could be a voltage reduction, im finding that is very tricky, and happens without me noticing alot!
  16. ratstar

    voltage divider with load question and guess

    I thought you guys were professional, and ur scared off by a little resistor diagram. Its behaving like complete nonsense as well... confusing as hell.
  17. ratstar

    voltage divider with load question and guess

    Can I please ask for your help again - Im really screwed and dont know whats going on. Heres a little circuit im exploring. Im deciding where to put the wire with the 50 ohm resistor either side of the 1k resistor. On the right, im getting very little response from the cap. On the left...
  18. ratstar

    voltage divider with load question and guess

    But I change my mind again. Its 9v. (on the 1.8v one) With even resistance both sides, it doesnt change the voltage balance. Its just where im at, at the moment... im probably wrong tho...
  19. ratstar

    voltage divider with load question and guess

  20. ratstar

    voltage divider with load question and guess

    Oh no! are u saying that at between those resistors its 1.8 volts??? Thanks I think you just helped me then. :)
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