Search results

Search Forums New Posts
  1. Arouse1973

    Finding rate of change of capacitor discharge?

    You have to remember that because it is discharging you are loosing 63.2% of the charge on the capacitor and your left with 36.8%. Thanks Adam
  2. Arouse1973

    Voltage control

    Hi Clark, welcome to EP. You can use an op-amp for this. A similar thread earlier this week maybe of help to you. Let us know if you need anymore help. Thanks Adam See here: https://www.electronicspoint.com/threads/pwm-to-0-10v.274101/
  3. Arouse1973

    Finding rate of change of capacitor discharge?

    Welcome to EP Travis. Well I am sorry to say..........your absolutely right :) Because the time your interested in equals Tau (R*C) then this is just 1-e^(-1) = 0.632 this is because RC/RC = 1. See (-t) is the time your interested in, as in after a certain amount of time the voltage will...
  4. Arouse1973

    (Ask) The proper way to repair laptop motherboard

    Get some books, the Art Of Electronics is a good place to start. Adam
  5. Arouse1973

    Hi, Everyone. I'm completely new to electronics. :^)

    Maybe I should read that one lol. Adam
  6. Arouse1973

    (Ask) The proper way to repair laptop motherboard

    Books are also good.
  7. Arouse1973

    (Ask) The proper way to repair laptop motherboard

    What do you understand about electronics?
  8. Arouse1973

    (Ask) The proper way to repair laptop motherboard

    Hello. First you need to learn electronics. How components work properly including some common circuit configurations. Also component identification is good to have.Then learn how to read circuit diagrams. Then learn how to use test equipment. Then learn how to use a soldering iron and...
  9. Arouse1973

    Combining red leds with very low powered 850nm - 880nm leds with eye safety in mind?

    The guide is in the links above. Be careful you don't burn yourself on the incandescent light bulbs. :)
  10. Arouse1973

    Newbie Needs Help In a Dark Sensor

    And also it won't be a quick switch over from off to on as it gets dark. You may find the buzzer starts to sound at low volume as the transistor starts to conduct and get louder and louder until the transistor is fully on. A comparator circuit with hysteresis will normally sort this out. Thanks Adam
  11. Arouse1973

    Hi, Everyone. I'm completely new to electronics. :^)

    You certainly will fit in with a sense of humour like that, welcome aboard Jesse. The website looks good, can't comment on the prices, I live in rip off Britain :) where everything is expensive even the cheap shite. I buy most of my stuff from Amazon traders where they do some good component...
  12. Arouse1973

    Combining red leds with very low powered 850nm - 880nm leds with eye safety in mind?

    The reason why it might get deleted is you never explain the motive behind the questions. For all we know you could be planning on making something at home and using it. Unless you follow the eye safety standard which I mentioned to you before you can not guarantee it will be safe. You asked for...
  13. Arouse1973

    Homemade Capacitor

    The only other thing that will work is Graphine coated insulators, good luck with that. I work with a student that made one as a uni project. Dont know what capacitance it was. Cant you just purchase one? Adam
  14. Arouse1973

    Homemade Capacitor

    Mylar may work Thanks Adam
  15. Arouse1973

    Transient Noise causing MAX7221 7-segment Display to Blank Out

    Hello You must always supply a circuit diagram and PCB layout if you stand any chance of us answering your question. Thanks Adam
  16. Arouse1973

    Combining red leds with very low powered 850nm - 880nm leds with eye safety in mind?

    You seem to have a more that general interest in human safety. I am concerned that someone with less experience may give you the wrong advice. I have given you the standards for eye safety and that is all you need. Although your post are interesting, I am not sure if the administration will...
  17. Arouse1973

    How to work with Zener diodes?

    At low zener voltages, field emission have an effect and these Zeners are much more sensitive to changes in current versus VZ. 2.4 Volt Zeners operate in the soft knee area, where their dynamic impedance is much higher. They need a higher current to regulate correctly. Looking at the datasheet...
  18. Arouse1973

    PWM to 0-10v

    Oh Bob, just the ticket. Nice one! Adam
  19. Arouse1973

    Hello u

    Hello Rafal, and welcome to EP. Adam
  20. Arouse1973

    How to work with Zener diodes?

    Hello Your diode for requires 20 mA to produce 2.4 Volts, so with a voltage of 29 Volts this requires a resistor (29-2.4) / 20 mA = 1330 Ohms. The power dissipated in the resistor will be (20 mA^2) * 1330 = 0.532 W. At 12Volts this will be (12-2.4) / 20mA = 480 Ohms , and the wattage is (20...
Top