Search results

Search Forums New Posts
  1. KrisBlueNZ

    Mosfet bridge safety

    What about the other characteristics of the body diode, Bob? (Or anyone?) Are they fast enough? Is it just their current (and voltage, obviously) ratings that are important?
  2. KrisBlueNZ

    What does the symbol imply?

    I guess so. I haven't read the data sheet enough to know what signal is controlling all of the switches, but I assume that the triangle shows the position of the switch in a specific case - either the low phase of the control signal, or the high phase. So during one phase of the control signal...
  3. KrisBlueNZ

    Motion sensor

    What's the reason for the motion sensor? And if your dog is distracted by the radio, couldn't you just leave the radio ON while you're out? Or couldn't you take her to a friend's place or get a friend to baby-sit her? That would be a lot more effective wouldn't it?
  4. KrisBlueNZ

    What does the symbol imply?

    Have a look at the diagram on page 5. It looks like that symbol represents an electronically controlled changeover switch that connects its left side to one or other of the two rails named on the right.
  5. KrisBlueNZ

    What does the symbol imply?

    It might represent an electronically controlled switch, perhaps. Can you give the full URL of the article the circuit come from?
  6. KrisBlueNZ

    Capacitive Reactance Circuit

    You shouldn't use an ESR of 5.6 kΩ for C1. C1's capacitive reactance of 5.6 kΩ at 60 Hz is due to its capacitance, 0.47 µF. LTSpice calculates and simulates the capacitive reactance based on the capacitance and the frequency. You don't need to calculate it yourself and enter it as an ESR figure...
  7. KrisBlueNZ

    What does the symbol imply?

    A circle with an X inside it usually represents an incandescent light bulb. But without more context, i.e. the rest of the circuit, I couldn't be sure that that's what it's supposed to represent in that circuit.
  8. KrisBlueNZ

    Hello!

    Hi and welcome to Electronics Point :-)
  9. KrisBlueNZ

    too much input voltage?

    A compressor acts on the amplitude of an AC signal (usually an audio frequency signal). I think in this case, the input signal is just a voltage level, not an AC signal with varying amplitude, and its range may exceed the 0~5V range of the buffer amplifier. The best answer to the question...
  10. KrisBlueNZ

    Renewable Energy

    Right.
  11. KrisBlueNZ

    74HC393: 4-Bit Counter in need of debounce?

    Agreed! An oscilloscope is like opening a window on the hidden world of component and circuit behaviour. Crystal oscillators are good. There's also a very simple oscillator based on a Schmitt trigger - they are versatile circuit components! Just a single Schmitt trigger inverter, plus an R and...
  12. KrisBlueNZ

    Use diode to attach multiple circuits

    Hi there Albert :-) Welcome to Electronics Point. How about you tell us more about your project. It's very difficult to answer an abstract question. Much better to describe the whole project - what are you trying to achieve? What parts have you already decided on? Start from the beginning and...
  13. KrisBlueNZ

    74HC393: 4-Bit Counter in need of debounce?

    Sure :-) The 555's output will swing pretty quickly, so you won't need a Schmitt trigger. It doesn't swing all the way from 0V to 5V though; run the 555 at a low frequency and use your multimeter to see how far it swings. When it swings high, it'll probably swing somewhere between 3V and 4V...
  14. KrisBlueNZ

    PC Speakers malfunction. Need help

    Cool! You're welcome :-)
  15. KrisBlueNZ

    Red seven segment led display

    Hi there and welcome to Electronics Point :) Yes, myself can direct yourself to two good sources of electronic components: Digi-Key (http://www.digikey.com) and Mouser (http://www.mouser.com). They have the largest range of components. They are both based in the U.S. and their overseas shipping...
  16. KrisBlueNZ

    Rain Sensor Status

    That's right. But from the point of view of a fully isolated circuit, there is just 115V AC RMS BETWEEN Phase and Neutral. Which one is the reference point is irrelevant. The circuit COULD be made (or connected) so that its 0V rail was connected to Phase, then from its point of view, it would be...
  17. KrisBlueNZ

    Rain Sensor Status

    Yes, 1N914 and 1N4148 are kind of interchangeable. I think the 4148 is normally rated for 200 mA and the 914 for only 100 mA but I think it depends on the manufacturer anyway. Not sure. Right, well I think it comes down to what you consider the reference point for voltages. It's true that in...
  18. KrisBlueNZ

    Need help building a basic digital counting circuit.

    Yep.
  19. KrisBlueNZ

    Capacitive Reactance Circuit

    Yes it might. Did you fix my error in the value of R1? What value did you use for the ESR of C1?
  20. KrisBlueNZ

    Capacitive Reactance Circuit

    I know why! It's because I messed up when I copied chopnhack's schematic. For some reason I made R1 100Ω instead of 470Ω. With the correct value, LTSpice gives the mean power dissipation as 207.54mW. Sorry! The voltage and power waveforms are still noticeably different from chopnhack's second...
Top