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  1. audioguru2

    Question on the Plants Watering Watcher circuit

    To All, I was going to build a bunch of these cheap circuits (with my improvements), but now I realise that LED brightening (dimming in reverse) is a lousy way to indicate soil dryness, as i explained earlier (and now I have an even better idea): I am certainly not going to use a complicated...
  2. audioguru2

    "Notify of Replies"

    Mixos, Yes, I see that all other forum replies that work OK for me do not use a semi-colon (;) in their notify URL. Maybe my e-mail client does not know your font, I see that the "dot" of the semi-colon looks to be very high. If you can't fix it then maybe it is time for me to upgrade my Win98...
  3. audioguru2

    "Cannot Connect", again and again

    Mixos, I got this error about 1 minute ago: Warning: file(): php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution in /home/electronics-lab.com/www/footer/linkman_0.php on line 30 Warning: file(http://www.electronics-lab.com/footer/linkman_0.php?mode=links): failed...
  4. audioguru2

    Why use RMS

    Kevin, Are you talking about a True-RMS meter that uses a special chip to do the mathematical function, or a simple meter that average or peak rectifies the signal, and assumes that it is a pure sine wave during its adjustment calibration? The simple meter does not remove the DC, its input...
  5. audioguru2

    Light Switch

    Siddharth, A photo transistor, and even a photo-darlington transistor, do not have enough output current to power an incandescent light bulb. The regulator in your circuit does not boost the current. That is good that your emitter-follower/regulator circuit works well. If you provide an input...
  6. audioguru2

    Digital Phase Shifter

    Kurt, For what is it that you need to shift the phase, audio? or video? Over what frequency range, telephone quality? or CD quality? For video, VHS quality? or DVD quality? What are you making? A quadrature modulator? Please provide as much information as you can, so that we can help you better.
  7. audioguru2

    "Notify of Replies"

    Mixos, The highlighted part of my notify e-mail is also underlined. The part that is not highlighted is also not underlined, maybe that is the problem. It is difficult to copy and paste because my browser is not opened. Outlook Express opens my browser when I click on a highlighted URL. If I...
  8. audioguru2

    basic capacitor question

    Yevgenip, The formula for charging a capacitor through a resistor from a fixed voltage source is: R X C. Where R is in Ohms and C is in Farads. The result of the multiplication is in seconds, when the capacitor will have reached a voltage that is about 0. 63 of the fixed voltage. To calculate...
  9. audioguru2

    "Notify of Replies"

    Mixos, I see the problem: In my e-mail, this part of the address is NOT highlighted: action=display;threadid=804;start=new Since this part directs my Outlook Express to the topic, it does not see it when I click on it, and sends me to the index instead.
  10. audioguru2

    "Notify of Replies"

    Well, it has been over an hour and I did not get a notify e-mail about my own reply because that is fixed now. The previous notify e-mail sent me to the index page "General Feedback/Comments", instead of to this topic, like other web-site forums do. The e-mail was this: A reply has been posted...
  11. audioguru2

    "Notify of Replies"

    This is a test of "Notify of Replies". On my next post I will copy-and-paste the e-mail link and explain where it took me.
  12. audioguru2

    "Notify of Replies"

    Mixos, Thank you, I have not seen a notify e-mail of my own reply all day today (previously every post that I made). I still hope that you are able to have the notify e-mail link to a thread instead of linking to the index.
  13. audioguru2

    Question on the Plants Watering Watcher circuit

    MP, I didn't say that the author WILL update the circuit with my improvements, I said that he MAY do so, which is what he says. What is your concern about a filter in a Schmitt-trigger (with hysteresis) circuit? It makes a perfect time-delay, since the output responds exactly when the rising...
  14. audioguru2

    Question on the Plants Watering Watcher circuit

    MP, Sorry, no disrespect, but please make accurate statements. You don't believe that I corresponded with the author of this project? How's this: Hello, thank you for your suggestion. I will try the added capacitor and reconsider the whole circuit (which has been designed and prototyped...
  15. audioguru2

    Question on the Plants Watering Watcher circuit

    MP, Where is the high-pass filter? Since when can a high-pass filter create a voltage pulse delay? I have been telling you all along that the circuit needs a delay, so that it can perform PWM on the NAND gate, causing the LED to dim. Maybe you don't understand the difference between a high-pass...
  16. audioguru2

    Digital Counter

    Dl, Do you want to build a random number generator?
  17. audioguru2

    Light Switch

    Ante, I think that he is using this one. Siddharth, Am I correct?
  18. audioguru2

    Help needed selecting a chip for my project

    Ante, Sorry, but The Rolling Stones were on my radio. ;D No disrespect.
  19. audioguru2

    Help needed selecting a chip for my project

    Ante, Sure, that's real cool, man (or bloak, or mate!).
  20. audioguru2

    Question on the Plants Watering Watcher circuit

    Here is my slightly modified schematic of this project:
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