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  1. MP1

    Weird relay problem..

    Kasamiko, in answer to your previous question, I find that when using transistors as switches by saturation, it is much better to use them in a sink mode rather than as source mode. Because of this, I use a PNP type of transistor. It has less effect on your supply voltage and all you need is to...
  2. MP1

    Weird relay problem..

    Kasamiko, what is the voltage at the base of the transistor when the relay is to be turned on? Is the relay a 12 volt relay? Not sure what will help until I know these things. MP
  3. MP1

    Weird relay problem..

    what is the voltage at the base of Q1 when the transistor is turned on and what is the resistance of the relay coil? This is a strange way to connect a relay. MP
  4. MP1

    Electronic Stethoscope

    someone builds it, fixes the part that does not work, posts the fix. This has been done with other projects such as the voltmeter project. MP
  5. MP1

    Data Sheet K818, K819 and BD705, BD708

    Thanks! MP
  6. MP1

    Electronic Stethoscope

    audioguru, there are different ways to look at this. From a manufacturer's point of view, yes, you would not build a product with questionable parts availability. However, a hobbyist would have no problem with it for a one up circuit. As CDAK has pointed out, in his application, he had...
  7. MP1

    touch switch

    There are probably as many touch switches out there as there are fuzz box circuits for guitar. If you don't like one design, there are hundreds more to look at. You can find several here, for example: http://www.discovercircuits.com/C/capacitance-sw.htm MP
  8. MP1

    Electronic Stethoscope

    LM387 is still available through digikey. I have not tried other sources, but I am willing to bet that they are also available through other vendors. Also, many parts which go obsolete in the US and Canada are still widely available in other countries. Obsolescence of a part is many times...
  9. MP1

    Electronic Stethoscope

    It is still available from Digikey. MP
  10. MP1

    Generators

    audioguru, Whether DC or AC, the capacitor will not store current. Current is a term used for the movement of electrons. MP
  11. MP1

    Selectable source?

    A simple audio mixer with a rotary switch comes to mind. You will lose the audio of the channels not selected, though. Second choice: If you want to store the audio of the unselected channels, you will need some type of recording circuit. Perhaps one of the digital recorder chips. Is this going...
  12. MP1

    Generators

    No. Current is not stored. It is not stored in a battery, either. Current is a measurement of the movement of electrons to put it overly simple. The electrons have to be moving to have a current measurement. Capacitors themselves offer opposition to current flow. This opposition arises from...
  13. MP1

    Selectable source?

    What kind of a signal? MP
  14. MP1

    Generators

    audioguru, what are you talking about? You cannot store current. MP
  15. MP1

    touch switch

    Here is the schematic for this kit. MP
  16. MP1

    Analog/Digital GND

    Point taken. Not a good example but made the explanation easier. The difference is this: In analog, you could add a little filtering to the board to get rid of any digital glitching since it is all built around a specific clock frequency of the on-board electronics. Many do not know this. You...
  17. MP1

    "Cannot Connect", again and again

    Fatal error: Cannot redeclare phpadmentor_maxinttonull() (previously declared in /home/electronics-lab.com/www/advertising/phpadmentor_config.php:18) in /home/electronics-lab.com/www/advertising/phpadmentor_config.php on line 18 Sunday AM. MP
  18. MP1

    How do I make a dc circuit auto-off after 60 minutes

    try a CD4060 in your search. MP
  19. MP1

    Gerber PCB design

    It has been my experience that most ALL of them will produce a gerber. There are not good gerber and bad gerber files. It either is or it is not. So, the differences in the software packages ar chosen by what you like best in the application. User interface, selection of parts, ability to create...
  20. MP1

    "Cannot Connect", again and again

    Hey, that looks like my error... ;D MP
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