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  1. MP1

    Component identity

    How do you know it is a regulator and not a transistor? Any chance of you attaching a picture of it to your next post? MP
  2. MP1

    speaker to line level

    Headunit is a brand? I still would not use a passive circuit for this. Even if it is a wimpy 14W unit. BTW--I get all kinds of pages on a search for the word headunit. I also get many different brands with different wattage. Are you sure about the 14 watt spec? Where did this spec come from? I...
  3. MP1

    speaker to line level

    That would pretty much depend upon the watt rating going to the speakers. I have not seen many (inexpensive) pots that are rated high enough to keep from generating heat if you do this with a good sized amp. Some will start smoking. Then you have changed the impedance of the output.....but if...
  4. MP1

    speaker to line level

    It is better to tap into the amplifier at the preamp output rather than the highly amplified speaker output. You will be damping unnecessarily. The preamp section of your amp will give you the line level you are looking for. MP
  5. MP1

    220V extension cords...

    This would all depend upon how much current your 220V device needs. MP
  6. MP1

    100W Audio Amplfier By Smart Kit

    What more is there to say? If you are going to substitute parts, you need to compare the specs. MP
  7. MP1

    Question about Ground Loops

    The answer to question #1 depends upon the schematic of the individual device. Some devices ground the chassis and some do not. The answer to question #2: Set your multimeter to ohms and check the resistance between the ground of the two connected devices. For example, the resistance between...
  8. MP1

    Led display Digital Voltmeter question

    Bits, you only need to limit the input. Obviously, you do not want to apply this much voltage to the input. This can be done in many ways. One way is to use a 10:1 transformer, discrete parts, and a little calculation. Is this what you mean by "current transformer"? Once you have the correct...
  9. MP1

    Google before posting

    Scott, in agreement with ante, I assure you all moderators do not agree with the "search google first" syndrome. Many google searches will even bring you here. This site has lots of information and a pretty good search engine in itself. Combine that with the articles and projects sections, I do...
  10. MP1

    MOVED: power supply controlled by microcontroller 90S4433

    This topic has been moved to Microcontroller Projects, Programming. http://www.electronics-lab.com/forum/index.php?topic=5077.0
  11. MP1

    [README] Please read this before posting in Projects Q/A

    kno, You will get the best help with a microcontroller project in the microcontroller area. MP
  12. MP1

    LM317 works Bad "SOS"

    indulis, you make a very good customer. Some testing is always done. All tests are rarely done. audioguru: preconditioning is not the same thing. It is interesting that the guy who talks the most here on the forum about chips that do not meet specs is the same guy to say all regulators are 100%...
  13. MP1

    LM317 works Bad "SOS"

    ...actually, the factory does NOT test every chip. A select percentage of chips are tested for QA assurance. This is why there is a parts warranty. No one tests every chip they manufacture. Once a set of specifications are setup and initial testing of a batch have provided statistics, a program...
  14. MP1

    Low-pass Filter?

  15. MP1

    Cleaning potentiometers

    Yes, that is what I meant. Thanks for clarifying. MP
  16. MP1

    Tssop package -> DIP

    You must have pins to plug into the breadboard. Another route is to make an adapter yourself. Just use a board layout program like Eagle and terminate all of the pins to in-line pins which will allow you to plug into your breadboard. This is how I made a PLCC to 40 pin DIP adapter for my...
  17. MP1

    LM317 works Bad "SOS"

    Yes, gogo: The use of diodes will give you protection. You will be able to short circuit the output of this power supply without causing the project to go up in smoke. Sure, the regulator has some internal protection, but why stress it? No one anticipates shorting their supply, but there are...
  18. MP1

    Tssop package -> DIP

    They are not cheap, but you can get them: http://www.soundlabsgroup.com.au/browndog/browndog_narrow_wide_so28_tssop_pindip.htm http://www.accutekmicro.com/product_detail.cfm?Product=DIP%20Adapters http://www.logicalsys.com/ MP
  19. MP1

    Cleaning potentiometers

    Interesting. I am guesing that the 0 becomes some value of resistance as you rotate the knob? In answer to your question of resistors: I use 1% tolerance resistors on my bench. This keeps a pretty tight margin. For some items, like temperature sensors, etc., I use 0.01% tolerance resistors. You...
  20. MP1

    Switching circuit

    You did not say how they are electronically turned off, so the first thing that comes to mind are circuit breakers like what are in your mains service box. There are smaller versions of these also. If you do not mean a breaker, then you might put something together with CD4066 cmos switches for...
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