Search results

  1. EdwardM

    Transistor Tester

    ....and another thing The 50K resistor is most cheaply produced by connecting two 100K resistors in parallel  ;D Ed
  2. EdwardM

    Oscilloscope decision

    Hi cynicmonster, First off, interesting handle. ;D Makes me assume you've not had one before - You have to ask, what do I need it for? If your interests are in (relatively) low frequency analogue/audio then almost anything modern will do.  If you do a lot of digital work, even at low...
  3. EdwardM

    credit to electronics lab

    Goes for me too! Ed
  4. EdwardM

    How does computer signals are getting captured by the others?

    Especially Ante  ;D Have a good one Ed
  5. EdwardM

    How does computer signals are getting captured by the others?

    Just because you're paranoid, doesn't mean the whole world ISN'T out to get you Ed
  6. EdwardM

    Sound to Light controllers

    Hi Ante the music was brilliant, why improve on perfection?  ;D Great New Year to you too Ed
  7. EdwardM

    Sound to Light controllers

    Hi All a few days ago one of our contributors came up with this web site http://www.ebaumsworld.com/videos/xmaslights.html and my wife and I were blown away by the sound/light.  I'm thinking of doing something similar/different during this year - does anyone have experience of this sort of...
  8. EdwardM

    My first project

    Hi Audioguru sorry, I just had to say it... You're the LEaDing LIGHT Happy New Year Ed
  9. EdwardM

    How does computer signals are getting captured by the others?

    Hi Bedri try a google search for TEMPEST. All electronic equipment radiates energy in some way and with a sufficiently sensitive receiver these signals can be picked up. For example, a computer monitor receives signals across a screened cable - the screening is not perfect and you can get...
  10. EdwardM

    need help designing a power supply 3.6V 10A

    Hi Logitec I don't know of a linear regulator chip (like the 7805) which will do as you require with an input which is only 0.4V above the required regulated voltage and that's why I gave the answer that I did, I know that manufacturers are continually improving their products and what you need...
  11. EdwardM

    need help designing a power supply 3.6V 10A

    Hi Logitec 3.6V @ 10A IS 36W.  If your converter is, say, 80% efficient, this means that the input power is 10/8*36 = 45W. Therefore the input current at 4V would be 11.25A,  if this amount of current is available then you will need to design a DC-DC converter to do the task.  This means...
  12. EdwardM

    Need help solving problem on daughter's schience project.

    Absolutely  ;D Happy New Year Ed
  13. EdwardM

    Help needed with metronome using 555

    Hi Ben the fact that your circuit works happily with batteries means that there is nothing wrong with it.  I suspect that the transformer/adaptor connected to the AC line is not capable of supplying the current needed to drive the speaker at a sensible volume. A couple of things to try... Use...
  14. EdwardM

    Need help solving problem on daughter's schience project.

    Hi an even simpler way of doing it... It requires the student to start a stop-watch at the beginning of the test and at every 5 minutes to record current and voltage in her notebook - no hi tech required ;D Best of Luck Ed
  15. EdwardM

    Need help solving problem on daughter's schience project.

    Hi Wesley seems to me that one solution is to buy or build a simple data logger, I've used PICOscope in the past which is essentially an analogue to digital converter(ADC) and will in conjuction with some PC software produce a graph of some quantity(current, voltage, pressure etc) against time...
  16. EdwardM

    faulty analogue multimeter

    Hi if your multimeter has typically a 100uA meter movement for full scale, this means that at each of the ranges you mention, 10V, 2.5V and 0.5V there will be a resistance in series with the meter of 100KOhms, 25KOhms and 5KOhms - representing a varying load on the AA battery that you are...
  17. EdwardM

    I see the pic compiler flow chart basis

    Whoa, I'm not given to sarcasm - honest! ??? What I meant was that no matter how much you pay for a system which produces code for you, unless you understand and can verify its operation you can never be sure that it truly 'works'. Also, I was being honest about aircraft software, that's what...
  18. EdwardM

    I see the pic compiler flow chart basis

    Hi At $690US, I'd expect it to control every available PIC.  As a lazy programmer, I'd like to find find a system which would allow me to control the world with a minimal number of keystrokes, however, I've haven't found one - so I'll have to go back to work next week and carry on preventing...
  19. EdwardM

    My first project

    Hi All relative to 7805's and such like - by the time a fresh 9v battery drops below the voltage necessary to sustain a 5v output, you will be long since bored by a single LED flashing around a loop and probably moved on to several (hundred?) in sequence. Belated Merry Christmas Ed
  20. EdwardM

    Grey Code used in radar (weight bit)

    Hi Joseph "Gray codes are named after the Frank Gray  who  patented  their     use for shaft encoders in 1953"     "A Gray code represents  each  number  in  the  sequence  of  integers     {0...2^N-1} as a binary string of length N  in  an  order  such  that     adjacent integers have...
Top