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  1. Arouse1973

    How a BJT Transistor works (base current version)

    This is my understanding. With no electric field (Voltage) the average motion (current) of electrons within the junctions cancel out to be zero. When an electric field is applied across the junction the additional motion of the electrons in between their collision times (mean path time) is...
  2. Arouse1973

    How a BJT Transistor works (base current version)

    Hello Claude What your critics have been waiting for is for you to go through step by step the workings of the BJT according to the physics of the PN junction. I have lost count how many times Ratch has asked you to explain how YOU think it works from a physics point of view. I explained why I...
  3. Arouse1973

    stranded wire max.current

    It can also depend on the acceptable voltage drop across a length of cable. This will also produce heating of the wire which would need to be factored in also. Adam
  4. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    Ok so I forgot my programmer tonight. Pissed off now!
  5. Arouse1973

    flux / soldering paste..

    Solder paste is what is being used in the first video. You will need to Google this yourself. There are lots of different types out there. I am not going to link to one for you sorry. Adam
  6. Arouse1973

    Anyone recommend me a book?

    Hi Colin Who is it doing the corrections to this document? Thanks Adam
  7. Arouse1973

    Anyone recommend me a book?

    Wow, how did this book ever get published? I haven't gone through all the mistakes picked up to validate them but an initial look seems that this book should have never been published. Funny though isn't it how a document picking up typos have their own :) "p. 32, last line: The quantity...
  8. Arouse1973

    flux / soldering paste..

    Solder normally has flux inside. It is used to clean the part being soldered and to prevent oxides forming. It will not join the two parts together. You need solder for this, flux alone is not a solder. Flux is very good at making solder joints or for tinning wires. I often dip my bare wires...
  9. Arouse1973

    230V AC to 5V DC via phone charger

    Yep I second that. Leave it in its case. It means you can also plug it into the mains safely. Adam
  10. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    Yep thats my next job. When I have time. Adam
  11. Arouse1973

    laser ablation of PCB resist

    Wow very good Steve. Adam
  12. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    Thank Bob. Adam
  13. Arouse1973

    LED Tachometer on atmega8

    I am sorry, due the lack of comments in the code It would take me far too long to work out. Thank Adam
  14. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    Hi Jeff The FET will work if we keep the diode. This is the best option I think. We can increase the capacitor size and run the circuit out of sleep and every so often (TBD) charge the capacitor. This then means no extra constant drain on the battery. Only short burst of energy to charge the...
  15. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    Doesn't look like the device has a brownout feature. Adam
  16. Arouse1973

    Hello everyone , hope alls well

    Again welcome to EP, hope you enjoy it. Adam
  17. Arouse1973

    Hello everyone , hope alls well

    Hello. Welcome to EP. Anything else you want to say? Adam
  18. Arouse1973

    LED Tachometer on atmega8

    Hello please give us more details. Did you write the software yourself? Do you have a circuit digram. Post your code and explain how it should work. Adam
  19. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    Sorry I didnt get time today to look at this. Been busy decorating. Now having a few Ciders again. Still got a lot to do so might try tommorow. Ads
  20. Arouse1973

    Calculating frequency

    It was an example! You need to enter your values you have. Adam
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