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  1. Arouse1973

    Need help with a MOSFET npn type device

    Why is a p-channel complicated?
  2. Arouse1973

    Need help with a MOSFET npn type device

    Post the picture not a pdf. Thanks
  3. Arouse1973

    Need help with a MOSFET npn type device

    I am not sure what you want to do. Can you show us a drawing or something. A npn does not have a gate but an n-channel MOSFET does. If you want to source current to a load you could use a P-channel MOSFET. But you will need a level shift circuit control them. What ars you driving and what...
  4. Arouse1973

    Help with momentary switch

    What about Amazon? https://www.amazon.co.uk/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=tacktile+switches
  5. Arouse1973

    Help with momentary switch

    RS components, Newark, CPC possibly
  6. Arouse1973

    Help with momentary switch

    All you do is cut the legs off and then remove the little legs with a bit of solder on the iron and touch the leg and whip it out. You will only improve your soldering skills with practice. We can help you do that. Where are you based? Adam
  7. Arouse1973

    Help with momentary switch

    Hello Why not change the switches? Is that an option? Thanks Adam
  8. Arouse1973

    Wireless Power transmission using Atmega .... pls help!!!

    Frequency stability. Thanks Adam
  9. Arouse1973

    PWM Controller

    Hello Riccardo. Just a question, why are you using two 555 timers for PWM? With the addition of a couple of diodes you can just use one. Thanks Adam
  10. Arouse1973

    Wireless Power transmission using Atmega .... pls help!!!

    The OP messaged me for help. I said I would look at a TX circuit and post it here. This circuit works and I have had it running for some time now. It will easily put 250 mA into a single Lipo battery using the correct battery management hardware of course. L3 is the TX coil you can buy them...
  11. Arouse1973

    Want guidance for choose best UART or USART RF module for Arduino

    You first need to tell us the ISM bands in your country. In know 2.4 GHz is a global band but I think you will struggle to get 2 Km with the currently available modules out there, I might be wrong though. Adam
  12. Arouse1973

    Power Dissipation Across A Transistor In Cutoff

    Correct!
  13. Arouse1973

    Power Dissipation Across A Transistor In Cutoff

    No it doesn't to me. Fully on would mean saturated in a BJT. Turn on I don't think has a place here. Adam
  14. Arouse1973

    Introduction

    Hi Clive, welcome to EP. Look forward to you helping out! Adam
  15. Arouse1973

    Wireless Power transmission using Atmega .... pls help!!!

    That's not really a circuit diagram. Post the circuit diagram you used to start with, maybe we can get that going to save you a lot of time, if not, I have worked on this sort of thing for a few years now and a simple LC astable multivibrator is all you really need, it doesn't need to be...
  16. Arouse1973

    Wireless Power transmission using Atmega .... pls help!!!

    Yeah and some specs of what you are powering, The current and voltage requirement of the load and the distance the coils will be away from each other, the size of the coils space envelope. Also what do you plan to power all this with? Thanks Adam
  17. Arouse1973

    Power Dissipation Across A Transistor In Cutoff

    When the base collector junction is forward biased. Thanks Adam
  18. Arouse1973

    MC34071

    Amazon have some. If you need some. https://www.amazon.co.uk/10PCS-MC34071PG-SUPPLY-4-5MHZ-MC34071-x/dp/B019R4SL82 Looks like the part is obsolete also Adam
  19. Arouse1973

    Can anybody explain about how bjt works??

    You can use Ebers moll to work out the collector current vs Vbe, IC=Is*e^(Vbe/Vt). Although Is and Vt are not normally on the data sheet; the infomation can be found. In most cases a close approximation could be made on these values and I don't see this any worse than the random values that...
  20. Arouse1973

    Can anybody explain about how bjt works??

    What about a current mirror. Doesn't this use a voltage to program a current? Thanks Adam
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