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  1. Arouse1973

    2S LiPo charger / 12V power supply - possible?

    Yep that will work. Well done. Although you are wasting energy with the extra diode but I guess everyones happy now. Good work. Adam
  2. Arouse1973

    Digital voltmeter - 500m cable

    Hi Mikey, welcome to EP BTW. Ok so what is your question? Have you tried something that doesn't work or you want some ideas? Also what are you using to measure the voltage? And what is the gauge of your wires? Adam
  3. Arouse1973

    Has utility power been restored?

    I assume you want the buzzer to sound when power is lost. Otherwise won't it be sounding all the time when you have utility power? Adam
  4. Arouse1973

    Has utility power been restored?

    Yep, Green LEDs can be used.
  5. Arouse1973

    push button circuit for quiz

    Hello You need to supply a block diagram and we help you with the circuit, that's how it works! When you say the project can be used for a quiz game, what else can it be used for? Is this homework? Do you have to use 555 timers? Thanks Adam
  6. Arouse1973

    2S LiPo charger / 12V power supply - possible?

    No because the diode will be reverse biased due to the fact the PSU voltage will be higher than the battery voltage. The battery charger will effectively have nothing connected to it so it will be fine. I did get a response from Microchip about doing this and they said umm well not sure but it...
  7. Arouse1973

    2S LiPo charger / 12V power supply - possible?

    Spot on! Adam
  8. Arouse1973

    2S LiPo charger / 12V power supply - possible?

    I had the same problem with this device I designed in to a product. DO NOT DO THIS, you risk blowing up the batteries. You can not use a P-channel MOSFET, it will conduct the opposite way and start charging the battery from the supply. This is very dangerous!! The device goes into shutdown mode...
  9. Arouse1973

    Good book for Electronics

    LOL, that's funny!
  10. Arouse1973

    Hello

    Hello and welcome to EP. Hope you enjoy it here. You wont find us as stuck up as the other forums. Adam
  11. Arouse1973

    Good book for Electronics

    I knew it would be you that responded :). My mate Richard Feynman would have helped, but he is sadly no longer with us. Adam
  12. Arouse1973

    Good book for Electronics

    Glad the operation went well Steve (your new avatar) they lost the beard, but could have given you more hair :) you look a lot younger by the way :) Adam
  13. Arouse1973

    Good book for Electronics

    Why don't you just tell us what you are struggling with. I always find speaking to people on here a great way to learn. They pick up on where you have difficulties by what you write, they can then adjust the level of technicality to suit. I am predominantly self taught and I wish I had a place...
  14. Arouse1973

    Unusual 12V SLA Charger Circuit

    Ok so I have had another look at the circuit and I still think C1 has a smoothing effect. The top capacitor will be take energy from the battery and or the supply. Then as the voltage at the join point of the two capacitors rises this pushes the energy that's in the top capacitor out into the...
  15. Arouse1973

    Voltage Issue with Dual L298 ICs wired to Raspberry Pi

    Sorry Steve, I didn't mean to upset you. I personally find Veroboard better for me. Perhaps other beginners can give their opinion on this rather than an old grouch like me :) Adam
  16. Arouse1973

    Voltage Issue with Dual L298 ICs wired to Raspberry Pi

    Oh dear, Sorry Steve but I think you may need to start again. I can't follow that very well at all. What I would do is use linking wire or use Veroboard which have the tracks running across the board and then you link and cut where you need to. See here...
  17. Arouse1973

    Total beginner... so I don't know if what I want to do is easy or hard!

    This is very interesting. One other thing I would like to add is, the run away condition will only occur as the field decays towards zero. When the field is zero you will have zero torque but this can take many seconds and the motor could have reached destructive speeds within that time. And as...
  18. Arouse1973

    LP2950 Indecision - How would you do it?

    Cool let us know how you get on. Cheers Adam
  19. Arouse1973

    LP2950 Indecision - How would you do it?

    I would choose "B" personally. As @AnalogKid said It has better ripple rejection and transient response than "A". Also something to consider is a diode across the device, some devices can be damaged if the output is shorted or just when powering down. However you only have a 10uF on the output...
  20. Arouse1973

    Voltage Issue with Dual L298 ICs wired to Raspberry Pi

    Hi Steve. A few things to start with. If the battery can supply enough energy for two motors and when you disconnect them and try your new circuit with one motor it fails then either: 1) The motor is too powerful for the driver (You didn't say it was the same motor as the others). 2) The motor...
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