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  1. Arouse1973

    Cup with heat awareness

    Hello. Do you have any information and pictures of the devices you intend to use. If you do then please post them here. Thanks Adam
  2. Arouse1973

    Sound activated switch advice

    No probs, good luck. Adam
  3. Arouse1973

    Sound activated switch advice

    You have your LED in the wrong place. Connect your LED to the drain, and connect the source to your common 0 Volts and try that. Adam
  4. Arouse1973

    Is there anyone familiar with the Pioneer DEH-55SDK car stereo?

    Please take a good picture of the back of the stereo showing the wires. Thanks Adam
  5. Arouse1973

    Microcontroller LiPo Charger

    My personal preference James would be to use a constant current regulator which you then bypass when you switch over to constant voltage. Lithium batteries as you know do not like being overcharged at all, so you have to be very careful that you don't. You could look at using this device set up...
  6. Arouse1973

    Microcontroller LiPo Charger

    Hello James. Only that its using a BJT not a MOSFET. Adam
  7. Arouse1973

    My First Circuit Board Design - Will this print out well for a transfer?

    That's a good effort. You have some acid traps that might be ok but it's not good practice to have them. Look at the green tracks where the stubs join. They are better to have 90 degrees connections. Sorry if it's too late. Adam
  8. Arouse1973

    Microcontroller LiPo Charger

    Ok you won't get constant current unless you adjust the charging voltage as the voltage of the battery increase. You can't do that. What you will be doing is supplying shorter or longer pulses of a current that will be dependant on the voltage difference between the supply voltage and the...
  9. Arouse1973

    Microcontroller LiPo Charger

    How will the current stay constant? Please explain. Adam
  10. Arouse1973

    Microcontroller LiPo Charger

    Use a P channel like this. This doesn't mean I agree with your circuit but it shows you what I mean. Adam
  11. Arouse1973

    Microcontroller LiPo Charger

    You mean you have changed them to depletion mode? How is your Arduino going to control the charging FET. Your gate driving voltage will need to be quite a bit higher than the battery voltage for it to conduct enough current. You can change the average current through the FET using PWM but you...
  12. Arouse1973

    Microcontroller LiPo Charger

    Hello James, welcome to EP. Your MOSFETs appear to be enhancement type, is this correct. Your Charging MOSFET looks like it's upside down. Check where your source connection should be for a P-Channel type. Also how is this circuit going to supply constant current? What charging voltage are you...
  13. Arouse1973

    Heat Transfer

    Look carefully you should see what I have done with T. Also Trevor gave you a hint for the area calculation. Look at the two formulas and see if you can work out what's going on. Show us your calculations. It would be nice to see where your going wrong. Thanks Adam
  14. Arouse1973

    Heat Transfer

    Here are my workings. Can you see how to get the answer now? Thanks Adam
  15. Arouse1973

    Differential amplifier

    Ok so I expect the opamp you are using cant resolve the low voltage you need. You may need to look at a rail to rail opamp. The LM358 is quite old now. Adam
  16. Arouse1973

    Differential amplifier

    And please answer Bobs first question.
  17. Arouse1973

    Radiogram, no sound

    .? Lol
  18. Arouse1973

    Differential amplifier

    You mean LM358?
  19. Arouse1973

    Differential amplifier

    And the second question please?
  20. Arouse1973

    Differential amplifier

    Are you using a split supply and what opamp are you using? Adam
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