Search results

Search Forums New Posts
  1. (*steve*)

    Solar charging a LiFePO4 Battery (advice welcome!)

    Charging from the alternator will possibly be ok, but ensure you isolate the batteries using a diode. To batteries of the same type in parallel are generally ok, but if they have different chemistries as they do in this case can easily lead to one battery discharging into the other. An...
  2. (*steve*)

    Battery charger

    It means you charger the battery, stop charging it, discharge it somewhat, then start the process again.
  3. (*steve*)

    accutronics geneva reverb tank and reverb amp.

    If advise you to Google for circuits people have used. My knowledge is not based on actual experience :) In any case, it's always worth familiarizing yourself with the available options.
  4. (*steve*)

    accutronics geneva reverb tank and reverb amp.

    Yeah, there's a few errors :) Are the points labeled "F" connected together? If so, 4 will be a drive for the reverb unit (other side will be ground) 1/10 (near Q5) is probably the input from the reverb.
  5. (*steve*)

    Boolean expressions simplification

    Only if I can get the credit from your course. Did you also try what I suggested? Perhaps you should post what you get when you apply de Morgan's theorem to the first problem. I can check it, and suggest the next step (hint - I already have)
  6. (*steve*)

    MOSFET getting hot and making noise

    BTW, it's the inductor that is singing to you, and my differential diagnosis is avalanche breakdown of the MOSFET or poor gate driving.
  7. (*steve*)

    MOSFET getting hot and making noise

    It sounds like there is some difference between the circuit you breadboarded and the circuit you now have. Is there output voltage correct? Does the problem happen even if there is no load connected to the power supply? What is the input current? It might be worth checking that D4 is not...
  8. (*steve*)

    Battery charger

    Yes set it to between 6.75 and 6.90 volts. Hopefully the charger is internally limited to 500mA.
  9. (*steve*)

    Battery charger

    The battery should have the charging voltages printed on it. Use the lower "float" charge value. If it's not marked, 6.9V should be about right. If you can set the current limit, set it to about 1A.
  10. (*steve*)

    Portable Power Supply

    That would be a boost converter. A buck converter reduces the voltage. :)
  11. (*steve*)

    MOSFET getting hot and making noise

    I would check to see if the MOSFET is a lot hotter than the heatsink. If it is, check for thermal resistance issues (loose attachment, lack of thermal grease, etc.). If they're both hot, check that the gate is being driven correctly. If it's neither of these, check that the current through...
  12. (*steve*)

    What cap, what resistor?

    That's the whole point of it :)
  13. (*steve*)

    Hi Everyone from Calgary

    When I've taught people to do surface mount soldering, I've given them standard soldering irons and 3mm solder. Whilst you probably don't want to use this as a preferred set of tools, it pays to get used to solder that dwarfs your pins. Eventually, as you solder finer and finer pitch devices...
  14. (*steve*)

    1n4007 is getting hot

    Well, if you're expecting something the size of a 1N5404, then smaller is ok. If it's smaller than a 1N4001, then yeah, that's a strong possibility.
  15. (*steve*)

    Connecting LED Array to a microController?

    No, that's probably ok. A MOSFET should be able to switch it quite easily. What frequency do you want to switch it at? For what purpose?
  16. (*steve*)

    Connecting LED Array to a microController?

    Ok, if it's flashing rapidly a relay is not a good option -- it will quickly wear out.
  17. (*steve*)

    Connecting LED Array to a microController?

    Ok. Do you have a multimeter? (very handy, but not absolutely essential) Do you have a soldering iron? Are you planning to just switch this array on and off relatively infrequently, or many times per second?
  18. (*steve*)

    Dim display repair

    Are the dim segments used for things that are displayed continuously? They could just be worn out. Or did this happen suddenly?
  19. (*steve*)

    accutronics geneva reverb tank and reverb amp.

    Essentially you'll have 2 amplifiers and a mixer. One amplifier drives the springs, another amplifies there output from the other end of the springs, and a mixer determines how much signal comes from the original source vs through the reverb unit. Figuring out the topology of the board is the...
  20. (*steve*)

    Hi Everyone from Calgary

    Howdy. I can relate to much of your background, including the eyesight stuff. I am pretty heavily into surface mount, even though I now have trouble reading the colour bands on 1/2 W resistors -- with my glasses on! There are two things I rely on. First is magnifying headsets, second is the...
Top