Search results

Search Forums New Posts
  1. Alec_t

    I have to replace two burnt mosfets K5A50D in a toshiba hd tv.These mosfets are not available in the

    Welcome to EP! I doubt that would be a suitable replacement, but it all depends on the circuit it's used in. A Vgss rating of +-30V is uncommon. Most FETs are rated +-20V only, so it's unlikely a manufacturer would specify a higher voltage type unless it were strictly necessary.
  2. Alec_t

    Simply Sunday afternoon project turned nightmare!

    I don't do Apple either, but this might work : 1) Measure how long (Tdis hrs) it takes for the phone battery to discharge to, say, half charge, 2) measure the recharge time (Tch hrs), 3) use a 12V timer module to switch on the charger every Tdis+Tch hrs, and power the charger for Tch+1 hrs.
  3. Alec_t

    Sending MIDI signals via PIC's Usart module [SOLVED]

    Then use the Report button to ask a mod to edit the title for you.
  4. Alec_t

    Sending MIDI signals via PIC's Usart module [SOLVED]

    Yes. Add [Solved] at the start of the thread title.
  5. Alec_t

    Sending MIDI signals via PIC's Usart module [SOLVED]

    Start and stop bits are essential. See, for example, this description of the MIDI physical layer.
  6. Alec_t

    Sending MIDI signals via PIC's Usart module [SOLVED]

    That's a 'note off' command. You want 0x9C for 'note on' on channel C.
  7. Alec_t

    Detect AC Power supply

    You can't get a negative voltage out, since the '814 output transistor is only connected to a +5V supply. What AC voltage are you trying to detect? 110V mains?
  8. Alec_t

    Woo-Woo Is it possible to attenuate a signal not at the source

    Tin foil hat?
  9. Alec_t

    Piezo's. Both running them over distance and pre amps

    Looks good.
  10. Alec_t

    Acer Aspire 4310 laptop power shut off after 2 seconds

    In that case I'd suspect the main battery has come to the end of its useful life. Even if the laptop works without a battery, the BMS may be shutting down the laptop as a safety measure to prevent chargibg of a faulty battery.
  11. Alec_t

    Piezo's. Both running them over distance and pre amps

    Twisted pair cable, or screened cable, would keep noise/hum pickup to a minimum. Any capacitor would likely be more effective at the mixer end of the cable. Pre-amplification is clearly needed if you're having to crank the mixer to maximum gain.
  12. Alec_t

    Replacement for .5 MFD / 300 VDC Capacitor

    Have you checked that the centrifugal mechanism isn't seizing and that it's contacts are in good clean condition? Any crud or stiffness preventing the contacts closing effectively could result in the resistor passing current for longer than expected and hence overheating.
  13. Alec_t

    Replacement for .5 MFD / 300 VDC Capacitor

    Can you bypass the speed control and wire the motor to mains via a suitably rated fuse, to test if it runs correctly at full speed? If it does, then that would suggest the OEM resistor is indeed inadequately rated (assuming it is correctly wired) but doesn't explain how it survived up to now.
  14. Alec_t

    6v to 12v conversion for toy car

    Welcome to EP! Replace the motor with a suitable 12V-rated one and install a 12V battery. You will also probably need to replace the BEC with a 12V-rated one to supply the radio/IR receiver. Be aware that the gearing from the motor to the wheels may not stand up to the higher torque which a more...
  15. Alec_t

    heated jacket

    You wouldn't want to be in clothing at 50C for very long! That's painfully hot.
  16. Alec_t

    Replacement for .5 MFD / 300 VDC Capacitor

    If the 300Ω resistor is in series with the motor winding to reduce the speed but is obviously passing excess current, then it seems likely the motor winding has a short-circuit fault.
  17. Alec_t

    PWM setup

    Agreed. My bad.
  18. Alec_t

    Printing on cartoon box with industrial printer

    You need to program the computer to read the sensor's output, count the output signals and drive the printer accordingly.
  19. Alec_t

    PWM setup

    Then you would be exceeding the 12W power rating of the driver.
  20. Alec_t

    Handset is charging but cant pass 3%

    The problem is likely either a dying/dead battery or a faulty charger. Does the charger work ok with a different battery of the same nominal type and voltage?
Top