Search results

Search Forums New Posts
  1. Alec_t

    current sense issue in BLDC motor

    You could change the software so that transients are ignored.
  2. Alec_t

    Battery eliminators for Smartphone devices

    I don't have a smartphone, but don't most of them allow use of the phone at the same time as the phone battery is charging from a mains-powered charger? If so, they already effectively have a battery eliminator!
  3. Alec_t

    Battery eliminators for Smartphone devices

    How would you add one internally? There isn't much free space in a phone :confused:
  4. Alec_t

    Touch sensitive antique radio volume knob

    Your body is probably acting as an antenna extension or enhanced ground, improving the signal reception.
  5. Alec_t

    Charging 6 volt battery with a 12 volt charger and small lightbulb

    Welcome to EP! Whether or not it is SAFE to do that depends on the characteristics of the charger and the battery. An old-fashioned heavy-duty charger with nothing more than a bit of resistance wire as a crude current limiter could well drive excessive current through the battery and cause a...
  6. Alec_t

    Help to identfy a battery connector

    If it were me, and it's for a one-off tester, I'd probably make the plug from a bit of 2mm pitch header strip plus a polarising mount of some sort.
  7. Alec_t

    Help identifying unknown component (SMD Diode?)

    Very confusing. However, the package size is bigger for the higher wattage device.
  8. Alec_t

    Dither for PWM circuit driving a proportional solenoid

    This article may be helpful.
  9. Alec_t

    Dither for PWM circuit driving a proportional solenoid

    I think you need to set up the main PWM frequency, then use code to jitter the register value (in OCR2A/B) which sets the main PWM duty cycle. From what I read (I'm not familiar with Arduino), although the default 'Fast PWM' mode has only a few preset frequencies it is possible, as Kelly says...
  10. Alec_t

    Dither for PWM circuit driving a proportional solenoid

    Welcome to EP! So, you want a 122Hz dither frequency, but what wll be your main PWM frequency?
  11. Alec_t

    Ultrasonic Water Level Sensor design

    Yes. Perfectly possible for a receiving transducer and if 'tx' is interpreted as 'having been transmitted'. If, on the other hand, you are referring to the emitted acoustic signal, then perhaps a 'bat detector' could be used to monitor that.
  12. Alec_t

    Ultrasonic Water Level Sensor design

    An oscilloscope.
  13. Alec_t

    Issue in driving sensored BLDC motor

    What are the component values?
  14. Alec_t

    Help finding a switch

    Don't forget a current-limiting series resistor.
  15. Alec_t

    Help finding a switch

    What battery will you use?
  16. Alec_t

    NE555, LM7805, and MC34063

    Building a discrete-parts equivalent of the MC34063 will be an even greater challenge than the 555!
  17. Alec_t

    Component to cut off current to parts of low power circuit

    Welcome to EP! A MOSFET will do nicely. Look for a 'logic level' type with a Vgs(th) as low as possible (say ~1V).
  18. Alec_t

    Digital Signal Is Transmitted?

    Morse code.
  19. Alec_t

    Running 24v led lights through a dimmer. Help!

    Are you poking mains voltage into a dimmer rated for 12-24VDC? :eek:
  20. Alec_t

    Inductor number L2001 melt-down

    L2000 appears to be connected in series with both data lines of the USB, so my guess is it's a common-mode choke.
Top