Search results

Search Forums New Posts
  1. B

    DC 15 seconds motor timer operated via push switch

    So you want the motor to do approx. 15 rpm in 15 seconds?
  2. B

    magnetic switch/connector

    Metal part glued to the reed will probably shield against the field and hence be a flop.
  3. B

    Merge power from car battery and normal electrical supply

    Emergency egress lighting is normally looked upon as long term where I come from.
  4. B

    Conductive Foil

    Applications such as this usually employ rotary or linear encoders.
  5. B

    Tablet charger can't keep up - wire in perm't power

    Have you checked the existing charger is actually delivering what you expect.? I saw it reported here not so long ago that some of these units are over-rated.
  6. B

    R/C Relay Driver

    Pick a lv comparitor that has rail to rail switching.
  7. B

    Battery charger repair

    You will need to use the "diode test" on the meter. Reading depends on the meter as some are internally reversed. Test on a known diode like say a 1n4004 or similar to see polarity of your meter.
  8. B

    Fan motor: brushed or brushless

    Yes, I think perhaps the shaded pole shorting rings might be located on the inner face of the extended section of the poles.
  9. B

    Battery charger repair

    You originally said the common from the transformer was the negative charge lead so ....yes. Diagram below
  10. B

    R/C Relay Driver

    Pick a different comparitor. When loaded, the 358 will drop it's output too low.
  11. B

    What's so special about mini-MELF 1N914s?

    Does it relate to the package? Bulk refers to a package (usually a bag) of loose unorganized parts, and is usually unsuitable for automated assembly machines. Bulk parts are packaged according to the ESD (ElectroStatic Discharge) and MSL (Moisture Sensitivity Level) protection requirements...
  12. B

    Battery charger repair

    you could use stud mount diodes. 4 x cathode to the stud.
  13. B

    Fan motor: brushed or brushless

    Fan motors usually have the cap mounted remote from the motor i. e in the base or/ could be shaded pole motor. Either way it is frequency dependant which cannot be controlled the way you think.
  14. B

    Analog Voltage recognition by Microcontroller ADC

    In that case would it not be better to count the frequency pulses ?
  15. B

    Analog Voltage recognition by Microcontroller ADC

    If the resistors in fig 1 are appropriate levels and you wrote the program correctly, it should work ok.
  16. B

    What's this part?????

    Tuning coil.
  17. B

    Repairing a motherboard

    Will need to be insulated.
  18. B

    Ic=C x dv/dt

    First line says "watch the videos". I'm guessing the answer may be in there.
  19. B

    Transistor voltage measurement

    NPN or PNP?
  20. B

    Arduino Board for coil winding machine, any code out there?

    I used 8mm guide rails and linear bearings as that is the smallest commercial size I could find. Could have made them myself but as it turns out they are relatively cheap. Bought from Banggood online. You can get complete kit of parts including feed screws. Minimum pitch was 2mm which was way...
Top