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  1. Minder

    Garage Door Opener Leak?

    Do you see the motor trying to turn? If so It is usually two things, either the cap is bad or if it is the style that has a plastic worm & pinion, the gear wears and jams. The run cap is not usually on the board but mounted close to the motor. M.
  2. Minder

    Garage Door Opener Leak?

    Are you sure it is not mechanical, is the motor trying to turn? Either the motor could be jammed or the start/run capacitor for the motor is the object leaking. If so the motor will just hum. M.
  3. Minder

    Cooling Fan blowing the fuse

    Have you tried running direct off of 12v and monitor the actual current? M.
  4. Minder

    Building my own bench drill

    We in Canada were allowed to visit Cuba, so I can understand the position you are in. Nice friendly place to visit. M.
  5. Minder

    How to find RPM of motor using KY-040 Rotary Decoder Encoder

    In most instances a simple opto slot detector will work with one or two P/rev. Usually quadrature encoders are used where precise positioning is required. M.
  6. Minder

    MOSFET PWM Circuit Not Working

    It is simple to find the maximum current of a motor, supply a small known DC voltage with a locked rotor and measure the current. Find the resistance, do not use a ohm meter it is not accurate enough method. Also ensure you start with a low PWM signal. M.
  7. Minder

    Why my meter has a beeper?

    Your beeper mode or continuity test, may also function as a diode tester, as many do. This range supplies a degree of current that the Ohms range does not, this enables it to check the validity of a diode, as there requires a degree of forward bias in order for the diode to conduct. Many such as...
  8. Minder

    Building my own bench drill

    Is it possible to get Naval Jelly there, works wonders on rust. M.
  9. Minder

    MOSFET PWM Circuit Not Working

    I thought you are driving a 12vdc motor? I use the IR range IRL series etc. M.
  10. Minder

    Control thyristor via Arduino

    A triac with zero crossing opto isolator/triac driver, AKA SSR, (solid state relay). M.
  11. Minder

    MOSFET PWM Circuit Not Working

    Often large motors will not operate in the lower PWM range and require 50% and over duty cycle before they start turning. I would be inclined to use a lower gate voltage fet, such as logic level gate type. You have <5v available at the gate. M.
  12. Minder

    Help Needed Electric Motor

    It is most likely a R/L suppression network, I would open it up and reverse engineer it if you wish to replace it, there is most likely 2 caps, which are likely to be OK and two inductors, one of which has possibly opened. You could seal it up with either silicone rubber or fibreglass (body...
  13. Minder

    Transformer

    If you are talking about the VA or kVA rating this is the maximum load rating of the transformer, IOW the current demand when supplied with the rated voltage and a suitable maximum rated load applied. This is mainly dependent on core size and suitable winding gauge. M.
  14. Minder

    Help Needed Electric Motor

    I suspect there is a inductor in there also, if so just the cap will not work, does a pair come from the supply and two go directly to the motor? If so you could probably connect the supply pair directly to the motor to test it, There is items such as LC networks available here made by Corcom...
  15. Minder

    Will measuring the resistance of a capacitor damage it?

    The OP shows a simple DMM so I don't expect any voltage above 9v at high impedance. M.
  16. Minder

    Help Needed Electric Motor

    What makes you think the old one is bad, it could be a combined L/C (inductance and capacitance) acting as a suppression device. If so Normally it should work without it as it is probably to suppress brush noise. That link does not load for me. M..
  17. Minder

    Will measuring the resistance of a capacitor damage it?

    Most DMM's do not have the energy capable of doing damage to the majority of components. You should have no problem using this Meter across the cap. M.
  18. Minder

    Help Needed Electric Motor

    Most old sewing machines have Universal motors (AC and Brushes). That appears to be a dual .005uf capacitors, if dual you could use two separate ones, if it IS a Universal motor then this is just a suppression device, and suitable AC voltage rated types would work. M.
  19. Minder

    Will measuring the resistance of a capacitor damage it?

    What kind of DMM do you have that you think will destroy a capacitor? M.
  20. Minder

    Converting 3 phase machine to single phase

    Check the motor terminal block, it most likely has two rows of 3 terminals, and some brass straps. If connected star they will be 3 horizontally across the top, for delta (240) they would be all three vertical 3ph in on each strap. The motor appears to be <1hp so the current rating shown would...
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