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  1. Minder

    motor reverse

    What do you call 'Little'? Small/older sewing machine motor are usually Universal motors and rev pretty high. Also IF it is a Universal motor, you have to swap the field windings WRT the armature to reverse. M.
  2. Minder

    Replacement Transistor

    As long as it is within the present working range of the circuit, +v supply level etc. M.
  3. Minder

    Replacement Transistor

    There you go. http://www.weitron.com.tw/PDF/2SB1116.pdf It is just a general purpose type, should not be difficult to sub. M.
  4. Minder

    latching pushbutton help

    Looks a higher quality motor also. M.
  5. Minder

    Hall sensor A1122LUA-T resistance

    A 330-470 ohm resistor minimum will work, I have used a 1k in similar applications. M.
  6. Minder

    latching pushbutton help

    The torque of a DC motor is usually maximum at zero rpm and stays fairly flat over the rated rpm range, but I agree a reduction of some kind may be an advantage, depending on the present torque required. M.
  7. Minder

    latching pushbutton help

    50rpm should be possible, the problem is with motor control is if the load varies, without a feedback element of some kind it is usually hard to control rpm if the load varies. M.
  8. Minder

    latching pushbutton help

    There is PWM controllers on ebay for these kind of motors for about $5.00. ebay 141647039024 They are designed along these lines. http://www.discovercircuits.com/DJ-Circuits/simplepwm2.htm Both of the above are controlled by a potentiometer, which you could replace with pre-set resistors. You...
  9. Minder

    latching pushbutton help

    That type of control or switching is called a 'Radio Button.' It can be set up with relays, or there off the shelf ones. Still no word on the type of motor?? Seems like Over-engineering going on. M.
  10. Minder

    latching pushbutton help

    This has many typical control circuits that can be used or adapted as needed. http://static.schneider-electric.us/docs/Machine Control/0140CT9201.pdf Which motor are you controlling, the AC drill motor or is it DC? M.
  11. Minder

    latching pushbutton help

    If you are trying to reverse a ac drill motor they are usually Universal motors, the wound field is in series with the armature, the field has to be reversed with respect to the armature. A DPDT SW with centre off will do it. With these motors, usually triac control is used. M.
  12. Minder

    Help, Using Arduino to high current 12volts inputs and output

    For the inputs you could use a series resitor and an 5v Zener, the input would come from the junction of the R & Z. For outputs use a mosfet with a logic gate input. The 2n7000 is usefull for low current level outputs, or if more than a few, the ULN2805.. M.
  13. Minder

    Hall sensor A1122LUA-T resistance

    I think that is basically what I said, the OP would need to show what he intends driving and what Vs supply. M.
  14. Minder

    Hall sensor A1122LUA-T resistance

    The vout pin connects to whatever device is sensing the output, it is a little low to drive any device direct, it is common to input into a high impedance device such as a TTL or microP. If you use a opto isolator for example the series resistor of the opto has to be taken into account. What do...
  15. Minder

    Hall sensor A1122LUA-T resistance

    You need to size the resistor based on the voltage you are using on the output. The output consists of a open drain mosfet with a max drain current of 25ma. So calculate the minimum resistor value based on the voltage used, also allow for any resistance in the load itself, i.e. sourcing resistor...
  16. Minder

    PIC programming

    BTW if you need a tutorial on the 16F628 see Nigel Goodwins Tutorial series. M.'
  17. Minder

    Polarity change for linear actuator logic question

    According to the spec sheet they will still stay latched on DC unless it transitions to a very low level. Once triggered. M.
  18. Minder

    PIC programming

    Not quite sure of the question? The 628a manual gives you all the information. M.
  19. Minder

    3 phase motor as generator. Power output?

    There are different types of 3ph P.M. motors used as generators, a 3 phase bridge would be better. Is this a ECM motor off a furnace or HVAC etc? M.
  20. Minder

    Light flicker (Triacs)

    Where did the controller originate or is it home built? Burst firing usually entails zero crossing switch on an remain on for a few seconds to many seconds at a time. No frequency control of the AC.? M.
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