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  1. Minder

    Increasing the output voltage of a step-down transformer by reducing the number of coils

    Much easier to add turns to the secondary, As per Alec_t , you should never if possible reduce the primary winding using the same input voltage. .
  2. Minder

    A simple electric fence idea

    Ensure the pulse is very short, milli-seconds. .
  3. Minder

    2 latching relays, 2 pushbuttons, 2 dc 5 Volt motors and 4 limit switches

    I didn't study the circuit in detail, but it is common to use NC L.S with a diode rectifier across the switch, When the actuator reaches its limit, the switch opens and disconnects the motor, but the L.S. diode polarity "arms" it for the opposite direction.
  4. Minder

    A simple electric fence idea

    Using the waste-spark type of coil assures isolation, the secondary is rated at 30Kv. ;) I used a mains step down transformer for the 12v -15v DC, so virtually dual isolation from the mains. Two consecutive pulses, every second.
  5. Minder

    A simple electric fence idea

    Both spark plugs fire. but one of the cyl is on the exhaust stroke, hence 'Waste' spark. I just built a successful E.Fence. using one such coil, works like a charm.
  6. Minder

    A simple electric fence idea

    You can obtain the automotive ignition coil from a local wrecker, the modern ones are isolated versions, also known as waste spark type..
  7. Minder

    Is this a transformer???

    What did it come from? Looks a little like a relay!!
  8. Minder

    Discrete interface for 24V with microcontroller

    Logic level Mosfet maybe?
  9. Minder

    Ground plane PCB

    You can see which are traces, (conductors), they connect to component pins.
  10. Minder

    Pot identification and alternative

    It appears to be a 10K, did you measure it? Usually at that value it is linear, not logarithmic track.
  11. Minder

    RELAY Omron

    If you only have an AC source, then use a small bridge rectifier to supply the coil. Observe the right polarity.
  12. Minder

    Wind powered generator using radiator fan?

    As was done with the original Edison DC generator, you do not necessarily require a separate supply for the fields. The output of the generator is in parallel with the fields and once turning, there is enough residual Magnetism to start generating. The generator will then pull itself up by its...
  13. Minder

    RELAY Omron

    BTW, if it does have the LED indicator as it appears, the correct 12vdc coil polarity has to be observed. All the Omron cube relays i have used, have the diagram/legend of the connections on the top of the cover
  14. Minder

    RELAY Omron

    Normally on Omron relays, they have the terminal diagram on the side of the cover. The bottom left terminal pair in the picture is the coil. you can see what appears to be a LED indicator connected to it on the RH side .
  15. Minder

    I Want to Create a Revolutionary Table Fan!

    Like a revolutionary motor!?
  16. Minder

    I Want to Create a Revolutionary Table Fan!

    The typical fan to date has often been the AC induction motor with shaded pole, these run very hot and are inefficient. I see there is already a company making them with ECM (PWM) motors which are very efficient and portable. How are you going to make a product that is more efficient than a...
  17. Minder

    Problem with Treadmill

    Is there any model No on the board? Unfortunately there is only a couple of reverse engineered schematics for a some of the better known models.
  18. Minder

    Wanted: 110 volt AC Electric motor

    I am not sure you will find a 5HP for 120vac. Even if you could find one the 120v current of 30a-40a would still be required before conversion. Seeing you are in N.A., can you not supply the 240v 1ph for a suitable one?
  19. Minder

    Wanted: 110 volt AC Electric motor

    You will be hard pressed to find a 120v 5hp 1ph motor. Your best bet is a 240v 3ph version with a VFD. 240v 1ph supply.
  20. Minder

    Wanted: Ac step up transformer

    If Va is relatively low, you can run a 120v/230 version 'backwards'.
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