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  1. Minder

    Help select suitable Mosfet for driving relay.

    I use the mosfet interface as shown here, http://tahmidmc.blogspot.com/2013/01/using-high-low-side-driver-ir2110-with.html M.
  2. Minder

    newbe help with schematic to breadboard

    Most breadboards use a standard format, with the 2 or 3 power rails for +ve 0 -ve. the various conductor rails are 5 point all perpendicular to the power rails, IC's etc straddle the centre positioned blank strip. Just start slow with a couple of simple circuits and you will get the hang of...
  3. Minder

    BLDC speed & direction control circuit construction

    SCR bridge type (phase angle) control and PWM are usually two quite different methods. The SCR type requires no Mosfets, but does require some way of reversing. The PMW bridge using Mosfet also requires a DC power supply that the SCR type does not. Here is Tahmids blog that explains the PWM...
  4. Minder

    Login screwed up.

    The site is still showing a screwy initial condition! When going to the site, my avatar shows at the top and the pull down has the usual options including the last which is Log Out. But if I go to any post it says I must log in to post, if I click log in, it says I am now logged out. So it...
  5. Minder

    Question about A/C electricity

    The OP was concerning an ebay simple 3phase low volt generator, typically used for wind vane LED's M.
  6. Minder

    Help select suitable Mosfet for driving relay.

    IRL540 is a logic gate version I use. M.
  7. Minder

    BLDC speed & direction control circuit construction

    One advantage with 3ph rectified DC is that the ripple is virtually nil, and 3x the supply frequency, requiring much less in the way of any smoothing capacitors compared to the same in 1ph rectification.. M..
  8. Minder

    help wiring 3 phase washing machine motor

    Incidentally a 3ph motor that was used extensively for crane hoists, but rarely seen today because of VFD etc, is the wound rotor AC induction motor. Instead of shorting bars, the motor used rotor coils brought out via slip rings, the resultant 3ph was then rectified and a variable resistor bank...
  9. Minder

    BLDC speed & direction control circuit construction

    The question asked included a request for a DC motor, why not go with a simple DC brushed motor, a DC supply is still needed but the controller is much simpler than a BLDC motor as shown. M.
  10. Minder

    Question about A/C electricity

    I don't think there is much danger in this case, 5v - 6v 3ph AC!;) M.
  11. Minder

    help wiring 3 phase washing machine motor

    A few discrepancies in this post, first, 3ph induction motors are used extensively using VFD control and can control a motor down to zero rpm with the correct drive. I have seen a demo of one manuf. illustrate this in a gantry crane lift motor where the load can be held stationary, if needed...
  12. Minder

    Transformer layers direction

    Any sets of windings that are intended to be identical, in most cases are wound bi-filar, or together, to achieve the identical windings M.
  13. Minder

    Advice re inductor on motor neutral

    The motor is a PSC type and already has the capacitor, which incidentally is used for a 90deg phase shift, otherwise no start. The problem is these motors do not control well at lower voltage, although if under 1/2hp, a ramped Triac start might be used. M.
  14. Minder

    Sourcing a Coil

    If changing the use of an AC solenoid coil, just ensure that the correct armature is used and it is seated when energized, other wise you will experience coil failure due to excess current, often better to use a DC coil if possible. M.
  15. Minder

    What is a good way to compare register values in a PIC assembly

    Also the logic instructions can be used in different ways to compare. notably the AND, XOR AND IOR. M.
  16. Minder

    Help needed for transmitting 15V signal to 10 metres at 8KB/s using RS232 or RS422 cable

    So you are converting a non standard RS232 to customary RS232 format. The Micro end (TX) end should be no problem, i.e. MAX232 etc, the RX end appears to require a conversion to standard RS232, typically the voltage range to achieve this is ±9v with max ±25v. You need a bi-polar supply. I would...
  17. Minder

    Electrical stove on DC?

    The element itself is no problem, but there is certain to be AC related circuitry involved that may preclude it being used totally on DC. M.
  18. Minder

    Help needed for transmitting 15V signal to 10 metres at 8KB/s using RS232 or RS422 cable

    I assume the external peripherals have their own contained RS232? If so and you are using a microcontroller, why the CD4094 if using standard RS232 protocol? There are other ways of producing RS232 with dedicated IC's. Doesn't matter what the peripheral end is using, either IC or voltage. I must...
  19. Minder

    Help needed for transmitting 15V signal to 10 metres at 8KB/s using RS232 or RS422 cable

    Any particular reason for 15v? The power for each Conversion IC's is derived at each source and IC's such as the MAX232 is typically used now. Power +ve is not included in RS232 transmission. That distance is not overly far for RS232 unless going super high baud rate. M.
  20. Minder

    Help needed for transmitting 15V signal to 10 metres at 8KB/s using RS232 or RS422 cable

    On the micro end, just use a RS232 MAX232 for example, the charge pump provides the 8.5+/- v. The transmitting end can be any RS232 device. Now it is not customary to use the handshake lines, just the TX/RX lines. M.
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