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  1. Minder

    Question about transistor

    How much? is the current gain, Mosfet is a transconductance amplifier, similar to a valve (tube). M.
  2. Minder

    Getting Feedback on Flow Sensor

    The link to the sensor does not show any electrical specs? M.
  3. Minder

    300 V DC Power Supply

    Then it is optional, depends how much effort you want to put into it. What is the application it is needed for? M.
  4. Minder

    Light switch

    It must have been later than that, I remember using them in the electrical industry in the '50's. I personally do not like them, but I must say the N.A. version (wire nuts) is quite a bit different to the old UK ceramic ones. M.
  5. Minder

    300 V DC Power Supply

    A suitable design would be based on whether you want regulation or not? M.
  6. Minder

    Dc motor - SCR - BR help.

    You Can use a Triac controller with a DC motor, just place the bridge after the Triac and and wire the motor 'inside' the bridge. The Chinese often use 'SCR' instead of 'Triac'. Generally they are used for Universal motors. It gives you a similar control to the KB DC SCR bridge motor...
  7. Minder

    300 V DC Power Supply

    UK 230 gives you ~320VDC, you could regulate or if not needed, use a buck-boost transformer to drop the 20v. Or if using a toroidal Txfmr easy to take a few turns off. M.
  8. Minder

    Single phase

    240 1ph service is mainly used in the area of residential supply, and 10HP represents a high single load for this kind of service, Once you get above a demand of over 10HP for equipment, the more efficient method is to use 3 phase and a higher voltage, 360/420/575/600 etc. and would be...
  9. Minder

    Motor for back and forth

    You would need to monitor and document the mean current when the mechanism is in proper operation under different conditions , for e.g. will it be exposed to wind resistance etc. M.
  10. Minder

    Motor for back and forth

    If the system has the capacity, but if the sign is running 24/7, or for long periods at a time, you may have a problem. M.
  11. Minder

    Motor for back and forth

    Try and find an auto wrecker where you can strip your own, this way you can use whatever you need or adapt. The other option is a linear actuator, but not as cheap, maybe! M.
  12. Minder

    D-sub crimping+connecting practice & choice of tools

    If not that high number of connectors, there is always the soldered version which requires small heat shrink to cover the pins. A good quality D pin crimper can be expensive, but a little fast than soldering. M.
  13. Minder

    Resistor Pull-Up/Down Problems With Relay Driving Circuit And Darlington Transistor

    For me the 2n7000 ( Fet equivalent darlington). is the choice. M.
  14. Minder

    Dual Speed Control Circuit

    From Canada my goto is Digikey, but there are others such as Mouser and Jameco etc. M.
  15. Minder

    Dual Speed Control Circuit

    One source of Vero (strip board) is here, half way down the page. Prototyping Boards You can also place .2" spaced screw terminals for power connections. M.
  16. Minder

    Dual Speed Control Circuit

    The lever is available by part No. CAA1M but may be a little short, .6mm piano wire can be used to make a custom length. M.
  17. Minder

    Dual Speed Control Circuit

    If wishing to reproduce it, it seems to be a very easy circuit to reverse engineer? M.
  18. Minder

    Rapidly change electro magnet polarity.

    What sort of magnetic effect are you hoping for switching that fast? M.
  19. Minder

    DC Actuator problem

    Seems quite a sophisticated board, what does it control? M.
  20. Minder

    ZIF-sockets from eBay etc -quality OK?

    I picked up a qty of the ZIF sockets off ebay (China) mine were marked Textool, I'm sure they were knock-off's but I couldn't find any difference between the 3M's I had already. M.
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