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  1. Minder

    How to power an induction hob coil

    Also you could experiment to try seeing what the minimum amount of ferrous material (steel) could be used to enable the stove turn on? M.
  2. Minder

    How to power an induction hob coil

    How about the thickness of steel, can it be reduced? M.
  3. Minder

    Newbie: Solenoid timer circuit

    The solenoids require to go to +24v Supply also pin 10 goes to 24v+, pin 9 goes to common. M. .
  4. Minder

    How to power an induction hob coil

    Did you try the spacer/stand off method to reduce the inductive field range. You may have to get a schematic of the cooker in order to modify it, sometimes this is attached at the back etc. M.
  5. Minder

    Vacuum pump: DC or AC

    Another very simple way to detect if DC is to spin the motor and see if it generates, also short the two leads and see if there is greater resistance than open when spun. M.
  6. Minder

    Newbie: Solenoid timer circuit

    On the ULN Darlington packages the emitters are all common, collector output, they also have a BEMF diode included. M.
  7. Minder

    Vacuum pump: DC or AC

    That appears to be a DC motor, also the presence of a an electrolytic cap would indicate it, as well as the +- marks. M.
  8. Minder

    I'm a little bit lost with transistors... need help

    I think you will find the likes of the 2n7000 very useful for interfacing with micro's etc, I tend to use mosfets over bi-polar where possible. There is also 7 & 8 Darlington drivers in DIP packages such as ULN2803 etc. these include the BEMF diodes for inductive loads also. M.
  9. Minder

    I'm a little bit lost with transistors... need help

    You might also want to look into Mosfets, for starters and interfacing with low drive TTL/CMOS/μproc electronics there is a 2n7000 'Fetlington' mosfet version of the darlington. it does not impose the same level of required base/gate drive that a bi-polar does. M.
  10. Minder

    Need a little help on circuit for 120VAC to 12VDC

    And the point of whether regulation is even needed, without detail of the nature of the actual load required to be operated?? M.
  11. Minder

    Is there a way to send a program from my arduino to my computer?

    RS232, if you have a COM port. M.
  12. Minder

    Need a little help on circuit for 120VAC to 12VDC

    I beg to differ, I have used the 78H12A up to 5a, no problem. There are a few examples out there also. M.
  13. Minder

    Need a little help on circuit for 120VAC to 12VDC

    TO3 version with heat sink. M.
  14. Minder

    Need a little help on circuit for 120VAC to 12VDC

    Regulator still only needed depending on 12v device driven! Also if unregulated 12vac secondary will give approx. 16vdc M.
  15. Minder

    Need a little help on circuit for 120VAC to 12VDC

    The components I listed will output ~12VDC but not regulated without a electronic regulator IC such as the 7812 mentioned, without it the 12v could fluctuate slightly with load and AC source voltage drop, it all depends what you are using the 12v for and type of device. Example DC motor, lamps...
  16. Minder

    Need a little help on circuit for 120VAC to 12VDC

    Do you need regulation? 1 -120v - 9v secondary 70va transformer. 1- 10 amp bridge rect. 1- 1000μf capacitor. 1- 7812 (if regulation needed). M.
  17. Minder

    Continuity testing wire capacitance

    You may be able to do it with a capacitance meter, the cable requires at least two conductors and you need to know the gauge of the wire and separation distance, there are calculators out there to assist. http://www.ampbooks.com/mobile/amplifier-calculators/wire-capacitance/calculator/ M.
  18. Minder

    Newbie: Solenoid timer circuit

    Use a ULN2803 UDN2981 or any of the similar darlington drivers. M.
  19. Minder

    motor controller

    If the speed input is ±10vdc then usually a Pot and a -10v 0v +10v DC supply is needed, if not provided on the drive, the alternative is a 0-10v for the pot and an input terminal for reversal (1 or 0). Presumably you have the manual for the drive and hookup details for the motor, 3 power and...
  20. Minder

    motor controller

    The controller appears to take a pot input for rpm. In the short blurb it does not mention if this is 0-10vdc or ±10vdc for bi-directional. It also looks like there is S/W avail for configuring the drive. You need to get the right sequence for the Hall sensor commutation. M.
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