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Drive Solenoid with Push Pull

Started by Unknown April 14, 2013
On 4/16/2013 5:57 PM, Jamie wrote:
> Phil Hobbs wrote: > >> On 4/15/2013 10:07 PM, Jamie wrote: >> >>> Phil Hobbs wrote: >>> >>>> On 4/15/2013 9:14 PM, Jamie wrote: >>>> >>>>> Phil Hobbs wrote: >>>>> >>>>>> On 4/15/2013 2:08 PM, Fred Abse wrote: >>>>>> >>>>>>> On Sun, 14 Apr 2013 17:24:38 -0700, Joerg wrote: >>>>>>> >>>>>>>> Or think about a relay: It will pull in when you apply enough >>>>>>>> voltage. >>>>>>>> It will still pull in the same way if you reverse the polarity. >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> Don't bet on it. Lots of relays these days are polarized, and they >>>>>>> don't >>>>>>> always tell you, expecting you to notice the + and - labels. >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> Yup. They have permanent magnets built in. Just ran into that with >>>>>> the RF relays I used in the high-Z TIA we were discussing a couple of >>>>>> months ago. >>>>>> >>>>>> Cheers >>>>>> >>>>>> Phil Hobbs >>>>>> >>>>> Sounds like latching relays, we use them a lot at work.. >>>>> >>>>> Spring loaded PM's in the core of the DC coil. Simply >>>>> select the polarity you need to set the static state of the >>>>> relay. >>>>> >>>>> AC units have an additional pin and diodes inside. they also have >>>>> DC types with additional input, basically a unipolar verses a bipolar >>>>> config. >>>>> >>>>> As for the signal types, we do have some very small ones that >>>>> are not >>>>> very reliable. The magnet will let go under moderate low G-force and >>>>> return to the off state. of course, there are multiple brands and I >>>>> can't say that for all of them because I haven't used them all. >>>>> >>>>> As for polarized (diode shunt) coils, we use those too but only for >>>>> space savers. THe PCB mount types make it harder to route when space >>>>> starts to get too tight at times. I find it some times easier to >>>>> simply >>>>> route a diode pad on the back side of the board under the relay, >>>>> since I >>>>> like using through hole tech for those kinds of components. >>>>> >>>>> P.S. >>>>> >>>>> Been looking at 3D printers lately. I've mentally collected a >>>>> lot >>>>> of different things I can do with it. We'll see how this plays out ;) >>>>> >>>>> Jamie >>>>> >>>> >>>> Check out the Omron G6K series, latching and non-latching. They're >>>> all magnetically biased. >>>> >>>> Cheers >>>> >>>> Phil Hobbs >>> >>> >>> We have more exciting attractions around here, why check out relays when >>> You can go to a cook out! >>> >>>> >>> http://www.norwichbulletin.com/newsnow/x1031157713/Man-dies-after-setting-himself-on-fire-at-Willimantic-gas-station#axzz2QaUcA2KH >>> >>> >>> >>> THis happen saturday in my town.. >>> >>> Jamie >>> >> Brr. My son lives not far from there, in Coventry. >> >> Cheers >> >> Phil Hobbs >> > We have an engineer that lives in Coventry. > > P.S. > I have never heard of any Hobbs in this area, he must > live in stealth.. > Jamie >
Nah, he's a UConn student, or was until this week. He's transferring to UBC in the fall. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 USA +1 845 480 2058 hobbs at electrooptical dot net http://electrooptical.net