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  2. Relay - Wikipedia

    en.wikipedia.org/wiki/Relay

    SPST-NC (Single-Pole Single-Throw, Normally-Closed) relays have a single Form B or break contact. As with an SPST-NO relay, such a relay has four terminals in total. SPDT (Single-Pole Double-Throw) relays have a single set of Form C, break before make or transfer contacts. That is, a common terminal connects to either of two others, never ...

  3. Automatic test switching - Wikipedia

    en.wikipedia.org/wiki/Automatic_test_switching

    Figure 1D illustrates a double-pole, double throw (DPDT) switch. Contact form, or simply form, is the term relay manufacturers use to describe a relay's contact configuration. "Form A” refers to a single-pole, normally open switch. "Form B" indicates a single-pole, normally closed switch, and "Form C" indicates a single-pole, double-throw switch.

  4. Multiway switching - Wikipedia

    en.wikipedia.org/wiki/Multiway_switching

    A "4-way" (intermediate) switch is a purpose built double pole, double throw (DPDT) switch, internally wired in manufacture to reverse the connections between the input and output and having only four external terminals. This switch has two pairs of "traveler" terminals that it connects either straight through, or crossed over (transposed, or ...

  5. H-bridge - Wikipedia

    en.wikipedia.org/wiki/H-bridge

    A "double pole double throw" (DPDT) relay can generally achieve the same electrical functionality as an H-bridge (considering the usual function of the device). However a semiconductor-based H-bridge would be preferable to the relay where a smaller physical size, high speed switching, or low driving voltage (or low driving power) is needed, or ...

  6. RF switch - Wikipedia

    en.wikipedia.org/wiki/RF_switch

    Single pole double throw (SPDT) switch from Agilent Technologies. Multiport switches or single pole, multiple throw (SPnT) switches allow a single input to multiple (three or more) output paths. Transfer switches or double pole, double throw (DPDT) switches can serve various purposes. Bypass switches insert or remove a test component from a ...

  7. Buzzword of the Week: Tent Pole

    www.aol.com/news/2011-02-14-buzzword-of-the-week...

    The term's origins are murky: Some scholars have linked it to the military or to circuses, and one of its permutations -- "long pole in the tent" -- makes particular sense when connected to the ...

  8. These are the pedophile symbols you need to know to protect ...

    www.aol.com/news/2016-04-26-these-are-the...

    A FBI document obtained by Wikileaks details the symbols and logos used by pedophiles to identify sexual preferences. According to the document members of pedophilic organizations use of ...

  9. Double switching - Wikipedia

    en.wikipedia.org/wiki/Double_switching

    A double-switched relay cannot close inadvertently with the application of the same current. At least two separate faults would be required to allow this relay to close inadvertently. Double switching , double cutting , or double breaking is the practice of using a multipole switch to close or open both the positive and negative sides of a DC ...