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  2. 555 timer IC - Wikipedia

    en.wikipedia.org/wiki/555_timer_IC

    555 timer IC. The 555 timer IC is an integrated circuit used in a variety of timer, delay, pulse generation, and oscillator applications. It is one of the most popular timing ICs due to its flexibility and price. Derivatives provide two ( 556) or four ( 558) timing circuits in one package. [2]

  3. Van de Graaff generator - Wikipedia

    en.wikipedia.org/wiki/Van_de_Graaff_generator

    The largest air-insulated Van de Graaff generator in the world, built by Dr. Van de Graaff in the 1930s, is now displayed permanently at Boston's Museum of Science. With two conjoined 4.5 m (15 ft) aluminium spheres standing on columns 22 ft (6.7 m) tall, this generator can often obtain 2 MV (2 million volts).

  4. Personal unblocking key - Wikipedia

    en.wikipedia.org/wiki/Personal_unblocking_key

    A personal unblocking key ( PUK ), sometimes called personal unblocking code ( PUC ), is used in SIM cards to reset a personal identification number (PIN) that has been lost or forgotten. Most mobile phones offer the feature of PIN protection. After switching on the phone, if the PIN security function is active, the user is required to enter a ...

  5. Counter-based random number generator - Wikipedia

    en.wikipedia.org/wiki/Counter-based_random...

    A counter-based random number generation ( CBRNG, also known as a counter-based pseudo-random number generator, or CBPRNG) is a kind of pseudorandom number generator that uses only an integer counter as its internal state. They are generally used for generating pseudorandom numbers for large parallel computations.

  6. PIN diode - Wikipedia

    en.wikipedia.org/wiki/PIN_diode

    PIN diode. A PIN diode is a diode with a wide, undoped intrinsic semiconductor region between a p-type semiconductor and an n-type semiconductor region. The p-type and n-type regions are typically heavily doped because they are used for ohmic contacts . The wide intrinsic region is in contrast to an ordinary p–n diode.

  7. List of UN numbers 1201 to 1300 - Wikipedia

    en.wikipedia.org/wiki/List_of_UN_numbers_1201_to...

    3. Trimethylchlorosilane. UN 1299. 3. Turpentine. UN 1300. 3. Turpentine substitute or mineral turpentine (Australia) n.o.s. = not otherwise specified meaning a collective entry to which substances, mixtures, solutions or articles may be assigned if a) they are not mentioned by name in 3.2 Dangerous Goods List AND b) they exhibit chemical ...

  8. ATM SafetyPIN software - Wikipedia

    en.wikipedia.org/wiki/ATM_SafetyPIN_software

    ATM SafetyPIN software is a software application that would allow users of automated teller machines (ATMs) to alert law enforcement of a forced cash withdrawal (such as in robbery) by entering their personal identification number (PIN) in reverse order. [1] The system was patented by Illinois lawyer Joseph Zingher ( U.S. patent 5,731,575 ).

  9. HTTP Public Key Pinning - Wikipedia

    en.wikipedia.org/wiki/HTTP_Public_Key_Pinning

    HTTP Public Key Pinning ( HPKP) is an obsolete Internet security mechanism delivered via an HTTP header which allows HTTPS websites to resist impersonation by attackers using misissued or otherwise fraudulent digital certificates. [1] A server uses it to deliver to the client (e.g. web browser) a set of hashes of public keys that must appear in ...

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