Contacts are normally included with the D38999 D38999 series of connectors, however a number of exceptions do exist.  One of them is when the part number used to order the connector has an “-LC” suffix at the end.   Another exception is how the part number is assembled.  Normally at the end of the part number there’s a “P” or ‘S” to denote the gender of the contacts used in the connector (“P” for pins, “S” for sockets).  If these are switch to an “A” or “B”, then the contacts are again omitted and must be purchased separately.   Some example part numbers are shown below.

These 2 part numbers include contacts.

D38999/20JE26PN

D38999/20JE26SN

While the 3 below do not include the contacts

D38999/20JE26PN-LC

D38999/20JE26AN

D38999/20JE26BN

Please review the manufacture’s documentation for full ordering details as well as options for specific applications.

            The “Volt-Ampere” is the measure of “apparent power” and is used primarily in circuits using alternating current (AC).  The Volt Ampere (VA) consists of 2 components, the first is the real power known as Watts, while the other is the reactive power known as VAR (Volt-Amps-Reactive).  The following equation shows how the 3 terms are related:  VA = (W² + VAR²)^1/2.  In DC circuits, the VAR term drops to 0 since reactive power doesn’t show up in DC.  More information on this topic can be found here

A common graphical representation of the relationship between these three components is the power triangle.  The real power (Watts) makes up the adjcent leg, reactive power (VAR) makes up the opposite leg, and the apparent power (VA) is the resulting hypotenuse.

            Not necessarily!  Op-Amps can have the “Rail to Rail” feature on the input only, output only, or both.  Different circuit parameters can also affect just how close to the rail the Op-Amp can go (for example, the load current can limit the output voltage of an op-amp with rail to rail output).  Be sure to check the manufacture’s datasheet to ensure its configuration will match your requirements.

     The outputs of some sensors will behave like transistors, when a sensor senses an object it will trigger the transistor controlling the output (which essentially acts like a switch) and depending on its design it’ll act as an NPN or PNP type transistor.  An NPN output is commonly called a “sinking” output.  When the sensor senses an object it will connect the output to the negative supply.  A PNP output is commonly called a “sourcing” output. When it senses an object it will connect the output to the positive supply.  If you’re unsure of which output type you need, a number of manufactures produce sensors with configurable outputs. In this case the sensor can be configured to operate as an NPN or PNP type.  NPN, PNP, and Configurable type sensors come in a Normally Closed and Normally Open configurations.

            The fans from the Multicomp brand that feature the “Vapo Bearing” have an extra magnet in the motor and shaft area. This extra magnet helps to stabilize the rotating fan reducing friction between the shaft and the bearing.  In this increases the life of the fan while reducing motor noise.