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DescriptionThis is the Teensy 4 Audio Shield(Rev D)that can be added to a Teensy 4.0 for your next audio project. The shield provides you with an easy-to-use tool to add high quality 16 bit， 44.1 kHz sample rate audio to your Teensy. With the audio li

DescriptionThe SparkFun ProtoShield Kit lets you customize your own Arduino shield using whatever circuit you can come up with and then test it to make sure everything is working the way it should! The SparkFun ProtoShield Kit is based off the Arduino R3's footprint that allows you to easily incorporate it with favorite Arduino-based device.One of our favorite features with this version of the ProtoShield Kit is the solderable-like breadboard prototyping area! Half of this area was designed with a breadboard in mind. On the underside of the shield you will be able to see open jumper pads between each through hole to make a connection like a breadboard. Once you add a component， simply add a solder jumper between holes to make a connection. For those that prefer the standard prototyping pads， we left the other side(near the BlueSMiRF and Serial UART ports)as is.We have also moved the prototype testing components(those used to make sure your circuit works effectively)off of the "mainland" of the shield and onto a ProtoSnap styled， removable PCB. On this test area you will find soldering areas for the two yellow 3mm LEDs(as well as pins to control and power them)， two 330 Ohm resistors， a 10K Ohm resistor， and a pushbutton.Note：Since this product is a kit， assembly and a basic knowledge of soldering will be required. The SparkFun ProtoShield Kit does not come pre-assembled.Get Started With the SparkFun ProtoShield Kit GuideFeaturesArduino R3 FootprintSoldering KitSolderable-Like BreadboardBlueSMiRF or Comparable 6-pin PinsDetachable Test Area

DescriptionDo you need help soldering a difficult project， reworking a botched pin or just making your life easier? This 10mL no-clean flux pen from Chip Quik(R)is great for all of your solder， desolder， rework and reflow purposes! For those of you unfamiliar， flux is a handy substance that prevents beading of the solder and helps the solder flow cleanly onto the parts you are soldering. This is a must-have tool for any hobbyist's workbench.Each of these flux pens can be used in leaded and lead-free applications and is VOC， halide and rosin free --- making it RoHS II and REACH compliant. Since this is a "no-clean" style flux， you won't have to worry about any sort of conductivity issues associated with it interfering with your board or project. However， it is advisable to still clean whatever you are using this flux pen on with basic isopropyl alcohol(IPA)， because a clean board is a happy board!Note：It isn't recommended to use this flux with solder that has a water-soluble or rosin flux core in scenarios that require your boards operate at a high reliability rate. At a hobbyist level you should have no issues.FeaturesFlux Type：No-Clean Liquid Flux(for leaded and lead-free applications)Flux Classification：INM0Packaging：10mL PenShelf Life：Refrigerated >24 months； Unrefrigerated >24 months

DescriptionThe Hologram eUICC SIM Card is a mix between legacy and new technology when cellular service is needed your project. This eUICC SIM Card enables profile switching capabilities so you can dynamically change the subscriber profile while your chosen devices are in the field， over-the-air. For those looking for IoT cellular service with no intentions on switching cellular carriers， this SIM card is for you.eUICC features are limited to certain modules at this point. This includes the u-blox SARA-R4 module used on our SparkFun LTE CAT M1/NB-IoT Shield - SARA-R4. For these situations， the functionality will be that of a normal SIM with cellular service through Hologram. You won't be able to change carriers.FeaturesTemperature Range：-25C to 85CNano SIM 8.8mm x 12.3mmMinimum 500，000 Read/write cyclesMinimum 25 yrs at 25℃ Data retention

DescriptionThe Teensy is an amazing and compact development platform in breadboard friendly form factor， but what if you could incorporate it into the Arduino architecture? The Teensy Arduino Shield Adapter allows you to attach your Teensy and utilize your favorite Arduino shields without the requirement of breadboard or any complicated wiring. Needless to say， the Teensy Arduino Shield Adapter is useful tool for upgrading all of your existing Arduino projects to more powerful controller!As we stated before， the Teensy Arduino Shield Adapter provides basic Arduino compatibility with your run-of-the-mill shield but there are few other fun features that we've added on， as well. These features include Real Time Clock(RTC)battery， JST battery connector， 4-12V barrel jack connector， an ICSP header， and more. Because this board is simply an adapter， there is no special programming required to start working with the adapter. You will， however， need to program the Teensy for any Arduino shield you'd like to work with.While the adapter design can fit the Teensy LC footprint， it has been designed to fully utilize the features of the Teensy 3.1. Not all of the features available on the adapter are compatible with the LC so please be sure to check the Hookup Guide in theDocumentssection below to ensure functionality for your project. Please keep in mind that this adapter may be incompatible with some 5V Arduino shields. Please check our hookup guide for more information.Note：The Teensy Arduino Shield Adapter comes as kit and will need to be soldered together.Note：Due to the requirements of shipping the batteries in this kit， orders may take longer to process and therefore do not qualify for same-day shipping. Additionally， these batteries can not be shipped via Ground or Economy methods to Alaska or Hawaii. Sorry for any inconvenience this may cause.FeaturesArduino R3 InterfaceReal Time Clock BatteryJST Battery ConnectorBarrel JackI2C JumpersICSP HeaderDAC Pin Header