Sparkfun

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US$4.44
This simple cable has so many uses! Plug the 9 volt battery clip onto a standard 9V battery and connect the other end to anything with a 5.5x2.1mm, center-positive barrel jack.
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US$4.92
Two pin JST connector to a 2.1x 5.5mm barrel jack, 6.25 inch long jumper cable. We use this cable to adapt from a wall power supply to a relatively small, SMD JST connector.
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US$4.92
This is a brass sponge that will help clean your soldering iron tip. Use it to remove residue from your iron tip before soldering. It cleans better than conventional sponges and will not damage your iron tip.
Delivery within 2-3 weeks
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US$6.93
This is an interface cable for the Bus Pirate, designed to connect to its 2x5 I/O header. The cable's connector is composed of two rows of five 0.1" spaced pins; it's also polarized, as is the mating connector on-board the Bus Pirate, so you can only connect the cable in one direction. T
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US$89.95
These crimping pliers allow you to easily make your own wiring harnesses using crimp pins and cable housings. These are not a regular set of crimp pliers. These pliers are capable of crimping very small 1.00 - 1.9mm crimp pins. These work well with JST PH, SH, SHL, and ZH series pins as well as DF14 HRS and micro-latch from Molex.
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US$4.13
This adapter allows you to connect a barrel jack connector to bare wires. One end has screw terminals and the other has a 5.5x2.1mm, center-positive female barrel jack. If you have a power supply with a barrel jack and want to plug it into a breadboard, this might be the simple solution.
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US$1.33
This jack is compatible with 5mm barrel jacks that have a 2.1mm center pole diameter. The outer shell unscrews to reveal solder terminals and a crimp strain relief. The outer shell has strain relief as well.
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US$3.50
Mini Diagonal Cutters. These are great little cutters! A must have for clipping leads and extra solder tails. 4" long.
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US$26.13
These electronic snippers are great for cutting wires and component leads. They have a cushioned handle which makes them much more comfortable to use. These pliers are great if you're looking for something a little better than hobby grade.
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US$26.34
This is a handy tool that everyone should have. It's great for heat-shrink, melting things, and even very basic rework. The size is great for a lot of different applications and it heats up pretty quickly. 300 watts of heating power. 110v operation only.
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US$13.93
When working with small parts, sometimes you need magnification and some extra light. This is a monocle we use regularly in our production facility. It has a 10x lens with a working distance of about 1-1/2".
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US$4.92
Mini Pliers. These are great little pliers! A must have for any hobbyist or electrical engineer. Crucial for inserting devices into bread boards and bending pins. 4" long.
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US$40.50
This smart SMD tester is essentially a pair of multimeter tweezers. This allows you to troubleshoot circuits with small SMD parts without having to fumble with large probes or long wires. Test resistors, capacitors and diodes one-handed!
Delivery within 2-3 weeks
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US$2.73
This is your basic tube of leaded solder with a 63/37 water soluble resin core. 0.031" gauge and 10 grams (around 5ft). Easy to solder with - recommended for beginners.
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US$9.73
This is your basic spool of leaded solder with a 63/37 water soluble resin core. 0.031" gauge and 100 grams. This is a good spool for more advanced users that should last 6-12 months depending on how often you solder. Mix: 63% Sn / 37% Pb.
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US$18.13
This is a very simple fixed temp, quick heating, 30W 110/120 VAC soldering iron. We really enjoy using the more expensive irons, but if you really need a cheap iron for your tool box, this lovely iron is a good choice. This is a low-cost iron and it works! But it doesn't come with a stand.
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US$1.35
Knobs are a great way to finish off your project and make it easier to adjust the level of your death ray. This knob mates to a 0.25" shaft with a set screw.
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US$2.12
Knobs are a great way to finish off your project and make it easier to adjust the level of your death ray. This knob mates to a 0.25" shaft. The knob slides onto the potentiometer and holds tightly with a strong friction fit. The main body of these knobs is metal with a plastic insert. The outside is knurled for precise adjustment.
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US$0.39
This is a very common 0.1uF capacitor. Used on all sorts of applications to decouple ICs from power supplies. 0.1" spaced leads make this a perfect candidate for breadboarding and perf boarding. Rated at 50V.
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Minimum quantity for "COM-08375 Capacitor Ceramic 0.1uF" is 5.

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US$0.39
 This is a very common signal diode - 1N4148. Use this for signals up to 200mA of current.
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US$0.39
This is a simple, very common rectifier diode. Often used for reverse voltage protection, the 1N4001 is a staple for many power, DC to DC step up, and breadboard projects. 1N4001 is rated for up to 1A/50V.
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Minimum quantity for "COM-08589 Diode Rectifier - 1A 50V" is 10.

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US$0.58
Electrolytic decoupling capacitors 1000uF/25V. These capacitors are great transient/surge suppressors and work well in high-voltage and audio applications. High quality radial electrolytic capacitors.
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Minimum quantity for "COM-08982 Electrolytic Decoupling Capacitors - 1000uF/25V" is 5.

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US$0.49
Electrolytic decoupling capacitors 100uF/25V. These capacitors are great transient/surge suppressors. Attach one between the power and ground of your project to ensure smooth power delivery. High quality radial electrolytic capacitors.
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Minimum quantity for "COM-00096 Electrolytic Decoupling Capacitors - 100uF/25V" is 5.

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US$0.63
Low-profile electrolytic decoupling capacitors 10uF/25V. These capacitors are great transient/surge suppressors and work well as charge pump caps for MAX232 circuits. High quality radial electrolytic capacitors.
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Minimum quantity for "COM-00523 Electrolytic Decoupling Capacitors - 10uF/25V" is 5.

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US$1.33
Turn the pot and the resistance changes. Connect VCC to an outer pin, GND to the other, and the center pin will have a voltage that varies from 0 to VCC depending on the rotation of the pot. Hook the center pin to an ADC on a microcontroller and get a variable input from the user!
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US$1.33
Turn the pot and the resistance changes. Connect VCC to an outer pin, GND to the other, and the center pin will have a voltage that varies from 0 to VCC depending on the rotation of the pot. Hook the center pin to an ADC on a microcontroller and get a variable input from the user!
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US$2.12
These panel-mounting rocker switches have built-in indicator lights to let you know when your switch is engaged. They mount into a 20.2mm diameter hole and are rated up to 16A @ 12v.
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US$1.35
Your project will probably need an on/off switch. If you plan to house the project in an enclosure, we found this great rocker switch to help you out. RoHS and UL approved.
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US$4.92
 A simple slide potentiometer can go a long way. Rated at 10kOhm and 0.5W. Comes with solder lug connections. 
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US$3.14
This is the knob that connects to the linear slide potentiometer.  Knob has a nice friction fit onto slide.
Delivery within 2-3 weeks
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US$5.88
These are various leaded cables for attaching to multimeters, power supplies, oscilloscopes, function generators, etc. Cables come in red/black pairs. Dimensions: 36" long.
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US$8.14

These are various leaded cables for attaching to multimeters, power supplies, oscilloscopes, function generators, etc. High quality coax cable with stress relief sleeves. Dimensions: 36" long.

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US$20.93
The BNC probe kit includes a 20MHz professional probe with hook and tip as well as a couple converters to connect the probe to either a BNC jack, RCA jack, or a PCB mount. This kit was designed for use with our Digital Oscilloscope Kit, but there are sure to be a variety of other uses.
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US$7.81
These are various leaded cables for attaching to multimeters, power supplies, oscilloscopes, function generators, etc. Dimensions: 36" Long.
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US$8.33
This is an inexpensive HDMI cable that you can use to hook up your Raspberry Pi to a suitable monitor or TV. Heck, you can hook up anything you want with it, HDMI is becoming more and more common as a digital audio/video standard.
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US$14.66
These are various leaded cables for attaching to multimeters, power supplies, oscilloscopes, function generators, etc. 5 pairs of IC Hook to IC Hook test leads. Comes with Black, Red, Blue, Green, and Yellow colored leads.
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US$6.93
Ribbon cable is really helpful in situations where you need to make a lot of connections without a big mess of wires. Nothing makes a project look more finished than a nice clean wiring harness.
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US$1.35
Ribbon cable is really helpful in situations where you need to make a lot of connections without a big mess of wires. Nothing makes a project look more finished than a nice clean wiring harness.
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US$4.13
Ribbon cable is really helpful in situations where you need to make a lot of connections without a big mess of wires. Nothing makes a project look more finished than a nice clean wiring harness.
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US$1.05
Ribbon cable is really helpful in situations where you need to make a lot of connections without a big mess of wires. Nothing makes a project look more finished than a nice clean wiring harness.
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US$5.53
This is a standard issue USB 2.0 cable. This is the most common A to B Male/Male type peripheral cable, the kind that's usually used for printers. Compatible with most SFE designed USB boards as well as USB Arduino boards like the Uno.
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US$5.41
These extension cables have a type A male connector on one end that plugs into any computer. The opposing end has a female type A connector allowing a second USB cable to be inserted. This allows as many cables to be daisy chained together as needed.
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US$5.53
This is a simple board which holds a 20mm coin cell battery (such as a CR2032) and gives you 4 connection points (two positive and two negative) for sewing into your project.
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US$1.33
Thanks to their square shape, these RGB LEDs can sit flush against a PCB saving you precious vertical space in projects where space is a luxury. They may not be huge, but these common cathode piranha LEDs are bright!
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US$6.23
Metal long standoffs: 1" long x 1/4" OD. Used to get your proto board up off the table. #4-40 thread. Fits most development boards with available holes.
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US$6.36
Metal Hex Male/Female standoffs. #4-40 thread with 3/8" shank and 3/16" thread length. Can be stacked to create any length.
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US$0.70
They are simple angle brackets with one threaded and unthreaded hole. Use them for connecting PCBs at 90 degree angles, mounting accelerometers, gryros, etc. They can also be used on the universal plate set for mounting all sorts of sensors and such.
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US$2.38
Standard Philips-head 4-40 screws. They are 1" long and come in packs of ten. This is the screw size we use in most of the holes for our breakout boards.
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US$0.55

This is a 6-pin 1.5mm pitch connector which mates directly with the connector on the Sharp GP2Y1010AU0F (COM-09689) optical dust sensor.

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US$3.50

A simple slide potentiometer can go a long way. Rated at 10KOhm and 0.1W. Comes with solder lug connections. The pot has an overall travel of 30mm and has two mounting holes on top. Dimensions: 9.5mm x 45mm.

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US$5.88
TRRS connectors are the audio-style connectors that you see on some phones, MP3 players and development boards. TRRS stands for "Tip, Ring, Ring, Sleeve," which reflects the fact that, unlike a standard stereo connector, this actually has three conductors and a ground.
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US$4.92
This is a four inch long USB cable type A to a micro A connection. USB On-The-Go is a really useful USB specification! It allows some small devices that would usually be unable to act as a host to have limited hosting capabilities!
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US$6.93
These are the same jumper wires that come with the SparkFun Inventor's Kit, they're less rugged than the premium jumper wires but they're great for bread-boarding, they're less expensive and we sell them in packs of 30!
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US$16.39
This takes care of the 3.3V regulation, signal conditioning, and basic activity indicators (Power, RSSI and DIN/DOUT activity LEDs). It translates the 5V serial signals to 3.3V so that you can connect a 5V (down to 3.3V) system to any XBee module.
Delivery within 2-3 weeks
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US$22.74
The 7-Segment Serial Display combines a classic 4-digit 7-segment display and an ATMega328 microcontroller allowing you to control every segment individually using only a few serial lines.
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US$48.93
This  is a slim GPS module with -161dBm tracking sensitivity and only 27 second cold start time. The slim design makes it ideal for applications where you don't have a lot of space to work in. Really it's quite small. This 50-channel GPS module has an antenna on board and connects to your system via TTL serial.
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US$2.73
This is a simple 6 ft. long 2.5mm audio cable. It is terminated with a 2.5mm audio plug on one side and unterminated with bare wires on the other end. These are to be used with the ModKit shields.
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US$2.73
TRRS connectors the audio-style connectors that you see on some phones, MP3 players and development boards. TRRS stands for "Tip, Ring, Ring, Sleeve," which reflects the fact that, unlike a standard stereo connector, this actually has three conductors and a ground.
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US$2.73
These Photoluminescent stickers can be cut to size or shape for indicators, decoration or emergency illumination. We were surprised at how brightly these panels glow after being 'charged up' with a bright light source.
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US$7.23
These come in a variety of sizes and this is a pack of 10 small storage cubes that can be individually snapped apart and reattached. Of course they're compatible with all other sizes of modular storage box so you can build custom panels of storage compartments. Outside: 25x30x22mm. Inside: ≈18x17.5x18mm.
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US$7.23
These come in a variety of sizes and this is a pack of 4 medium storage cubes that can be individually snapped apart and reattached. Of course they're compatible with all other sizes of modular storage box so you can build custom panels of storage compartments. Outside: 75x30x22mm. Inside: ≈67x17.5x18mm.
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US$4.10

BNC connectors are ideal for quick connects to audio coax and high-frequency signal lines. This is a right-angle connector and comes with a lock washer and nut.

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US$21.21
The 7-Segment Serial Display combines a classic 4-digit 7-segment display and an ATMega328 microcontroller allowing you to control every segment individually using only a few serial lines.
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US$83.93
The WonderBeeps board is a really simple way of adding wireless capabilities to your next project. Simply connect a standard electret mic, supply 3-5VDC and play the Beeps! The Beeps are transmitted at around 8Khz so they can be heard but they can be embedded within other sounds to make them almost unnoticed.
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