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555 Timer
Price: $1.71
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Sparkfun Item #: COM-09273 -

This is a common 555 timer/oscillator from TI. A classic for all of those first year circuits projects where you need to blink an LED, generate tone, and thousands of other great beginning projects. Google around for a huge list of resources and example projects. Features: 4.5V to 16V supply 8-pin DIP package Timing from microseconds to hours Astable or monostable operation Adjustable duty cycle TTL compatible output Sink or source up to 200mA Documents: Datasheet ...

Analog to Digital Converter - MCP3002
Price: $4.29
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Sparkfun Item #: COM-08636 -

The MCP3002 has a 10-bit analog to digital converter (ADC) with a simple to use SPI interface. Use this IC if your microcontroller does not have an ADC or have enough ADC lines. A great chip when you need to add additional ADC lines. Features: 2.7V to 5.5V supply 10-bit resolution 8-pin DIP package 3 wire SPI interface Up to 75,000 samples per second Low power shutdown Documents: Datasheet ...

Darlington Driver 8-Channel ULN2803 DIP
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Price: $3.44
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Sparkfun Item #: COM-00312 -

8 Darlington Arrays in 18-Pin DIP Package part # ULN2803A. Perfect for running relays and high-power devices up to 500mA and up to 50V! Documents: Datasheet Connecting ULN2803 to Arduino Controlling High Power Circuits with Arduino and ULN2803 ...

Differential Comparator - LM311
Price: $1.59
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Sparkfun Item #: COM-13950 -

The LM311 device is a single high-speed voltage comparator. This device is designed to operate from a wide range of power-supply voltages, including ±15-V supplies for operational amplifiers and 5-V supplies for logic systems. The output levels are compatible with most TTL and MOS circuits. It is capable of driving lamps or relays and switching voltages up to 50 V at 50 mA. All inputs and outputs can be isolated from system ground. The outputs can drive loads referenced to ground, VCC+ or...

Digital Potentiometer - 10K
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Sparkfun Item #: COM-10613 -

Potentiometers are incredibly useful, whether you're controlling the volume on your stereo or the 'mood lighting' in your room. The problem with traditional potentiometers is the fact that your microcontroller doesn't have an easy way to interface with them. Digital Potentiometers solve that problem by allowing you to control a voltage splitter with digital signals. Wire it up just like a potentiometer and use serial signals to 'turn the knob.' Another handy feature of digital potentiometers...

Dual/Quad Power Amplifier - STA540
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Price: $10.59
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Sparkfun Item #: COM-09557 -

The STA540 from STMicro is a 4-channel, class AB audio amplifier designed for high quality sound applications. The four independent channels makes this amplifier a great choice for a number of projects, with needs ranging from four speakers stereo (F/R) to two-speaker bridge solutions. The chip accepts a voltage supply ranging from 8 to 22VDC and has very high output power capability. This chip comes in a staggered-lead Multiwatt-15 package. While our breakout board for the L298N isn't...

Full-Bridge Motor Driver Dual - L298N
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Price: $10.59
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Sparkfun Item #: COM-09479 -

The LN298 is a high voltage, high current, dual full-bridge motor driver designed to accept standard TTL logic levels and drive inductive loads such as relays, solenoids, DC and stepping motors. Comes in a staggered, 15-lead Multiwatt package. Check below for a breakout board. Features: Operating supply voltage of up to 46V 4.5-7VDC logic supply voltage Total DC current of up to 4A Low saturation voltage Over-temperature protection Logical '0' input up to 1.5V (high-noise immunity) Documents:...

Graphic Equalizer Display Filter - MSGEQ7
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Price: $9.27
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Sparkfun Item #: COM-10468 -

The seven band graphic equalizer IC is a CMOS chip that divides the audio spectrum into seven bands. 63Hz, 160Hz, 400Hz, 1kHz, 2.5kHz, 6.25kHz and 16kHz. The seven frequencies are peak detected and multiplexed to the output to provide a DC representation of the amplitude of each band. No external components are needed to select the filter responses. Only an off chip resistor and capacitor are needed to select the on chip clock oscillator frequency. The filter center frequencies track this...

H-Bridge Motor Driver 1A
Price: $4.24
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Sparkfun Item #: COM-00315 -

Faster, cheaper, smaller, better, right? The SN754410 Quad Half H-Bridge is just that. Capable of driving high voltage motors using TTL 5V logic levels, the SN754410 can drive 4.5V up to 36V at 1A continuous output current! Please see datasheet for more information. This is a pin to pin compatible replacement for the L293D. **Datasheets: **SN754410

High Speed Optoisolator - 6N137
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Price: $1.99
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Sparkfun Item #: COM-15105 -

This diode-transistor photocouplers consist of an LED, optically coupled to a high speed photodetector to transmit electrical signals between circuits while still isolating your system from higher voltages. The 6N137 optoisolator is presented in an 8-pin DIP package. The output features is an open collector and coupler parameters are guaranteed over the temperature range from -40℃~5℃. The internal shield provides a guaranteed Common Mode Transient Immunity (typical) 10KV/μs. Features: High...

I/O Expander - MCP23008
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Price: $3.97
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Sparkfun Item #: COM-15099 -

Add another eight pins to your microcontroller using a MCP23008 port expander. The MCP23008 uses two I2C pins which can be shared with other I2C devices, and in exchange gives you eight general purpose pins. You can set each of eight pins to be input, output, or input with a pullup. There's even the ability to get an interrupt via an external pin when any of the inputs change so you don't have to keep polling the chip. Use this chip from 2.7-5.5V (good for any 3.3V or 5V setup), and you can...

I2C EEPROM - 256k Bit (24LC256)
Price: $3.97
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Sparkfun Item #: COM-00525 -

This is an I2C, 256Kbit, Serial Electrically Erasable PROM (EEPROM), capable of operation across a 2.5V to 5.5V range. It has been developed for advanced, low-power applications such as personal communications or data acquisition. This PTH IC also has a page write capability of up to 64 bytes of data and is capable of both random and sequential reads up to the 256K boundary. Its functional address lines allow up to eight devices on the same bus, for up to 2Mbit address space. These 8-pin chips...

LED Display Driver (8-Digit) - MAX7219CNG
Price: $17.57
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Sparkfun Item #: COM-09622 -

The MAX7219CNG is a compact, serial input/output common-cathode display driver that can interface microprocessors to 7-segment numeric LED displays of up to 8 digits, bar-graph displays, or 64 individual LEDs. Included on-chip are a BCD code-B decoder, multiplex scan circuitry, segment and digit drivers, and an 8x8 static RAM that stores each digit. Communication with the MAX7219 is achieved through a convenient 4-wire serial interface (supports SPI). Individual digits may be addressed and...

N-Channel MOSFET 60V 30A
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Price: $1.99
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Sparkfun Item #: COM-10213 -

If you've ever wondered how to control the headlight of a car from a microcontroller, a MOSFET is what you need. This is a very common MOSFET with very low on-resistance and a control voltage (aka gate voltage) that is compatible with any 3-5V microcontroller or mechanical switch. This allows you to control high-power devices with very low-power control mechanisms. **Note: **We stock two different models of this component, the two are nearly identical and can be used interchangeably. We've...

Op-Amp - AS358P (Through-Hole)
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Price: $1.77
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Sparkfun Item #: COM-15946 -

The AS358P is a great, easy-to-use dual-channel Op-amp. Op-amps have so many applications we figured we should probably carry at least one in a DIP package. AS358P applications include transducer amplifiers, DC gain blocks and all the conventional op-amp circuits. If you're looking for a good, standard op-amp the AS358P should fill most of your needs. It can handle a supply of 3-36VDC and source up to 20mA per channel. This op-amp is great if you need to operate two individual op-amps from a...

P-Channel MOSFET 20V 24A - low Vgs(th)
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Price: $3.97
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Sparkfun Item #: COM-12901 -

If you’ve ever wondered how to control high current devices from a low-power microcontroller, a MOSFET is what you need. The NDP6020P is a very common MOSFET with very low on-resistance and a control voltage (aka gate voltage) that is compatible with most 5V and 3.3v microcontroller or mechanical switches. This allows you to control high-power devices with very low-power control mechanisms. Documents: [Datasheet](https://cdn.sparkfun.com/datasheets/Components/General IC/NDP6020P.pdf) ...

P-Channel MOSFET 60V 27A
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Price: $1.99
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Sparkfun Item #: COM-10349 -

If you've ever wondered how to control the headlight of a car from a microcontroller, a MOSFET is what you need. The FQP27P06 is a very common MOSFET with very low on-resistance and a control voltage (aka gate voltage) that is compatible with most 5V microcontroller or mechanical switches. This allows you to control high-power devices with very low-power control mechanisms. Documents: Datasheet ...

Schmitt Trigger - CD40106B
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Price: $1.59
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Sparkfun Item #: COM-13952 -

The CD40106BE consists of six Schmitt-trigger circuits. Each circuit functions as an inverter with Schmitt-trigger action on the input. The trigger switches at different points for positive- and negative-going signals. The difference between the positive-going voltage (VP) and the negative-going voltage (VN) is defined as hysteresis voltage (VH). Features: Schmitt trigger action with no external components Hysteresis voltage typ. at 0.9V at VDD = 5V, 2.3V at VDD = 10V, and 3.5V at VDD =...

Shift Register 8-Bit - SN74HC595
Price: $1.71
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Sparkfun Item #: COM-13699 -

The SN74HC595N is a simple 8-bit shift register IC. Simply put, this shift register is a device that allows additional inputs or outputs to be added to a microcontroller by converting data between parallel and serial formats. Your chosen microprocessor is able to communicate with the The SN74HC595N using serial information then gathers or outputs information in a parallel (multi-pin) format. Essentially it takes 8 bits from the serial input and then outputs them to 8 pins. This small DIP...

Shift Register 8-Bit High-Power - TPIC6B595
Price: $3.97
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Sparkfun Item #: COM-00734 -

Simple shift register IC that can control high-voltage/high-current devices directly! Clock in data and latch it to control devices like relays, motors, high-current optical devices, and more! Each channel can sink 150mA continuous, 500mA max. Get started with the Shift Register Guide Documents: Datasheet Videos ...

SpeakJet
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Price: $48.20
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Sparkfun Item #: COM-09578 -

The SpeakJet is a completely self-contained, single-chip voice and complex sound synthesizer. It uses a mathematical sound algorithm to control an internal five channel sound synthesizer to generate on-the-fly, unlimited vocabulary speech synthesis and complex sounds. The SpeakJet is pre-configured with 72 speech elements (allophones), 43 sound effects, and 12 DTMF Touch Tones. Through the selection of these sounds, and in combination with the control of the pitch, rate, bend, and volume...

Voltage Regulator - 12V
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Price: $2.65
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Sparkfun Item #: COM-12766 -

This is the basic L7812 voltage regulator, a three-terminal positive regulator with a 12V fixed output voltage. This fixed regulator provides a local regulation, internal current limiting, thermal shut-down control, and safe area protection for your project. Each one of these voltage regulators can output a max current of 1.5A. Features: Output Voltage: 12V Output Current: 1.5A Thermal Overload Protection Short Circuit Protection Output Transition SOA Protection Documents: Datasheet Fixed...

Voltage Regulator - 3.3V
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Price: $3.44
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Sparkfun Item #: COM-00526 -

This is the basic LD1117V33 voltage regulator, a low drop positive regulator with a 3.3V fixed output voltage. This fixed regulator provides a great amount of stability and protection for your project and with its on chip trimming this regulator is able to reach an output voltage tolerance within ±1%. Each one of these voltage regulators can output a max current of 800mA. Features: Output Voltage: 3.3V Output Current: 800mA Dropout Voltage: 1V Internal Current and Thermal Limit Documents:...

Voltage Regulator - 5V
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Sparkfun Item #: COM-00107 -

This is the basic L7805 voltage regulator, a three-terminal positive regulator with a 5V fixed output voltage. This fixed regulator provides a local regulation, internal current limiting, thermal shut-down control, and safe area protection for your project. Each one of these voltage regulators can output a max current of 1.5A. Features: Output Voltage: 5V Output Current: 1.5A Thermal Overload Protection Short Circuit Protection Output Transition SOA Protection Documents: Datasheet Fixed Power...

Voltage Regulator - Adjustable
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Sparkfun Item #: COM-00527 -

This is the LM317TG voltage regulator, a three-terminal positive regulator with a 1.2V to 37V adjustable output voltage. This adjustable regulator provides a local regulation, internal current limiting, thermal shut-down control, and safe area protection for your project. Did we mention that this guy is easy to use? It only requires two external resistors to set the output voltage. Each one of these voltage regulators can output a max current of 1.5A. Features: Output Voltage: 1.2V - 37V...