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DC/DC Converter - 5V 5W (R-78E)
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Price: $9.90
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Sparkfun Item #: COM-14453 -

This R-78E DC/DC Converter is a switching regulator module that has been designed to offer all the advantages of a switching regulator (high efficiency, wide input range, accurate output voltage regulation) but at an economic cost with the ease of adding it to your project. Due to the R-78E’s high efficiency of up to 91 percent at an output voltage of 5V/1A at the output, no heat sink is required. The compact TO-220 compatible SIP3 package measures only 11.6mm x 8.5mm x 10.4mm, saving precious...

Relay SPDT Sealed
Price: $4.79
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Availability: Stocked
Sparkfun Item #: COM-00100 -

These are high quality Single Pole - Double Throw (SPDT) sealed relays. Use them to switch high voltage, and/or high current devices. This relay's coil is rated up to 12V, with a minimum switching voltage of 5V. The contacts are rated up to 5A (@250VAC, 30VDC). Note: In the Datasheet below there is a pin layout listed as "Bottom View." Be aware, this pin layout is actually the top-down view NOT bottom-up. Features: 5V DC SPDT Relay Rated up to 5A Fully Sealed Documents: Datasheet ...

Relay SPDT Sealed - 10A (G5LE)
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Price: $4.75
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Sparkfun Item #: COM-15207 -

These are high quality, general purpose, Single Pole - Double Throw (SPDT) sealed relays. Use them to switch high voltage, and/or high current devices. This relay’s coil is rated up to 12V. The contacts are rated 10A at 120VAC, 8A at 30VDC (resistive load), and 5A at 120VAC, 4A at 30VDC (inductive lead). Features: 12VDC SPDT Relay Rated up to 10A Fully sealed Documents: Datasheet ...

Relay SPDT Sealed - 10A (G5LE-1 DC3)
Price: $4.75
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Availability: Out of Stock
Sparkfun Item #: COM-16888 -

DC Power Relays interrupt high-capacity DC loads and high-voltage DC circuits in a compact, low-noise design. The switching section and driving section are gas-injected and hermetically sealed, allowing these compact relays to interrupt high-capacity loads. The sealed construction also requires no arc space, saves space, and helps ensure safe applications. These are high quality Single Pole - Double Throw (SPDT) sealed flux protection relays. Use them to switch high voltage, and/or high...

Relay SPDT Sealed - 20A
Price: $5.32
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Availability: Stocked
Sparkfun Item #: COM-10924 -

These are massive single pole - double throw (SPDT) sealed relays. This means that when current is applied to the coil it throws a simple changeover switch, terminating the connection from the NC contact to ground and closing the NO contact. Use them to switch high voltage/high current devices. Features: SPDT Relay Contacts Rated up to 220VAC @ 20A Coil Voltage: 5V Fully Sealed Documents: Datasheet (JQX-15F/005) Relay Tutorial ...

Solid State Relay - 40A (3-32V DC Input)
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Price: $17.51
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Sparkfun Item #: COM-13015 -

A solid state relay (SSR) allows you to control high-curent AC loads from lower voltage DC control circuitry. Solid state relays have several advantages over mechanical relays. One such advantage is that they can be switched by a much lower voltage and at a much lower current than most mechanical relays. Also, because there’s no moving contacts, solid state relays can be switched much faster and for much longer periods without wearing out. This particular SSR can switch current loads of up to...

USB Relay Controller with 6-Channel I/O
Price: $105.48
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Availability: Out of Stock
Sparkfun Item #: DEV-09669 -

This USB Relay Controller / Data Acquisition Module, from Cana Kit, allows computer controlled switching of external devices as well as full bi-directional communication with the external world (ideal for Data Acquisition applications) using the USB port of your computer. The controller is very flexible and can be used in many custom applications including weather stations as well as temperature monitoring, logging and control as it can be easily connected to temperature and other types of...