Electromechanical

US$4.82
This is a massive single pole - double throw (SPDT) sealed relay. 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.
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US$7.87

This smaller solenoid is designed to work directly with 5V which makes it a great match for embedded projects.

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US$3.00

This is a carbon fiber safety cover protects a toggle switch from accidentally being turned on.

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US$6.29

Features: 1.97" square x 0.21" thick (50 x 50 x 5.3mm). 0.4 watt max operation at 8 ohms. Frequency: 500Hz - 8kHz. 10% distortion at 2kHz. Stainless steel diaphragm. Solder type connections.

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US$1.33

This 0.5W, 8Ohm speaker is only 40mm in diameter and just over 4mm thick. If you want to get some sound out of your project but have a tight space budget, this is a good way to do it.

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US$5.53
This encoder is especially cool because it has a common anode RGB LED built in, as well as a push-button.
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US$6.29
This encoder is especially cool because it has a common anode RGB LED built in, as well as a push-button.
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US$2.63
Piezo Speakers are used for making beeps, tones and alerts. This one is petite but loud! Drive it with 3-30V peak-to-peak square wave.
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US$8.33
This is a 28 pin dip 16 channel PWM unit with 12 bit duty cycle control (0 - 4095), 6 bit current limit control (0 - 63), and a daisy chainable serial interface.
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US$7.43
This rotary encoder is the best of the best. It is a high quality 24-pulse encoder, with detents and a nice feel. It is panel mountable for placement in a box, or you can plug it into a breadboard (just cut/bend the two mechanical side tabs.) We also include a nice soft-touch knob with an arrow in it, fits perfectly and looks great.
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US$6.85

This is a 12-step rotary encoder with a nice 'clicking' feel. It's breadboard friendly, and has a pretty handy select switch (by pushing in on the knob). The encoder is different from a potentiometer in that an encoder has full rotation without limits. 

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US$3.95
This small key switch is ideal for projects that require a secure power ON/OFF function. With only 14.5mm diameter front bezel it does not take up much space on your panel. On/Off positions are clearly marked with a green dot for ON and red dot for OFF. Locking action is very positive with a push and rotate requirement to move positions. The switch is perfect for small professional looking projects.
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US$53.13
This 200 pulse per rotation single-output encoder outputs electrical pulses which you can interpret using a microcontroller to find the position of the input shaft. This allows you to add feedback to motor control systems. Encoders of this kind are often used in balancing robots and dead reckoning navigation.
Delivery within 2-3 weeks
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US$2.73

This is a small 12mm round speaker that operates around the audible 2kHz range. You can use these speakers to create simple music or user interfaces.

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US$1.39
This plastic knob accepts a 6mm shaft and has a 15mm outer diameter. They simple press-fit onto a shaft. These are clear so that they can be used with our illuminated potentiometer.
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