Led adjustable speed

12-50V 30A 500W Adjustable Speed Controller DC Brush Motor Speed PWM Controller Adjuster with Control Switch   It's a PWM speed controller so it enables you to control the speed of these little DC brush motors smoothly.  It's ideal for applications like fans, etc. providing nice adjustment of motor speed instead of the more usual "High-Low" switching   Specifications: Operating Voltage: DC 12-50V Rated Current: 30A Control Power: Max. 500W Speed Control Range: 0% -100% PWM Frequency: 21KHz Item Size: 70 * 40 * 30mm Quantity: 1pc   Features: Wide range of operating voltage: 12V 250W, 24V 350W,... 48V 500W A good speed controller for DC brush motors. High-frequency capacitance, power tube and 10A fuse are used in the module. Adopts sealed and high-quality potentiometer with switch, stable performance. Metal case creates better durability; high efficiency and low noise. Suitable for applications like fans, etc. providing nice adjustment of motor speed.   Warning: 1. This speed controller is applicable to DC brush motor, not the DC brushless motor; it can't be used as voltage regulator. 2. It should be connected with DC voltage, don't connect with AC voltage(e.g. 220V AC). 3. It can not use the 48V battery, battery power supply (48V storage electrical voltage of more than 50V.) 4. The anode and the cathode of DC power cannot be connected reversely, otherwise the controller will be damaged. 5. When running direction is inconsistent with your desire, you can change it by adjusting the linear order. 6. Potentiometer switch can change the output duty cycle of controller and then change the motor speed.   Package Includes: 1 *  DC Motor Speed Controller   More Details:  

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Description: The 60LED ring light is designed especially for stereo microscope, and is an excellent companion to various kinds of microscopes and camera. It can offer an optimum amount of lights to the microscope or camera when additional light sources are required or there was not enough light! Inspection and quality control is no longer a problem to view surface defects and overcome the visibility problems related. It can also used as light source for cameras to focus while hunting viewing in dark places or areas.   Features: 60 white LED bulbs for the brightest and most favorable lighting environment. The device is safe to protect the user and the equipment from mild to severe electrostatic electricity. Installing to camera and microscope is very quick and easy to use. Adjustable brightness for flexibility to suit any job and consistent lighting for object illumination. Adjustable screws to keep camera and microscope in place. Provides cool, uniform, flare free and focused shadowfree illumination. Low temperature to maximize the user‘s comfort and operation, even for a long period. Adjustable diameter for the ultimate in attachment flexibility for various tools and equipment. Approved by strict quality and safety standards.   Specification: Color of light: White Crust Material: Plastic part (BLACK COLOR) Input voltage: 100-240V, 50/60Hz Power: 6W Output voltage: 24V Adjustable Brightness Control. Strong and focused illumination with shadow free. LED Ring Light Mounting Diameter: 60mm (max) Shell material: Plastic Lamp shell color: Black Ambient temperature: 32°F to 104°F (0°C to 40°C) Humidity range: 0-80% Atmospheric pressure: 86~105KPa Lamp Life: Minimum 10,000 hours Color temperature: 6400K Illumination: 60 bulbs Cord length: about 1.4m   Package includeds: 1 x 60LEDs Light 1 x US Plug Power Adaptor(Also come with an adapter according to your country~)   Details pictures: