Micro Servo SG90 9G Electronic RC DIY Robot

5V 4-Phase Stepper Step Motor + Driver Board ULN2003 with drive Test Module Machinery Board for Arduino Diameter: 28mm / 1.1in Voltage: DC 5V Length: 274mm / 10.8in Step Angle: 5.625 * 1/64 Reduction ratio: 1/64 DC Resistance: 200±7% (25)

Fixed turn the lamp current to 0.1 times the value of the constant current (charge when used to identify whether the battery is full); 2. Increased input reverse polarity protection diode; 3. Using dedicated reference IC, and high-precision sampling resistor, so that the constant current is more stable, (20 degrees to 100 degrees, the constant current 1A, when the temperature drift of less than 1%).Particularly suitable for LED driver *High-power LED constant current drive *Lithium battery charger (including ferroelectric)