Solid State DC Switching using Mosfet-Arduino nano dc-ssr shield

The simple DC switching possible with this MOSFET board, the board is made in form of Arduino Nano shield, the board can be used to drive inductive load as well as resistive load, possible application for the shield are LED dimmer, DC Motor speed controller, DC load ON/OFF, solenoid driver, and lamp dimmer. D2 provided for back EMF protection which helps to use an inductive load like DC motor or solenoid. The directly seats on top of Arduino Nano, Screw terminal provided to connect the load and Dc supply. This N-Channel MOSFET has been produced using a proprietary PowerTrench® technology to deliver low RDS(on) and optimized BVDSS capability to offer superior performance benefit in the application. FDD8876 MOSFET can drive a high current load, MBRS340 diode protects from back EMF.

Components Details

  • R1 and R2 SMD 5% 0805
  • FDD8876 SMD Mosfet
  • D1 and D2 SMD Mosfets
  • C1, C2 SMD Ceramic 1210 Capacitor
  • CN1,CN2 Screw Terminals 


  • Supply 12V DC
  • Load 4Amps Max
  • PWM Duty Cycle 0 to 100%
  • Arduino Nano D3-PWM Pin-Connected to Mosfet

About MBRS340 Diode

The Schottky Rectifier employs the Schottky Barrier principle in a large area metal-to-silicon power diode. The Schottky Rectifier’s state-of-the-art geometry features epitaxial construction with oxide passivation and metal overlay contact. It is ideally suited for low voltage, high-frequency rectification, or as freewheeling and polarity protection diodes in surface mount applications where compact size and weight are critical to the system.

  • Small Compact Surface Mountable Package with J-Bend Leads
  • Rectangular Package for Automated Handling
  • Highly Stable Oxide Passivated Junction
  • Excellent Ability to Withstand Reverse Avalanche Energy Transients
  • Guarding for Stress Protection

Reduction Assembly for Camera slider, CNC Router, Automation, 3D Printer Using NEMA23 Stepper Motor and timing Pulley

Reduction Assembly  for Camera slider Using Nema 23 Motor and Timing Pulley

Reduction assembly provides 4 times the torque capacity of NEMA 23 motor by using large size pulley and belt. Its features timing pulley on the main out shaft to drive timing belt for linear motion. The unit has been designed to drive professional camera slider however it can be used in various CNC and motion control applications. The unit consists Sanyo Denki high torque NEMA23 motor, 18 teeth HTD timing pulley at motor side and 72 teeth timing pulley at output shaft which provides 1:4 ratio reduction, output has HTD 5MM 20 teeth pulley for slider belt driver.  This unit can be used with rack pinion, use Pinion at output shaft instead of timing pulley.


Reduction Ratio 1:4
Nema 23 Motor
Timing Belt 3MM HTD 15MM Width

Open Ended Timing Belt at Output 15MM width 5MM HTD

Output Timing Pulley 20 Teeth 15MM HTD M5 Pulley

DC Motor Speed Controller with 2 digit display ( Duty Cycle Display)

The versatile DC motor speed controller project is based on PIC16F1825 microcontroller, its generate PWM pulse and also display the value on 2 digit 7 segment display, duty cycle adjustable 0 to 99 %, Frequency 1Khz, the speed of motor possible with help of two tactile switches.  The board only generate and display the PWM, project required Mosfet on output to drive the motor. Check the circuit diagram for the Mosfet circuit.

Note: Output MOSFET can be used as per current and voltage requirements, it is advisable to use isolated DC solid state relay at the output.

Download Hex Code For This Project

Download Data Sheet Of PIC16F1825

Download PDF Schematic


  • Supply 5V DC
  • Motor supply 12V to 30V DC
  • Frequency 1Khz
  • Duty Cycle 0 to 99%
  • Mosfet is outside of the board

3Amps Adjustable Power Supply Provides 1.2V to 15V DC LM1084-ADJ

Simple power supply circuit provides variable output voltage 1.2V to 15V DC and load current up to 3 Amps, onboard trimmer pot provided to adjust the output voltage. Output capacitor C3, C4 provided for transient response, the circuit can take DC input as well as AC input, maximum DC input 15V DC and AC input 12V AC. LM1084-adj IC is heart of the project.

LM1084-ADJ Data Sheet


  • Output 1.2V to 15V DC
  • Input DC 15V DC
  • Input AC 12V AC
  • Load Current Up to 3Amps

Note : The project also can be used with LM1085-ADJ, LM1086-ADJ, AND LM317-ADJ

Note : Higher input and output volatge possible with few changes, input filter capacitor volatge , higher current bridge rectifier can provide higher current up to 5amps with LM1084-adj. refer data sheet of LM1084-ADJ



The LM1084 is a regulator with a maximum dropout of 1.5 V at 5 A of load current. The device has the same pinout as TI’s industry standard LM317.

Two resistors are required to set the output voltage of the adjustable output voltage version of the LM1084. Fixed output voltage versions integrate the adjust resistors.The LM1084 circuit includes a zener trimmed bandgap reference, current limiting, and thermal shutdown.

Refer to LM1085 for the 3A version, and the LM1086 for the 1.5A version.