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

5 Phase Stepper Motor Driver Circuit

The  compact 5 Phase stepper driver project can handle motor up to 3.5amps supply 12-30V DC, driver has facility to set the load current, driver provides half stepping and full stepping, and easy to drive with step and direction pulse, trimmer pot provided to set the current,  The SI-7510 is a pre-driver IC for driving 5-phase stepper motors wound in the New Pentagon configuration (driver circuit design patented by Oriental Motor Co., Ltd.). Direct external control of motor driving functions are synchronized by the built-in sequencer to an applied clock input (CL) signal. The SI-7510 drive is implemented with a user-configurable output stage consisting of dual N-channel power MOSFETs. This results in lower thermal resistance and greater efficiency.

Features and Benefits

• Main supply voltage 12v to 24V DC ( Up to 42V Possible with altering Components Read Data sheet)

• Logic Supply Regulator On Board

• External forward and backward motor rotation control via

CW/CCW input

• External selection of 4-phase (full step) and 4-5–phase

(half step) driving via F/H pin

• Output enable/disable control via Enable pin (internal

sequencer function remains active during Disable state,

monitoring the clock input (CL) for automatic sequencing)

• Built-in charge pump circuit for driving external high-side

N-channel MOSFETs of all output phases

• Self-excitation constant current control set by external R-C

circuit time constant on RC input

RC Signal Monitor Using 20 Bargraph LEDs Including RC Switch ( RC Signal Reader Using Bar-Graph Display)

The versatile Bar-Graph SMD components based R/C signal monitor & R/C switch is a great tool for R/C hobbyist R/C modeller and DIY robotics, Tiny Bar-Graph displays provide a Red color bright, easy to read display of Radio Control (R/C) signal from 1mS to 2mS.  This Bar-Graph has 20 segments in single color and display R/C signal in span of 1mS to 2mS. The Barograph RC Signal reader is based on PIC micro-controller PIC16F886. This high performance measurement provides unique capabilities and can be used in various applications like Radio Signal Monitor, Robotics, Machine Control, RC Remote Tester, RC Signal to ON/OFF switch by connecting Relay board or Solid state relay at output of any suitable LED. Multi switches also possible connecting relay boards on all separate LEDs. Solder Jumpers provided on bottom side of PCB to select particular output to interface with Relay or Solid state Relay. PIC16F886 is heart of the project.

Note: This board has been designed for multiple options and has few extra components. Check BOM carefully before soldering the components.  Solder the parts as described in parts list. 



  • Supply 5V DC
  • Input 1mS to 2 Ms
  • Display Range 1.5mS to 2mS Center to Left 10 LEDs & 5mS to 1mS Center to Right 10Leds
  • Output Display 20 Color RED SMD LEDs
  • Compact Board with SMD Components
  • Supply input Header Connecter
  • Solder Jumper on each LED for Output Control, Alarm, and Relay














1.6KW Brush-Less Motor Power Driver Using IPM STK554U362

The compact motor drive power board is based on STK554U362A IPM module from ON semiconductor. It provides an affordable and easy-to-use solution for driving high power Brushless servo, AC Motors, and DC Brushless motors in a wide range of applications such as power white goods, air conditioning, compressors, power fans, high-end power tools and 3-phase inverters for motor drives in general.

The IPM itself consists of short-circuit rugged IGBTs and a wide range of features like (UVP) under voltage protection, (OCP) Over current protection with fault detection output flag , embedded temperature sensor NTC.Internal Boost diodes are provided for high side gate boost drive.

The main characteristics of this project are its small size, minimal BOM and high efficiency. It consists of an interface circuit, bootstrap capacitors, fault event signal and temperature monitoring. It is designed to work in single or three shunt configuration and with dual current sensing options: using three dedicated on-board op-amps

Thanks to these advanced characteristics, the system can provide the fast and accurate current feedback conditioning necessary for field oriented control (FOC). Refer Data sheet for more information


  • Input voltage: 125 to 400 VAC
  • Nominal power: up to 1600 W
  • Nominal current: up to 10 A
  • Input auxiliary voltage: up to 20 VDC
  • On Board 5V Regulator for Op-Supply
  • D2 Power LED (Gate Driver Supply)
  • 3 Pin Screw Terminal for AC Supply Input
  • 4 Pin Screw Terminal Connector For Motor Connections
  • On Board Fuse for Short Circuit Protection
  • Single- or three- shunt resistors for current sensing
  • IPM temperature monitoring and protection
  • Highly integrated device containing all High Voltage (HV) control from HV-DC to 3-phase outputs in a single small SIP module.
  • Output stage uses IGBT/FRD technology and implements Under Voltage Protection (UVP) and Over Current Protection (OCP) with a Fault Detection output flag. Internal Boost diodes are provided for high side gate boost drive.
  • 3 Independent shunt resistors and 3 X Channel signal condition amplifiers help to easy FOC based driver
  • Header connector provided for inputs and logic supply input
  • Externally accessible embedded thermistor for substrate temperature measurement.
  • Single control power supply due to internal bootstrap circuit for high side pre-driver circuit.
  • Externally accessible embedded thermistor for substrate temperature measurement.
  • All control inputs and status outputs are at low voltage levels directly compatible with micro-controllers.

Note : This board also supports following ICs





















TheSTK554U362A is Intelligent Power Module (IPM) based upon ONs Insulated Metal Substrate Technology (IMST) for 3-phase motor drives which contain the main power circuitry and the supporting control circuitry. The key functions are outlined below:




+, U-, V-, W-

These pins are connected with the main DC power supply. The applied voltage is up to the Vcc level. Overvoltage on these pins could be generated by voltage spikes during switching at the floating inductance of the wiring. To avoid this behavior the wire trac-es need to be as short as possible to reduce the floating inductance. In addition a snubber capacitor needs to be placed as close as possible to these pins to stabilize the voltage and absorb voltage surges.


U, V, W

These terminals are the output pins for connecting the 3-phase motor. They share the same GND potential with each of the high side control power supplies. Therefore they are also used to connect the GND of the bootstrap capacitors. These bootstrap capaci-tors should be placed as close to the module as possible.



These pins connect with the circuitry of the internal protection and pre-drivers for the low-side power elements and also with the control power supply of the logic circuitry. Voltage to input these terminals is monitored by the under voltage protection circuit. The VSS terminal is the reference voltage for the control inputs signals.


VB1, VB2, VB3

The VBx pins are internally connected to the positive supply of the high-side drivers. The supply needs to be floating and electrically isolated. The boot-strap circuit shown in Figure 20 forms this power supply individually for every phase. Due to integrated boot resistor and diode (RB & DB) only an external boot capacitor (CB) is required.

CB is charged when the following two conditions are met. ① Low-side signal is input ② Motor terminal voltage is low level

The capacitor is discharged while the high-side driver is activated.

Thus CB needs to be selected taking the maximum on time of the high side and the switching frequency into account.


The voltages on the high side drivers are individually monitored by the under voltage protection circuit. In case an UVP event is detected on a phase its operation is stopped.

Typically a CB value of less or equal 47uF (±20%) is used. In case the CB value needs to be higher an external resistor (of apx. 20Ω or less) should be used in series with the capacitor to avoid high currents which can cause malfunction of the IPM.



These pins are the control inputs for the power stages. The inputs on HIN1/HIN2/HIN3 control the high-side transistors of U/V/W, and the inputs on LIN1/LIN2/LIN3 control the low-side transistors of U/V/W respectively. The input are active high and the input thresholds VIH and VIL are 5V compatible to allow direct control with a microcontroller system

Simultaneous activation of both low and high side is prevented internally to avoid shoot through at the power stage. However, due to IGBT switching delays the control signals must include a dead-time.



For fail safe operation the control inputs are internally tied to VSS via a 33kΩ (typ) re-sistor. To avoid switching captured by external wiring to influence the module behavior an additional external low-ohmic pull-down resistor with a value of 2.2kΩ-3.3kΩ should be used.

The output might not respond when the width of the input pulse is less than 1μs (both ON and OFF).



The FLTEN pin is an active low input and open-drain output. It is used to indicate an in-ternal fault condition of the module and also can be used to disable the module opera-tion. The I/O structure is shown


The internal sink current IoSD during an active fault is nominal 2mA @ 0.1V. Depending on the interface supply voltage the external pull-up resistor (RP) needs to be selected to set the low voltage below the VIL trip level.

For the commonly used supplies VP:

VP = 15V -> RP >= 20kΩ VP = 5V -> RP>= 6.8kΩ


For a detailed description of the fault operation refer data sheet chapter 4


Note: The Fault signal does not latch permanently. After the protection event ended and the fault clear time(2ms) passed, the module operation is automatically re-started. Therefore the input needs to be driven low externally activated as soon as a fault is detected.



An internal thermistor to sense the substrate temperature is connected between TH and VSS. By connecting an external pull-up resistor to arbitrary voltage, the module temperature can be monitored. Please refer to heading 3.2 for details of the thermis-tor.

Note: This is the only means to monitor the substrate temperature indirectly.



Operation procedure

Step1: Please connect IPM, each power supply, logic parts, and the motor to the evaluation board,

and confirm that each power supply is OFF at this time.

Step2: Please impress the power supply of DC15V.

Step3: Please perform a voltage setup according to specifications, and impress the power supply

between the “+” and the “-” terminal.

Step4: By inputting signal to the logic part, IPM control is started.

(Therefore, please set electric charge to the boot-strap capacitor of upper side to turn on

lower side IGBT before running.)

* When turning off the power supply part and the logic part, please carry out in the reverse order

to above steps.

UC3717 Based Stepper Driver

The UC3717 has been designed to control and drive the current in one winding of bipolar stepper motor. The circuit consists of an LS-TTL-compatible logic input, a current sensor, a mono-stable and an output stage with built-in protection diode.


UC3717 Bipolar Stepper Motor Driver

uc3717-based-stepper-motor-output-driver-3 uc3717-based-stepper-motor-output-driver-1

4 Channel Transistor Based Output Driver For Unipolar Stepper Motor Driver and Relay , Solenoid Driver


Unipolar 4-Phase Stepper Motor Controller Board will help you control a Stepper Motor or 4 individual Solenoids.

This circuit consisting of transistors that serve as current amplifier and also diode to prevent damaging back EMF, circuit uses Darlington transistors to provide high current capacity to unipolar stepper motor. Just provide sequence of pulse using Micro-Controller or desceret circuit to roll out the unipolar motor. On board High Watt resister to control the current, value of the resistor can be set as per your load current requirement.


  •  Box Header (IDC) connector provides for easy interfacing option
  •  Separate LED indicator for individual Phase
  •  Screw terminal connector for easy connection of output load and power supply input
  •  Power-On LED indicator
  •  Four mounting holes of 3.2 mm each
  •  PCB dimensions 86 mm x 49 mm






2.5A Bipolar Stepper Motor Driver with Micro-Stepping Using LV8772 Very Smooth Vibration free Driver

2.5A Bipolar Stepper Motor Driver with Micro-Steppeing Using LV8772 (2)

Tiny Board has been designed around LV8772 IC from On-Semi. This driver is capable of micro-step drive and supports 4W 1-2 phase excitation. It has Low on Resistance with motor current selectable in four steps. The board is equipped with unusual condition warning LED and input Pulse Monitor LED. It is most suitable for the drive of a stepping motor for OA, amusements, hobby CNC, 3D printers, automatic machines, linear guides, motion control systems, XY gantry, Camera focus and zoom controller, Mini camera Pan Tilt Head.



  • Power Supply input 9V to 30V (Max 32V)
  • Output Current 2.5Amps
  • Very low noise and smooth operations
  • Very low noise in slow speed
  • Low on resistance (Total of upper and lower: 0.55ohms)
  • Micro-Step mode can be set to Full-Step, 1/2 Step,1/4,1/16 Steps
  • Motor Current selectable in four steps
  • Output short circuit protection circuit incorporated (IC)
  • Built in thermal shutdown circuit
  • No Control power supply required
  • Input Signals 1. Step (Clock) 2. Direction 3. Enable 4. Reset
  • This Drive default set to enable and reset
  • Current Setting via onboard Preset (Potentiometer)
  • Attenuation ATT1 and ATT2 by Jumpers
  • Two Jumpers for Micro-Step settings
  • On-Board Fault Warning LED
  • On-Board Pulse Input indication LED



  • Slot Machine
  • Vending Machine
  • Cash Machine
  • PPC (Plain Paper Copier)
  • LBP (Laser Beam Printer)
  • Scanner
  • CNC
  • 3D Printers
  • Textile
  • Camera Pan Tilt Head
  • Camera Focus and Zoom Controller

2.5A Bipolar Stepper Motor Driver with Micro-Steppeing Using LV8772 (2)


2.5A Bipolar Stepper Motor Driver with Micro-Steppeing Using LV8772 (1)

2.5A Bipolar Stepper Motor Driver with Micro-Steppeing Using LV8772 (4)

2.5A Bipolar Stepper Motor Driver with Micro-Steppeing Using LV8772 (3)

Chip Enable Functions (Default this pin set to high for normal operation)

  • ST Pin High Operation Mode, Low Disable the drive
  • This IC is switched between standby and operating mode by setting the ST pin, In standby mode, the IC is set to power-save mode and all logic is reset. In addition, the internal regulator circuit and charge pump circuit do not operate in standby mode.


Position detection monitoring function (LED MO, D2)

  • When the excitation position is in the initial position, the Monitor output LED MO D2 placed in the ON State


Setting constant-current control reference current (PR1 Potentiometer)

  • Potentiometer PR1 is to set the Current


RESET Function (Default this pin set to normal operation using pull down resistor R10)


  • Reset Pin Low = Normal Operation, Reset Pin High = Reset State
  • When The RST pin is set to High, the excitation position of the output is forcibly set to the initial state, and the Moni -D2 LED is in ON state, When RST is set to low , the excitation position is advanced by the next STEP input


Output Short Circuit

Output Short-Circuit protection type of IC is latch type to turn off when the output current exceeds the detection current and the state is maintained.  The output short-circuit protection circuit is activated in and event of short-circuit in the output pin. When the short-circuit state continues for a period of time set by the internal timer (approximately 4uS), the output in which short-circuit was first detected are switched to the standby mode, And if the short-circuit state is still detected, all the outputs of the channel are switched to the standby mode, and the state is held, this state is released by setting ST to low.


EMO  Unusual condition warning output pin (Fault LED D1)

This board is provided with EMO (Fault LED) which notifies the CPU of an unusual condition if the protection circuit operates by detecting an unusual condition of the IC, When an unusual condition is detected , the Fault LED D1 is placed in the ON (EMO=Low)


Chopping Frequency

  • F-Chop 10uA/180PF/).5VX2=55Khz


CN1: Power Supply In

CN2: Bipolar Stepper Motor Connections

CN6: Control Signal Inputs ( All inputs are TTL Level)

  • Pin1 5V :  DC Aux ( Output)
  • Pin 2 ENB : Enable ( Default set to Enable , Required low input (Pull Down) to disable)
  • Pin3 CK : Clock input to excite the motor ( Pulse Inputs)
  • Pin 4 : GND Ground Signal
  • Pin5 : RS : Reset input

PR1: Onboard Preset (Potentiometer) to set the Current

D1 : Fault LED

D2 : Pulse Monitor LED

CN5 : Aux. Power Supply Output , Supply 24V, 5V Regulated, Ground

M1, M2 : Jumpers to set the Micro-stepping

A1,A2: To Set the Motor Holding Current  (A1=ATT1, A2=ATT2)




Current Setting Reference Voltage Attenuation Ratio (A1 & A2 Closed= Low, Open=High)

  • ATT1-A1 Low I    ATT2-A2 Low = 100%
  • ATT1-A1 High I    ATT2-A2 Low = 80%
  • ATT1-A1 Low I    ATT2-A2 High = 50%
  • ATT1-A1 High I    ATT2-A2 High = 20%

The formula used to calculate the output current when using the function for attenuating the VREF input voltage is giving bellow

  • I out+(VREF/%)X(Attenuation Ratio)/RF resistance

Example: At VREF of 1.0V, a reference voltage setting of 100% (ATT1-A1=Low ATT2-A2=Low) and an RF resistance of 0.5 Ohms, the output current is set as shown bellow,

  • I-Out=1.0VX5X100%/0.22Ohms=0.91A

If, in this state (ATT1-A1=High, ATT2-A2=High), I-Out will be as follows:

  • I-Out =0.91AX50%=455Ma

In this way, the output current is attenuated when the motor holding current is supplied so that power can be conserved.



3A Tiny Unipolar Stepper Motor Driver Unit Using SLA7078 with Micro-Stepping & Current Adjust


This tiny Unipolar stepper motor driver has been designed around SLA7078MPR IC from Sanken, It is unipolar stepper Motor driver can handle current up to 3 Amps, micro-stepping up to 1/16 steps. On-board Jumpers to set the Micro-stepping, Preset (Potentiometer) to set the current.

The SLA7070MPR series motor driver ICs features unipolar drivers. The clock-in type input interface allows simplified control logic, and options for built-in sense current detection and load circuit short or open protection (patent pending) provide lower loss, and lower thermal resistance.

The built-in excitation distribution circuit (sequencer) allows motor control using only the CLOCK signal for simple operations (rotate/stop), with motor speed control by frequency input into CLOCK pin. This eliminates logic signal lines required for conventional phase-input methods, and reduces demand on heavily-used CPUs.

Unipolar stepper board is high efficient stepper driver for Unipolar stepper motor been design for various application like robotics, control routers, lathes, mills, PCB drillers and engravers.


  • 10 Pin Header connector for signal inputs, Step, Dir., 5V, Sync, V Ref./Sleep
  • Reference Voltage VS Output Current: 0.1V to 0.45V, 0-3Amps
  • Micro-stepping via on board jumper settings
  • Micro-stepping possible : Full Step, Half Step, 1/4th Step, 1/8 Step 1/16 Step
  • Onboard preset for current adjustment
  • Supply input and stepper connection via screw terminal connector
  • Inbuilt fault protections in ic for over temp and short circuit
  • Power supply 12-42 VDC @ 3 A
  • For Normal Operation, V Ref. should be less than 1.5V, Applying a voltage greater than 2.0V ( High level) to VREF pin disables the drive and puts the motor in free state (Coast)








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