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

Balanced Audio Line Driver (Unbalance to Balance Audio Signal Converter) Using DRV135/SSM2142

The Mini board converts unbalance Audio signal into balance audio signal, project is based on SSM2142 or DRV135 IC which are differential output amplifier that converts a single ended audio signal input to a balanced output pair. This balanced audio driver consists of high performance op-amps with on-chip precision resistors. They are fully specified for high performance audio applications and have excellent ac specifications, including low distortion (0.0005% at 1 kHz) and high slew rate (15 V/µs).

The on-chip resistors are laser-trimmed for accurate gain and optimum output common-mode rejection. Wide output voltage swing and high output drive capability allow use in a wide variety of demanding applications. They easily drive the large capacitive loads associated with long audio cables. Used in combination with the INA134 or INA137 differential receivers, they offer a complete solution for transmitting analog audio signals without degradation.

Note : SSM2142 and DRV135 pin to pin compatible, any of this IC can be used.


  • Supply Dual 15V DC (+/-15V DC)
  • Balanced Output
  • Low Distortion: 0.0005% at f = 1 kHz
  • Wide Output Swing: 17Vrms into 600 Ω
  • High Capacitive Load Drive
  • High Slew Rate: 15 V/µs
  • Low Quiescent Current: ±5.2 mA
  • Companion to Audio Differential Line Receivers
  • Header Connector Provided for Audio Signal Input
  • Header Connector for Supply Input
  • Audio Output from XLR Connector
  • On Board Power LED


  • Audio Differential Line Drivers
  • Audio Mix Consoles
  • Distribution Amplifiers
  • Graphic Equalizers
  • Dynamic Range Processors
  • Digital Effects Processors
  • Hi-Fi Audio Equipment’s



  1. Capcitor C5,C10 Non Polar Capacitors
  2. All Resistors SMD 0805 5%
  3. LED SMD 0805
  4. C1,C3,C7 Electrolytic Capacitors SMD
  5. Output XLR Male Connector

Design Requirement

Consider a design with the goal of deferentially transmitting a single ended signal of up to 22.2 dBu through 500 ft of cable with no load at the receiving side. The signal at the end of the cable should have no more than 0.002 percent of total harmonic distortion plus noise (THD+N) at 10 kHz and less than 0.0005 percent of THD+N for frequencies between 20 Hz and 1 kHz.

The system is required to put out a single ended signal 0 dB with respect to the input signal and accommodate inputs with peak to RMS ratios of up to 1.5 for the maximum 22.2 dBu range established above.

The DRV134 and DRV135 were designed for enhanced ac performance. Very low distortion, low noise, and wide bandwidth provide superior performance in high quality audio applications. Laser-trimmed matched resistors provide optimum output common-mode rejection (typically 68dB), especially when compared to circuits implemented with op amps and discrete precision resistors. In addition, high slew rate (15 V/μs) and fast settling time (2.5 μs to 0.01%) ensure excellent dynamic response. The DRV134 and DRV135 have excellent distortion characteristics. As shown in the distortion data provided in

the Typical Characteristics section, THD+Noise is below 0.003% throughout the audio frequency range under various output conditions. Both differential and single-ended modes of operation are shown. In addition, the optional 10μF blocking capacitors used to minimize VOCM errors have virtually no effect on performance. Measurements were taken with an Audio Precision System One (with the internal 80 kHz noise filter

Example Circuit With Balanced Line Receiver