### Description

This project does not have a descriptive photograph.

bipolar chopper drive for small steppers in 0.3 to 1.7A range, using hysteresis current feedback via shunt resistors and comparator, micro-controller and DAC provide step/direction to microstep translation.

### Schematic

### Board

### Bill of Materials

Designator | Value | Description |
---|---|---|

C1 | 33nF | CAPACITOR, European symbol |

C2 | 33nF | CAPACITOR, European symbol |

C3 | 33nF | CAPACITOR, European symbol |

C4 | 33nF | CAPACITOR, European symbol |

C5 | 1uF | CAPACITOR, European symbol |

C6 | 1uF | CAPACITOR, European symbol |

C7 | 1uF | CAPACITOR, European symbol |

C8 | 1uF | CAPACITOR, European symbol |

C9 | 10uF 50V | CAPACITOR, European symbol |

C10 | 10uF 50V | CAPACITOR, European symbol |

C11 | 10uF 50V | CAPACITOR, European symbol |

C12 | 10uF 50V | CAPACITOR, European symbol |

C13 | 100nF | CAPACITOR, European symbol |

C14 | 18pF | CAPACITOR, European symbol |

C15 | 18pF | CAPACITOR, European symbol |

C16 | 100nF | CAPACITOR, European symbol |

C17 | 100nF | CAPACITOR, European symbol |

C18 | 1uF | CAPACITOR, European symbol |

C19 | 100nF | CAPACITOR, European symbol |

C20 | 100nF | CAPACITOR, European symbol |

C21 | 4n7 | CAPACITOR, European symbol |

C22 | 4n7 | CAPACITOR, European symbol |

IC1 | MEGA8-AI | MICROCONTROLLER |

LED1 | LED | |

R1 | 10k | RESISTOR, European symbol |

R2 | 10k | RESISTOR, European symbol |

R3 | 10k | RESISTOR, European symbol |

R4 | 1k | RESISTOR, European symbol |

R5 | 100 | RESISTOR, European symbol |

R6 | 100 | RESISTOR, European symbol |

R7 | 100 | RESISTOR, European symbol |

R8 | 100 | RESISTOR, European symbol |

R9 | 100 | RESISTOR, European symbol |

R10 | 100 | RESISTOR, European symbol |

R11 | 100 | RESISTOR, European symbol |

R12 | 100 | RESISTOR, European symbol |

R13 | 10k | RESISTOR, European symbol |

R14 | 0.1 | RESISTOR, European symbol |

R15 | 0.1 | RESISTOR, European symbol |

R16 | 0.1 | RESISTOR, European symbol |

R17 | 0.1 | RESISTOR, European symbol |

R18 | 1k | RESISTOR, European symbol |

R19 | 2k | RESISTOR, European symbol |

R20 | 2k | RESISTOR, European symbol |

R21 | 2k | RESISTOR, European symbol |

R22 | 2k | RESISTOR, European symbol |

R23 | 2k | RESISTOR, European symbol |

R24 | 100 | RESISTOR, European symbol |

R25 | 56k | RESISTOR, European symbol |

R26 | 56k | RESISTOR, European symbol |

SV1 | step-dir | FEMALE HEADER |

SV3 | prog | PIN HEADER |

SV4 | power in | PIN HEADER |

SV5 | power out | PIN HEADER |

U$1 | SP8K32TB1 | SP8K32TB1 dual n-channel MOSFET |

U$2 | SP8K32TB1 | SP8K32TB1 dual n-channel MOSFET |

U$3 | SP8K32TB1 | SP8K32TB1 dual n-channel MOSFET |

U$4 | SP8K32TB1 | SP8K32TB1 dual n-channel MOSFET |

U$5 | FAN7380 | FAN7380 high-side-low-side MOSFET driver |

U$6 | FAN7380 | FAN7380 high-side-low-side MOSFET driver |

U$7 | FAN7380 | FAN7380 high-side-low-side MOSFET driver |

U$8 | FAN7380 | FAN7380 high-side-low-side MOSFET driver |

U$9 | SS24 | SS24 40V 2A Schottky diode, 50A pulse 1.3W |

U$10 | SS24 | SS24 40V 2A Schottky diode, 50A pulse 1.3W |

U$11 | SS24 | SS24 40V 2A Schottky diode, 50A pulse 1.3W |

U$12 | SS24 | SS24 40V 2A Schottky diode, 50A pulse 1.3W |

U$13 | LM339D | LM339D quad comparator |

U$14 | MCP4902 | |

U$15 | AP1117-REG | |

U$16 | TXC-7A-XTAL | |

U$17 | POLYFUSE-2920 | |

U$18 | CON-4PIN-STEPPER |

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This project is © Mark Tillotson, and is published under the terms of the Creative Commons Attribution-ShareAlike 3.0 Unported licence.