You can use the schematic I provided for an adjustable output. This is probably a real dumb question, but how do you use perfboard?? I am also not sure about the Sync ,Home and Reset pins? I have been investigating stepper motor control for the last couple of months. What is the current limit you have set for each coil? Output of the on-chip chopper oscillator. Also, I have not yet tried any circuits!!

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Daniel Massimo is in milanthe capital of design I subscribe to everything you wrote in the post.

P297 about ten years old, and still works like a charm. Vref is set by a voltage divider to a voltage equal to the peak current multiplied by the value of the current sense resistor s. Allegro have some new ICs out for controlling unipolar steppers that do the job of the L and the darlington ardiuno in one chip.

If you don’t want the chopper drive A failure of the L often results in a failure of the L and could be why it is getting hot. I’m glad to hear that this one worked well for you! You can add as much as you want. How can I do l97 with the ULN for two axis driver?


It looks like a marvelous egyptian hieroglyphic. I am trying to build my own stepper drivers for my 3 axis CNC plotter a cnc with pen instead of a tool.

L298 & L297 Based High Current Bipolar Stepper Motor Driver

Please post if you already have a good solution for one of these circuits. Dear Dizzy Unfortunately for you, this place is full l927 professors like me It hasn’t heatsink grease or mica I think it’s bad.

So I am having trouble with a circuit I am building for a stepper motor controller, I am currently ardukno this schematic My problem is that I don’t really know what the Vref, control, sync and home pins do in this cirucit and what they connect to, and because of this I haven’t connected anything to them when testing my circuit. First, here is what I have arduion about this chip that might be useful for others interested in stepper control Sign up using Email and Password.

Motor specs are here.

I would also appreciate advises that would be help me complete this project successfully. I would like to compile circuit designs using the l to control bipolar and unipolar steppers, with and without chopper control.

Swift Focus: Arduino stepper motor control with L and ULNA – video dailymotion

Aeduino stepper motor controller. These large current draws make the supply voltage drop, unless your power supply can handle it.


I think Massimo is in Sweden and I am in Canada, near the pacific, so here is part two of your international answer! You are using perf board, right??

arduino – L + L circuit not working – Electrical Engineering Stack Exchange

TomGeorge Design and Repair of industrial control systems. I’m not sure if you would need a buffer. L stepper driver guidance for CNC plotter project.

If you find any of the answers here or in any of the other questions you have asked useful, you might consider up-voting them. When a stepper motor turns on, it draws large amounts of current into its windings. If i remember correctly, when arduino is powered by an external supply ie not USBthe 9V pin actually outputs the same voltage as the supply voltage. Forget the “IC Bridge” diodes Spehro Pefhany k 4 I contacted my local sales rep and got aeduino free samples.

I put the whole circuit in a Hammond B arduink, and the box acts as a heatsink. I have found so many different diodes.