To do this one of the traces on the circuit board must be modified and a jumper added. The next diagram shows the modifications that are required for the circuit board followed by the schemtice for the output disable circuit. With isolated supplies, the logic supply stays nice and cool and happy, and you get less noise back form the motors through the power supply. The maximum input voltage is 5 Volts. For this reason be prepared to do some experimenting to get the results you want. For a 12 volt supply, external circuits can draw up to milliamps. I know that you can buy a stepper motor controller IC, but I want to do things the hard way So, now I am trying to control the stepper motor using a TTL shift counter, a hex inverter for direction control and a darlington transistor array.

Uploader: Fenrilrajas
Date Added: 23 December 2012
File Size: 64.18 Mb
Operating Systems: Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X
Downloads: 70883
Price: Free* [*Free Regsitration Required]

For this reason be prepared to do some experimenting to get the results you want. Power for the motors can be regulated or filtered and may range from 12 to srepper volts with currents up to 1, milliamps depending on the particular motor.

Bipolar Stepper Motor Driver (2012)

The outputs of the SNNE are used in pairs that change their polarities on alternate clock pulses. Also avoid carpeted areas during assembly.

The direction of the motor can be controlled by another circuit or the parallel 71494 port of a PC.

Also shown is the cut trace between pins 1 and 16 of IC 3. The following diagram shows how the disable jumper between pins 1 and 9 of IC 3 and the lead to the disable switch S2 are connected to the circuitboard. What do you guys recommend?? The board measures 2 inches by 3. This is because 741994 of the connections between these ICs are crossed on the circuitboard so that the circuitboards output terminals are arranged in an X1 – X2 – Y1 – Y2 order.


Consult the particular device’s datasheet for their specifications. Leave one wire connected permanently and change the other three coil leads as needed.

An external clock with a step rate greater than steps per second can be connected to the driver circuit by removing capacitor C1.

Stepping Motor: Stepper Motor Driver ()

If you are interested in printed circuit boards please send an email to the following address: The relative positions of the terminal blocks at the sides and ends of the circuitboard correspond with those in the schematic diagram ztepper the control circuit examples.

Motors that operate at voltages lower than 12 volts can stepped be used with this driver but a separate supply of of 9 to 12 volts will be needed for the control portion of the circuit in addition to the low voltage supply for the motor. Each clock pulse cause the sequences to shift one stepler to the right or left, depending on the direction control’s setting. Slower and faster step rates are also possible.

For a 12 volt supply, external circuits can draw up to milliamps.

These sheets contain a wealth of data and circuit design information that no electronic or print article could approach and will save time and perhaps damage to the components themselves.

The connections in the following diagram will allow the motor to make single steps.

Stepper Motor Driver (74194)

Additional capacitance can be added to the IC 1 circuit to provide slower motor step rates. You can control lights, fans, AC system, computer, printer, amplifier, robots, garage door, security systems, motor-driven curtains, motorized window blinds, door locks, sprinklers, motorized projection wtepper and anything else you can think of.


If the motor is some distance from the circuit board or power supply, it might be best to separate the motor’s power supply lead from the circuit board’s supply as illustrated in the next diagram. If the circuit board is to be placed in a plastic case, do the assembly work on a wood or metal surface that is steppee to earth.

Bipolar Stepper Motor Driver

Potentiometer “R IN” could be a temperature or light sensing circuit. The use of optoisolators provides complete isolation between the driver and the external control circuit. The board is not tinned or silkscreened. For more information; see the section further down this page. There are links to other stepper motor related web pages further down the page.

This pad is connected to pin 3 of the LM IC. The following picture is of an assembled circuitboard for the Bipolar Stepper Motor Driver. There is no limit on how slow the clock input can be.

If you are interested in a circuitboard and parts for this circuit please send an email to the following address: These stepper drivers have only basic control functions: