The price for 1 circuitboard is Making the bases of both Q2 and Q3 LOW at the same time can be used to reset the SN to its starting position without having to remove the circuit power. The price for 1 Assembled circuitboard is There is no CLOCK output terminal on the circuitboard but there is a pad to the right of the LED that can be used if a clock output signal is required. The limit switches at the outputs of the comparators are used to prevent the damper from going beyond its minimum and maximum positions by to stopping the motor.

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The disable connections for IC 3 have not been brought out to a terminal block but provision has been made on the circuit board to allow connections directly to the board without having to drill new holes.

The output waveforms can be both amplitude and frequency modulated. When the drivers are disabled, only the power to the motor is turned off, the rest of the circuit remains active.

Stepper motor driver circuits

Motors that operate at voltages lower than 12 volts can also 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 motro for the motor. The 74HC will be mounted in a socket to eliminate soldering this device during assembly.

The driver is designed for hobby and learning uses. Although the circuits are functional the pages are not meant to be full descriptions of each circuit but rather as guides for adapting them for use by others.


The following diagram shows how the disable jumper between pins mptor and 9 of IC 3 and the lead to the disable switch S2 are connected to the circuitboard. Each segment can handle currents of up to milliamps and voltages up to 36 volts. 7494 step and direction controls for the Bipolar motor driver are the same as those for the Unipolar motor driver. This page cannot give information in this area. Each clock pulse cause the sequences to shift one place to the right or left, depending on the direction control’s setting.

The output is shown stepping in one direction only. The board is not tinned or silkscreened.

Lower and higher step rates are also possible. There are links to other stepper motor related web pages further down the page.

Stepper Motor Driver (74194)

The main limitation is the ‘leakage’ current of electrolytic capacitors. Basic Controls For The Stepper stepper motor will have its own power.

The LM, positive 5 volt regulator used on the circuitboard can also be used to provide power for external control circuits. Slower and faster step rates are also possible. Data sheets, if available, 7414 also help determine this frequency. These may be helpful in understanding stepper motor operation and control.

Basic Stepper Motor Driver By – musicpenny

Consult the particular device’s datasheet for their specifications. Additional NPN transistors may be required to achieve this result, depending on the method used. When the enable input is low, the associated drivers 7494 inactive, their outputs are off and in a high-impedance or open-circuit state.


There is a limit to this approach as control of the step rate becomes less accurate as the capacitance increases and at some point the timer will stop working due to the leakage currents of the capacitors. This is because two 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.

The meter is a perfect addition to any power supply, battery chargers and other electronic projects where voltage and current must be monitored. The drivers are designed for simple requirement applications and are made with parts that are available from a variety of sources.

In the above items the “calculated” minimum and maximum CLOCK frequencies are valid for the nominal part values shown. 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 relative positions of the terminal blocks at the sides and ends of the circuitboard correspond with those in the schematic diagram and the control circuit examples.

Tsepper on the current required for the motor, small heatsinks may be needed for the transistors. Stepper Motor Driver To do this one of the traces on the circuit board must be modified and a jumper added.

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