Critical Velocity Enterprises, LLC - your source for high quality motor controllers.

Our speed controls feature easy to use interfaces ranging from simple analog control using a potentiometer or 0-5V signal to digital push button and logic interfaces for PLC's and microcontrollers.

What is PWM?
Answers to this and more in the FAQ Section!.

Featured Products:
Critical Velocity Accelerometer Shield for Arduino MORE INFO>> $ 19.95	15 Amp PWM Motor Speed Controller MORE INFO>> $ 44.95	9 Amp Bidirectional Motor Controller w/ Braking Forward and Reverse control MORE INFO>> $ 89.95
15 Amp High Frequency PWM Motor Speed Controller MORE INFO>> $ 48.95	AVR ISP, Parallel Port Programmer Kit MORE INFO>> $ 9.95	Critical Velocity Terminal Block Shield Kit, Arduino Compatible MORE INFO>> $ 12.95
AVR Stamp, Arduino and Basic Stamp Compatible MORE INFO>> $ 29.95	Arduino Duemilanove w/ Atmega328, Other Colors MORE INFO>> $ 29.95	Arduino Ethernet Shield MORE INFO>> $ 44.95
Constant Current PWM Resistive Load Controller, 30 Amps MORE INFO>> $ 169.95	28 Amp DIGITAL High Frequency PWM Motor Speed Controller MORE INFO>> $ 59.95	USB to Serial Converter Board MORE INFO>> $ 16.95

Bipolar Stepper Motor Driver with Microstepping capability

The ST-1 Stepper Motor Driver allows you to drive a bipolar or unipolar stepper motor with up to 2.5 Amps per phase of current.

Selectable Full, 1/2, 1/4 and 1/8 step modes provides smooth operation and high resolution.

Opto-isolated STEP and DIRECTION inputs protect your control electronics.

ST-1 Bipolar Stepper Motor Driver