![]() I made several L297/L298 stepper motor controllers for my desktop CNC machine and broken link removed. If you want to see what I mean, connect pins 1 and 15 directly to ground and the L298 will burn up. Thread starter blazes16 Start date Status Not open for further replies. ![]() This limits the current to 300mA and means out L298 won't get hotĮnough to burn finger tips. The L298 will constantly be supplying current to the stepper motor unless you add additional sensingĬircuitry, so make sure you don't forget the 10Ω resistors off of pins 1 & 15, the sense pins. The L297 can be used with monolithic bridge drives such as the L298N or L293, or with discrete transistors and darlingtons. Inputs the L297 decides what outputs should be given to the L298 in order to control the stepper motor properly. ![]() The L297 has 4 inputs supplied by the user, a ground, step input (clock), direction and enable. ![]() The LM317 uses a voltage divider 240Ω and 720Ω on its output and adjust pins to create this +5v output. While the motor is powered by a raw +12v input, there is a voltage regulator circuit for +5v going to the The three main elements of the board are (1) the power inputĪnd voltage regulation, (2) the L297 input and outputs and (3) the L298 stepper motor control circuit. The schematic for the board can be seen below.
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