I recently posted some questions about getting a L297/L298 stepper driver circuit working. After remaking our PCBs using photo paper instead of magazine pages the board is finally working. (Video Proof) Thanks for all the help with that. There is one slight problem though. If you watch the video you'll see that when we first power up the circuit the motor just starts spinning due to what I assume is noise on the logic input to the board. I'd like to eliminate that noise, but I'm not sure what the best way of doing this would be.
I'm leaning towards adding a 10K pull-down resistor right by the input. I know normally you'd want to use a capacitor to clean up noise, but we plan on sending input pulses between 30Hz and 3 KHz and I'm not sure what capacitor value to use here. Any suggestions on this? Thanks.
I'm leaning towards adding a 10K pull-down resistor right by the input. I know normally you'd want to use a capacitor to clean up noise, but we plan on sending input pulses between 30Hz and 3 KHz and I'm not sure what capacitor value to use here. Any suggestions on this? Thanks.