Hello.
I have 2 555 timers controlling a stepper motor drive. One is acting as a pusle generator for stepping the motor and the other is in bistable mode toggling the direction (0 to 5V).
The problem is that my bistable 555 sometimes will false trigger. I have put a 220uF cap between the power, and am using a 0.1uF cap on pin 5 to ground. Pin 2 (trigger) is also ac coupled with a 100uF cap. With or without these caps the timer will false trigger. The trigger is controlled by the NO contacts of a relay (not connected to the coil).
Is there a way to add a low-pass filter so that only the contacts closing on the relay will trigger the timer and not - what I am assuming are - short transient dips. Any help would be great thanks!
raptorboy
I have 2 555 timers controlling a stepper motor drive. One is acting as a pusle generator for stepping the motor and the other is in bistable mode toggling the direction (0 to 5V).
The problem is that my bistable 555 sometimes will false trigger. I have put a 220uF cap between the power, and am using a 0.1uF cap on pin 5 to ground. Pin 2 (trigger) is also ac coupled with a 100uF cap. With or without these caps the timer will false trigger. The trigger is controlled by the NO contacts of a relay (not connected to the coil).
Is there a way to add a low-pass filter so that only the contacts closing on the relay will trigger the timer and not - what I am assuming are - short transient dips. Any help would be great thanks!
raptorboy