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| DC Motor 10V - Creates noise in power line |
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| james_s:
What does your circuit layout look like? The motor will draw a significant current, layout is important, especially grounding. |
| schmitt trigger:
I was also thinking about the layout. If the capacitor on pin 5 is referenced to a noisy ground line, noise will actually COUPLE TO the internal divider. Erratic timing is the result. This is not speculation. I have personally seen it happen. |
| 2X:
--- Quote from: schmitt trigger on May 26, 2018, 06:09:55 pm ---I was also thinking about the layout. If the capacitor on pin 5 is referenced to a noisy ground line, noise will actually COUPLE TO the internal divider. Erratic timing is the result. This is not speculation. I have personally seen it happen. --- End quote --- I have this on the breadboard. Will I try to disconnect the capacitor from the pin 5 and leave it on the fly? |
| schmitt trigger:
I would ensure that the motor's return current follows an independent path back to the voltage source's negative from that of the 555 and all its associated components. In other words, single point grounding techniques |
| 2X:
--- Quote from: schmitt trigger on May 28, 2018, 01:41:45 am ---I would ensure that the motor's return current follows an independent path back to the voltage source's negative from that of the 555 and all its associated components. In other words, single point grounding techniques --- End quote --- Single point grounding as I know it needs components which offer isolation like a transformer or an optocoupler or there is an another way (I would like to find a way to eliminate this motor without using an optocoupler)? Thanks a lot for the reply. |
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