Good day, I'm an electronics tech in the military, but I have mainly been doing LRU troubleshooting, and my understanding of circuit designs has not been used since I was trained on it over 7 years ago. Any help would be greatly appreciated.
I'm trying to design a warning system that will activate either a LED or a small buzzer. I need this warning system to activate when there is an absence of current. Here's the basics:
I have an electrical motor that will be powered by 12v here is how it is wired up:
Now what I need is a warning to let me know when the circuit between pins 85 and 87 is broken and there is no current indicating that the pump has gone bad. I was thinking of logic gates, and a 4000B CMOS chip because of the high voltage requirement, 12v. However, I'm not familiar with IC chips too much, I only received training and have no practical experience. I know on the 4000B pins 8 and 9 are a NOT logic gate with 8 being the input and 9 the output. So when I have no voltage on pin 8 I should have a logic high on 9 correct? What should this high consist of? 3V? 5V? would it be enough to run an LED off of, or would I need to use the voltage coming off of pin 9 to activate a transistor? Any help in this matter would be greatly appreciated, as I said it has been years since any training, and even with my training, I have no practical application.
Thanks,
James
I'm trying to design a warning system that will activate either a LED or a small buzzer. I need this warning system to activate when there is an absence of current. Here's the basics:
I have an electrical motor that will be powered by 12v here is how it is wired up:
Now what I need is a warning to let me know when the circuit between pins 85 and 87 is broken and there is no current indicating that the pump has gone bad. I was thinking of logic gates, and a 4000B CMOS chip because of the high voltage requirement, 12v. However, I'm not familiar with IC chips too much, I only received training and have no practical experience. I know on the 4000B pins 8 and 9 are a NOT logic gate with 8 being the input and 9 the output. So when I have no voltage on pin 8 I should have a logic high on 9 correct? What should this high consist of? 3V? 5V? would it be enough to run an LED off of, or would I need to use the voltage coming off of pin 9 to activate a transistor? Any help in this matter would be greatly appreciated, as I said it has been years since any training, and even with my training, I have no practical application.
Thanks,
James