Hi Chaps, I am trying to design a noise protection system for use at work. I have already bought a noise level monitor, which has a 5vdc 4.4mA output, from this i have also got a AC remote relay. This in itself would be ok but when the noise level reaches a certain level i want the warning lights which the above powers to stay on for a time period for example 10 minutes, so that the lights are not flashing on and off constantly, due to anomalies in the sound level. I have looked at the timing circuit threads on here but the main question is , how can i incorporate a timing circuit to be powered on a single phase 230Vac supply.
Cheers for any help tom
Cheers for any help tom