Googled "bathroom ventilator switch schematic" in images and found this!
http://www.8085projects.info/image.asp?picture=CD4001%20based%20bathroom%20gating%20lighting%20exhaust%20switch%20circuit..jpg
I have not studied this but it may do what you want
At 12-11-2012, you wrote:
Hello
Diwali Greetings!!!!
I am searching for a power-off delay circuit that works as follows
1. Switch-on activates the equipment and a fan
2. Switch-off switches off the equipment
3. Fan remains on for 2-5 minutes (configurable??)
Used for AC mains (230VAC), switch will be the usual on/off electrical power switch.
Ideas anyone? A tried and tested circuit is preffered.
73
Ravi
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