Colvic Watson
Well-known member
Lots of 12v timers out there but I want one to control a coolbox running 15 minutes on, 30 minutes off. Something like this but 12v.
Any ideas?
Any ideas?
What's to stop you from using the 240v one in a 12v system?
....
This quickly gets quite involved, so you can see why the NE555 is still with us, despite most professional designers hating it!
A dual monostable gate 74123????? (IIRC!) might be more elegant, giving direct control of on and off times.
The Maplin timer kit uses a 555 timer chip, and can be easily modified for automatic repeat. You'd probably need to add a relay as well to power a coolbox.
Lots of 12v timers out there but I want one to control a coolbox running 15 minutes on, 30 minutes off. Something like this but 12v.
Any ideas?
The cmos 7555 is a better version.... the duty cycle can be adjusted to vary the coolbox on time from 0 - ie off....
How? Do you mean it stops changing state? Or do you mean it will have a very brief on state?