Electronic sleep timer for my car stereo
I have a Sony CDX-GT470US carstereo and Sony RM-X4S wired remote for it.
here is a schematic for the remote www.panuworld.net/minidisc/fordsony/rm-x2s.gif
It has also a wireless remote so when I am in bed I can turn it off with it unless I have fallen asleep.
Sometimes I wake up in the middle of the night with the radio still on. This wastes power and might flatten the battery.
So I need some device which attaches into the wired remote parallel to the off switch. Then some type of timer circuit which gives a 2 second pulse to short the contacts to turn off the stereo.
Any ideas appreciated.