boxster 987.1 how to get radio on with ignition off

[nogood boyo]

I want the radio on my after market satnav to play for an hour after I turn off the ignition. Anyone know how this can be done?

 

[Chappelle]

I put a 30 second delay into mine. This was to allow me to turn the engine off and not kill the head unit (that links to my phone: the last unit would lose connection if the ignition was off). I would then turn the ignition back on if needed (but not restart the engine)

Used the ignition feed to 'trigger' a circuit. Had planned to use a 555 timer but ended up with a simpler solution with a power transistor.

I also built a light sensitive switch so the Panasonic head unit would dim when it was dark, not when I had lights on

An hour is quite a long time. Why would you want it on for an hour?

 

[nogood boyo]

Thanks for the suggestions. I'm not sure I'm up to your electronic level though! The reasons for an hour include: 1) previously had cars where that was the default 2) sitting by the seaside having a picnic in the car! Any time greater than 20 minutes would do.

 

[michaelfrith]

On both my 997 and 987 I just push the volume control and the radio comes on without the ignition. It does have to be turned off in the same manner.