I like that thread title. It's catchy.

I have a digital timer/relay that will turn on a 12-13.5 volt dc power supply
which will drive; 1). a T-amp, 2). a small motor 3). an mp3 player (via a
voltage divider).

I need a circuit which, when supplied with voltage via the timer, will trigger a small reed relay with a succession of controlled pulses...
(ON for 2 seconds, OFF for 2 seconds, ON for 2 seconds, OFF for 2 seconds,
etc. and then STOP RETRIGGERING). This circuit will turn on the MP3
player. I can't figure out how to make the retriggering on the 555 to stop
as I'm a bit of a hack. Is it possible to use the audio signal output of the
MP3 player to interrupt the 555 pulsing?

Let me know if this will be possible or will I need to get into programmable chips and such? I may just go the route of portable CD
player as they have simpler triggering sequences to start (e.g. press play).

Thanks so much.

 

Hello,

If you know how many times it should go on and off, you could make a counter that will stop the sequence.
The idea is a start / stop flip / flop.
You start the sequence , count and stop the sequence.

Greetings,
Bertus

 

Yes you can amplify and detect the MP3 audio signal to stop the 555. Also, you can use another 555 which will make a certain delay time and then inhibit the the other timer by changing the signal on pin 4 from high to low.