I need a circuit design to trigger two MP3 players.
Each player has 8 trigger pins.
When a pin is momentarily shorted to ground (low) the player
plays the MP3 file associated with that pin.
One section of the circuit will automatically play MP3 files
1 through 8 on PLAYER "A" spaced by an adjustable INTERVAL
TIMER.
The other section of the circuit will play MP3 files 1 through 8
on PLAYER "B" by manually pushing buttons.
Each time an MP3 file is played I need a MASTER RELAY to
hold energized for 30 seconds.
All of my MP3 files will be 30 seconds in length.
I need the circuit design to use simple, basic and common I.C. chips. No micro-
controllers that require programming.
I have over 35 years experience as an electronic design engineer, please see my profile for more details
I believe I could easily design this for you based on the simple 555 timer IC. However the timing tolerance will not be very accurate using this method. In actual fact a micro controller device would be very accurate, very simple circuit and a cheaper solution. However the bid is for the 555 timer solution as you requested
The deliveables would be a circuit as a pdf and a BOM as an excel spread sheet fully costed using distrubuters part numbers
Best Regards
Dave Lelievre
I am a Professional Engineer, I have strong expertise in it I have seen the requirements and understood it Please open chat window and discuss further, so to start and complete the project.
This is not a complex design. That is the reason why I chose it as my first project Freelancer.
Dicrete analogue and logic chips fit very well for this circuit.