SparkFun Forums 

Where electronics enthusiasts find answers.

Have questions about a SparkFun product or board? This is the place to be.
By 5_speed_shifter
I have a cheap-o chinese MP3 trigger setup for a couple of years now as an alarm clock and works flawless.

I bought a sparkfun MP3 trigger and I cannot get any audio out of it.

1 - using 5V DC power. Supply is capable up to 1 amp. I soldered to the 3.3-12V pins under the DC jack.
2- the board powers up. I get a solid red LED.
3 - upon powerup, I get 3 flashes from the GREEN LED indicating that the micro card is loaded with a file OK.
4- I loaded the test file from your troubleshooting web page. It only has the 1 test file on it and I can play that file OK on my PC.
5 - The firmware test is OK. With no file it flashes the sequence that it should.
6- I used the default setting of active speaker. I ran the L,R, and gnd (tip, ring, sleeve) to a small 20W amp connected to a speaker. This amp works OK with my phone. No sound from the trigger.
7- when I play the MP3 via the rocker switch, the LED turns green and there is no audio. It will stay green.
8- I changed the solder bridges to "headphone" and I can hear "hiss " in the headphones from the op amp. Still no audio. These are earbuds that test out ok with my phone. (TRS 3.5mm) Again, green LED stays on, no audio.

Any ideas? I exchanged this unit for a previous one that had the same problem. the plastic bag it arrived in is stamped batch # 114817

please advise. I am out of ideas on what is wrong, or what I can try next. The card works OK in the other MP3 trigger I have.

thank you
User avatar
By robertsonics
If the LED turns green, then the MP3 Trigger is playing a file. I suspect something is wrong in your audio output circuit. Have you tried plugging headphones into the audio output jack?
long long title how many chars? lets see 123 ok more? yes 60

We have created lots of YouTube videos just so you can achieve [...]

Another post test yes yes yes or no, maybe ni? :-/

The best flat phpBB theme around. Period. Fine craftmanship and [...]

Do you need a super MOD? Well here it is. chew on this

All you need is right here. Content tag, SEO, listing, Pizza and spaghetti [...]

Lasagna on me this time ok? I got plenty of cash

this should be fantastic. but what about links,images, bbcodes etc etc? [...]