- Sat Jan 07, 2012 4:25 am
#137893
Setup: Arduino Uno, Sparkfun MP3 shield, self made "simple" line out protection PCB.
This setup works like a charm with both headphones and one of those self powered external iphone/ipod portable speakers but its not loud enough and way to "twangy"
Ordered actual speakers: http://www.amazon.com/Yamaha-NS-AW150W- ... 628&sr=8-6
Ordered and assembled the STA540. This time however as soon as power is applied to the amp I get the power light, STBY light, and the Peak light at the same time. switch to "on" and the STBY light goes out like it should but the peak light remains. Disconnected the speaker and the peak light is still on. (both POTs completely counter clockwise during all of this.) I metered all points listed on page 10 of the instruction manual and everything was really close to the figures listed (prior to and since applying power) but I can't find anything else wrong. I'm a hobbyist and not an expert so any info much appreciated. The only other things worth mentioning is that the amp is being powered with a regulated Astro power supply (13.8V at 12.5 amps max) currently dialed to 12.1vdc and I'm currently only trying to use one channel and one speaker output. The peak light is half as bright as the other 2 LED's and I read 10.35vdc at the DIAG test point behind the heat sink. I was unable to read Hz at that point however (thought it might have been PWM causing the dim LED)
In any case I get no output at the speaker at all (whether its on the left or right output with the input switched respectivly) and Im at a loss. I cant see any solder bridges or any defects. Any help much appreciated!
This setup works like a charm with both headphones and one of those self powered external iphone/ipod portable speakers but its not loud enough and way to "twangy"
Ordered actual speakers: http://www.amazon.com/Yamaha-NS-AW150W- ... 628&sr=8-6
Ordered and assembled the STA540. This time however as soon as power is applied to the amp I get the power light, STBY light, and the Peak light at the same time. switch to "on" and the STBY light goes out like it should but the peak light remains. Disconnected the speaker and the peak light is still on. (both POTs completely counter clockwise during all of this.) I metered all points listed on page 10 of the instruction manual and everything was really close to the figures listed (prior to and since applying power) but I can't find anything else wrong. I'm a hobbyist and not an expert so any info much appreciated. The only other things worth mentioning is that the amp is being powered with a regulated Astro power supply (13.8V at 12.5 amps max) currently dialed to 12.1vdc and I'm currently only trying to use one channel and one speaker output. The peak light is half as bright as the other 2 LED's and I read 10.35vdc at the DIAG test point behind the heat sink. I was unable to read Hz at that point however (thought it might have been PWM causing the dim LED)
In any case I get no output at the speaker at all (whether its on the left or right output with the input switched respectivly) and Im at a loss. I cant see any solder bridges or any defects. Any help much appreciated!