Raspigamer
Posts: 53
Joined: Thu Nov 05, 2015 3:48 am

Amplifier Issues

Mon Sep 05, 2016 5:17 pm

I have the MAX98306 amplifier (https://www.adafruit.com/products/987) and I have it hooked up like this
VDD to 5v power source
Gnd to Gnd
L+ to L connector of pigtail (https://www.adafruit.com/products/1700)
R- and L- connected to Gnd of Pigtail
R+ to R connector or pigtail
LOUT + and - to Left Speaker (https://www.adafruit.com/products/1890)
ROUT + and - to Right Speaker (https://www.adafruit.com/products/1890)

So I have tested the speakers and they work perfect and the Cable has been tested also and work just as well.
The amps VDD connector doesn't seem to supply power to the rest of the amp when we tested it with the multimeter. When we tested it, the power would spike then slowly lose all power. I have no idea what is wrong. I can't tell if it needs a different power supply or if it is a faulty amp and just need to buy a new one (when we tested it the amp began to get very, very hot)

If anyone can help me with this problem it would be greatly apreciated

IanS
Posts: 236
Joined: Wed Jun 20, 2012 2:51 pm
Location: Southampton, England

Re: Amplifier Issues

Tue Sep 06, 2016 12:51 pm

You have tested some components successfully, so it must come down to what is left: the power supply or the amp.
The amp is capable of 2x 3.7W output, so nearly 8W total, and allowing for losses that probably needs 10W input power. 10W / 5V = 2A. Are you using a PSU that is capable of 2 amps output? Some little phone-charger style ones are not this powerful.
If the PSU should be OK, then try a new amp. They are not very expensive, and equivalents can be found even cheaper on eBay.
One word of warning: you have connected it up correctly according to your wiring description, but never take a shortcut and use the same connection for the R- and L- outputs as a common link to both speakers. Do not try to connect it to headphones either, as this will normally do the same. This can destroy a class D amp.

Raspigamer
Posts: 53
Joined: Thu Nov 05, 2015 3:48 am

Re: Amplifier Issues

Thu Sep 08, 2016 8:04 pm

IanS wrote:You have tested some components successfully, so it must come down to what is left: the power supply or the amp.
The amp is capable of 2x 3.7W output, so nearly 8W total, and allowing for losses that probably needs 10W input power. 10W / 5V = 2A. Are you using a PSU that is capable of 2 amps output? Some little phone-charger style ones are not this powerful.
If the PSU should be OK, then try a new amp. They are not very expensive, and equivalents can be found even cheaper on eBay.
One word of warning: you have connected it up correctly according to your wiring description, but never take a shortcut and use the same connection for the R- and L- outputs as a common link to both speakers. Do not try to connect it to headphones either, as this will normally do the same. This can destroy a class D amp.
Okay thank you I believe it is just an issue of the PSU

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