Attached is a photo of a class D audio amp I just received. Here are the advertised specs.
Description:
Work: D Class
Quiescent Current: 20mA
Efficiency: 90%
Rated output power: 10W +10 W (8Ω)
Frequency response: 20Hz to 50KHz
Operating voltage: DC7.5-15V
Recommended supply voltage: 12V, the center PIN of 12VDC is +.
PCB board size: (40 * 40) mm
I have tried it and it sounds really good to my untrained (and abused) ears. Using a 9V power source (6AA cells) and two 4-inch, 8Ω, 10W (Pioneer) speakers, it draws only ≈25mA at a comfortable listening level. Wide open, it is uncomfortably loud. I paid $6.98 including shipping.
This seems like a mixed blessing. I like the amp, but the good performance and low price discourage me from trying to build one. In addition, the relatively high number of SMD parts is a further deterrent to my initiative.
Description:
Work: D Class
Quiescent Current: 20mA
Efficiency: 90%
Rated output power: 10W +10 W (8Ω)
Frequency response: 20Hz to 50KHz
Operating voltage: DC7.5-15V
Recommended supply voltage: 12V, the center PIN of 12VDC is +.
PCB board size: (40 * 40) mm
I have tried it and it sounds really good to my untrained (and abused) ears. Using a 9V power source (6AA cells) and two 4-inch, 8Ω, 10W (Pioneer) speakers, it draws only ≈25mA at a comfortable listening level. Wide open, it is uncomfortably loud. I paid $6.98 including shipping.
This seems like a mixed blessing. I like the amp, but the good performance and low price discourage me from trying to build one. In addition, the relatively high number of SMD parts is a further deterrent to my initiative.
Attachments
-
92.4 KB Views: 129
-
294.3 KB Views: 126