I built a simple wav player at (http://www.technoblogy.com/show?...). It plays nicely; however, I would like to amplify the digital signal. The article says below.
" There's no amplifier, so the volume depends on the supply voltage, VIN, and the sensitivity of the loudspeaker; generally, larger is better. Note that if you want to feed the output to an audio amplifier you should include a simple low-pass filter; otherwise the 250kHz carrier could damage the amplifier: "
I put in the low pass filter as shown in the image attached, and whipped up an LM386-1 amplifier circuit with VCC as 5V input. The speaker now connected to the LM386's amplified output pin, but all I hear is garbles!
I did the same with the PAM8403 amplifier chip. Still just garbled stuff heard.
Attached also is the LM386 amplifier circuit used.
Thanks for any suggestion/tip/help.