One Watt Audio Amplifier - RevA

by Blueberry.
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2 layer board of 1.50x1.25 inches (38.13x31.78 mm).
Shared on September 15th, 2016 00:54.

Revised One Watt audio amplifier with a Mini USB port and a IS31AP4991A amplifier. C1 thru C3 are 1uF ceramic caps, C4 is a 100uF electrolytic. R1 thru R3 are 4.7k-ohm resistors. R4 and R5 are 47k-ohm for a gain of 10 (20 dB) on the amplifier. As in the previous one-watt amplifier, a stereo signal from the 3.5mm jack is combined into a mono signal using a simple resistor network. The USB input is only used as a 5-volt power source.

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