Hacker [Dino Segovis] is back again with the fifth installment in his “Hack a Week” series. Now an audio amp inside an Altoids tin isn’t exactly a new concept, but [Dino] takes the time to discuss the circuit in detail, which is great for any beginners out there who are looking for a fun and relatively easy project. It’s another job well done, so be sure to keep reading if you’d like to watch the latest Hack a Week episode in its entirety. Anyone ideas on how to get clean sound out of a circuit with a footprint similar to this one?
How awesome to see this, I just finished my lm386 amp last week and put it into the same flavor altoids. If however you increase the gain by more than 180, the amp will not be able to amplify the whole of the sine wave.
I’d really like to see people move on past the LM386 to a small class D amplifier that could probably do the same from two AA batteries. If so, then one could use a trimpot or a simple voltage divider with two resistors and set it up for maximum volume at low gain without clipping.

Never seen Altoids in the UK (although they are made in Wales?!), anybody got any idea what the UK equivalent is?
Nomad, yes – if you decrease the input signal then it is the same effect as turning down the amp gain, or increasing the amps rail voltages. It would not be the optimal solution though, really you want as much of the original signal present as possible. If you take a look at the data sheet, you will be able to work out what value resistor to put in there to turn the gain down.
PS: Since i have more questions about this, i will start a thread in the forums later today. Well, I don’t know what happened to my comments but I wanted to mention the Ruby guitar amp. You put the polarity on the 220uF but you’re using more electrolytic capacitors doesn’t the others have polarity? After a high-speed video of the assembly process he walks us through the completed amp, then treats us to a couple of short demos.

The output signal from this amplifier can be anywhere from 0V to 9V (or there about, depending on the type of amplifier).
This would result in a clean signal, as the shape of the sine wave input will be the same as that being output. The amplifier will introduce its own electrical noise into the output signal, and by decreasing the input this noise will be more apparent in the output. It turns out that the gain of the amp is determined by the resistor and capacitor values between pins 1 and 8. I was hoping to use this amp to made it loud enough for my purposes but when I pair it with the receiver from the laser communicator it wont work. He’s a big fan of the LM386 amplifier chip because it does so much in such a small package.

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