Pocket Protest (a LM386 amp in a 9v battery casing)

Step 2: Amp Circuit

The pocket protest is a basic LM386 reference design with some components forgotten or replaced, it is fairly easy to breadboard out in a few moments

The audio quality is harsh, and in the configuration below you can only get about 2/3's of the volume before the sound is complete garbage, but its surprisingly loud even at low knob levels

If you notice we have to tie 6 points of the circuit to ground, fun right?!

Comments

[art.z]

This idea is awesome!!
I've just built a amp using a LM386, but I couldn't find capacitors and potentiometers that small! So I ended up soldering everything to a perfboard.

Could you explain to me why there is a capacitor to pin 7?
I'm asking because most projects like this don't even ground pin 7..

About the noise, you could put more capacitors to the circuit!
I'm pretty sure you could still fit a ceramic 47kpF between pin 5 and ground!
And you could get rid of the 10uF leaving pins 1 and 8 open! (and use the room to put a 100uF between pin 6 and gorund.
Anyway, it's just an idea..

I'll definetly try this in the future.. I just have to find smaller components!

[rahulhari]

Where is the audio in

[David97]

Vin (pin 3).

[hackman88]

is it Working?

[hackman88]

Is it working good?

[bobmcbob_345]

why do you yse a 220 microfared cap at the end of the amp. it will only act as a high pass filter sou you wil get only treble. i would use somthing like a .22 uf cap

[FRABBAfrabbaFRABBA]

 electrolitics dont act as filter

[darqdean]

All capacitors act as filters since their impedance (ac resistance) is inversely proportional to frequency and capacitance value. The 220uF in the circuit schematic is correct - in conjunction with an 8ohm speaker it will give a low frequency 3dB point of 90Hz where as a 0.22uF would give a low frequency cut-off of 90KHz. (http://en.wikipedia.org/wiki/High-pass_filter)

[osgeld]

90 hz is still pretty tinny, but the brash bullhorn type cutoff helps the sound carry