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Std edition Mini-amp w/ Bass Boost

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License: Public Domain

Published Time: 2021-11-15 10:56:22
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Description

This is a miniature 0.7W amplifier with adjustable bass boost, gain, and volume controls. Uses 1/8" (3.5mm) headphone jacks on the input and output. Powered by USB or 9v (4-12 VDC, max of 15 VDC). I designed it to use film capacitors and Nichicon audio grade electrolytic capacitors wherever possible in order to preserve the signal and reduce noise. An isolated power supply such as a battery is likely the best option for minimal noise but power output will decrease as the voltage drops. The USB port is optional and only there for the convinence of power but it is the minimum voltage in order for the amplifier to function.

Parts list for Digi-Key is attached below in an image and excel file.

design drawing
schematic diagram
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PCB
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ID Name Designator Footprint Quantity
1 PJ-320B AUDIO1,AUDIO2 AUDIO JACK 2
2 0.22u C1,C2,C3,C4 0.047UF/0.22U 5% 100VDC FILM CAP (R82 SERIES)F 4
3 33p C5,C6 0603 2
4 10u C7,C8,C9,C10 CAP-D4.0XF1.5 4
5 0.047u C11,C12 0.047UF/0.22U 5% 100VDC FILM CAP (R82 SERIES)F 2
6 220u C13,C14 CAP-D6.3XF2.5 2
7 100u C15 CAP-D5.0XF2.0 1
8 100 R1,R2,R23,R24 0603 4
9 10k R3,R4,R5,R9,R11,R12,R19,R20 0603 8
10 10k (B) R6,R10 3 PIN OFF-BOARD POT 2
11 2k R7,R8 0603 2
12 22k R13,R14 0603 2
13 10k (A) R15,R16,R17,R18 3 PIN OFF-BOARD POT 4
14 10 R21,R22 0603 2
15 LM386N-3 U1,U2 DIP-8 2

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Project Attachments
Order File name Download times
1

2018-08-15T114710.xlsx

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2

Parts List.PNG

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