Mini-amp w/ Bass Boost

1 year ago 796
  • Description
  • Documents
  • BOM
  • Attachments
  • Members
  • Comments

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.

Documents

Sheet_1

Mini-amp w/ Bass Boost

BOM

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

Attachments

Filename Download
2018-08-15T114710.xlsx
Parts List.PNG

Members

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