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Hackaday.com Design Challenge

 

Questions? Comments email me at

 

 

Scope of Project:

This project is a stereo amplifier the size of a businesses card that can be connected to the headphone jack of any iPod or MP3 Player. The circuit is based on two LM386 power amplifiers two power a set of bookshelf speakers.

 

Skills required:

Component identification

Soldering

 

Downloads:

Gerber Files:

Copper layer Gerber File, this file contains the copper tracks

Cutout layer File, this file contains the border cut out

Isolation Layer, this file contains the route trace around the copper traces

Drill layer Gerber File, this file contains the component holes. Note: there are 12 holes you need to drill out by hand, .0625 inches for the switch and the stereo jacks and .125 inches for the power jack

 

T-Tech ISOPRO file:

Hackaday.ISO , this file contains all layers for this board in T-Tech propitiatory file format in ISOPRO, Just incase some one has a T-Tech milling machine.

 

Traxmaker files by Microcode Engineering

 

Hackaday.PCB, this file contains all layers in Traxmaker file format.

Hackaday.GBL this file contains the copper tracks in Gerber file format. Note: this file does not contain an isolation file. You need to add one with your preferred software.

Hackaday.GDG this file contains the drill holes in Gerber file format

Hackaday.GM1 this file contains the cutout layer in Gerber file format. Note: in this layer the drill holes show up, you need to delete them with your preferred software.

 

Parts List:

Qty

Description

Digikey Number

Radio Shack Number

1

PCB

See files above

See files above

4

4.7 K Ohm resistors

4.7KH-ND

271-1330

1

510 Ohm resistor

510H-ND

271-1317 (470 Ohms)

2

LM386N (5-18 VDC Supply)

LM386N-4-ND

276-1731

2

8 pin IC sockets

ED3108-ND

276-1995

2

1000 uF Electrolytic capacitors

P5169-ND

272-1032

1

.1 uF capacitor

478-3193-ND

272-135

1

22 uF Electrolytic capacitor

604-1062-ND

272-1026

1

Blue LED

L62206CT-ND

276-311

2

3.5mm Stereo Jack

CP1-3513-ND

274-249 *

1

5.5mm x 2.5mm DC Power Jack Switchcraft 760 series

SC1152-ND

274-1582 *

1

SPDT Switch

EG2352-ND

275-613 *

1

Regulated DC power wall wart (12VDC or 9VDC @ 500mA Min)

N/A

273-1667

1

3.5mm to 3.5mm Dubbing Cable

N/A

55020890

1

3.5mm to RCA cable

N/A

55020953

 

* Pin out may vary

Assembly Manual:

 

 

Finished PCB Copper Side

 

 

Finished PCB Component side

 

 

Step 1:

Install R1 4.7K ohm resistor and solder

 

Make sure you bend the lead of the resistor so that I doesn�t fall out when you solder

 

 

Step 2:

Install R2 4.7K ohm resistor and solder

 

Step 3

Install R3 4.7K ohm resistor and solder

 

Step 4

Install R4 4.7K ohm resistor and solder

 

Step 5

Install R5 510 ohm resistor and solder

 

Step 6

Install C1 .1 uF capacitor

 

Step 7

Install IC1 8 Pin Socket, Note: Pin 1 points toward hackaday.com text

 

Step 8

Install IC2 8 Pin Socket, Note: Pin 1 points toward hackaday.com text

 

Step 9

Install Output 3.5 Stereo Jack

 

Step 10

Install Input 3.5 Stereo Jack

 

Step 11

Install 5.5mm DC Power Jack

 

Step 12

Install both 1000 uF capacitors, note Negative lead points toward DC jack

 

Step 13

Install Blue Led, Note: The flat side (cathode) faces towards the 1000 uF capacitors

 

Step 14

Install the 22 uF electrolytic capacitor, Note Negative lead faces the 4.7K ohm Resistors

 

Step 15

Install the SPDT Switch

 

Step 16

Insert the LM386 IC in the Sockets, be sure to line up pin 1. Note the dot in the upper left hand side.

 

Step 17

Hooks up and test, plug in you wall wart and insert it the DC jack the led should light when the switch in the up position

 

Step 18

Test the whole project, hook up your speaker and iPod and test. The output jack is on the top and is labeled on the copper side of your PCB. The input jack is on the bottom and is labeled on the copper side of your PCB.

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