Introduction: Surround Sound From 3.5 Mm Stereo

This Instructable describes how I built a surround sound system for use with a 3.5 mm stereo output. The goal is to extend surround sound experience from any 3.5 mm stereo headphone output with quality and simplicity. Works great with PCs, MP3 players, CD players, tape recorders etc. This is a low power (around 1 Watt) version of the ABC surround sound decoder.

You will need the following items to build 3.5 mm surround sound:
- Parts shown on attached schematic.
- Plugboard.
- 4 heatsinks (1.5" x 2" copper or aluminum sheet metal).
- 4 speakers (4 - 8 Ohm, about 3 Watt nominal power). Almost any type of speaker works:
Computer speakers, satellite speakers, small speakers, big speakers, etc.
- Wire.
- 4 phillips 6-32X1/4 nylon machine screws.
- 4 nylon 6-32 hex nuts.
- Heatsink grease.
- 12V, 500mA or more power supply.
- 3.5 mm plug to 3.5 mm plug cable.

Drill, solder gun and soldering accessories, cutters, tweezers, wirestripper.

Step 1: Making the Circuit

The circuit I used consists of a power amplifier with 3.5 mm jack input and the surround sound decoder. 3.5 mm input jack can be replaced by cable with 3.5 mm plug if desired.

Mark future hole center by placing T3 transistor at lower left corner of the heatsink. Drill hole in each heatsink.

Assemble circuit shown on schematic. This step requires some assembling and testing skills.

Apply a small amount of heatsink grease on T3, T4, T7, T8 transistors and secure heatsink on each of them using screw and nut. Warning: heatsinks should not touch each other!

Step 2: Speaker Preparation

I used pair of low power Phillips speakers available at Walgreens and pair of old PC speakers.

Attach wires to each speaker paying attention on polarity.

Step 3: Final Connection

Any 12V, 500mA power supply is sutable for this application.

Connect power supply and speakers to circuitry - system is ready.

Comments

author
jaxboy made it! (author)2012-08-12

You can add a center channel simply by running a wire from the + terminal of the 2 stereo speakers to the terminals of the center channel speaker. It results in only a slight reduction of volume, but true center channel output.

author
DustySeven7 made it! (author)2012-05-04

This is not really surround sound. Surround sound is 4 distinctive and different channels. This is surround stereo. Stereo sound that is duplicated to front and side channels

author
i-blaze made it! (author)2012-03-16

will dis work with 5.1 headphones

author
Rahul16 made it! (author)2010-12-26

Can u provide detailed component list used in making the amplifier and decoder. you have used to one more socket, for connecting speakers. can u tell in detail how u connected the other speaker with out socket(soldered wire). because i too have same type speakers one set with jack and another without jack.

author
wobbler made it! (author)2010-06-25

This looks like it a slightly more complicated version of the Hafler circuit: http://members.tripod.com/martin_leese/Audio/HaflerCircuit.txt The Hafler system can easily be added to a two speaker system with its own amp using a pair of old speakers. leaving out the front centre speaker. I'd be interested in comparing the two eventually. You can see it here in another post too: https://www.instructables.com/id/Surround-sound-for-free-it-could-save-your-marria/ Keep on truckin'!

author
HADJISTYLLIS made it! (author)2010-05-18

 Can i mod my 2.1 for this?

author
RRC made it! (author)RRC2010-06-17

Feed left and right channels into ABC decoder to get four outs, leave subwoofer as is.

author
HADJISTYLLIS made it! (author)HADJISTYLLIS2010-06-19

thanks its going to be great

author
Marble of Doom made it! (author)2010-06-17

Why do people leave the product stickers on laptops and lcd displays? I know I'm a little off topic but it bugs me :p Anyway, great 'ible.

author
RRC made it! (author)RRC2010-06-17

This laptop belongs to lab, no one cares about lables as long as it does the job.

author
tigerdog330 made it! (author)2009-08-01

is there any way to mod the circuit to have center and subwoofer outs too?

author
RRC made it! (author)RRC2009-08-02

Center speaker is not part of this concept. Sudwoofer can be pulled out from any front speaker via crossover network.

author
tigerdog330 made it! (author)tigerdog3302009-08-04

ok sounds good thanks.. ill probably be doing this i my basement now

author
SRChiP made it! (author)2009-06-09

What's the output wattage of the speaker? Can you use the ABC decorder part for a regular stereo amplifier?

author
RRC made it! (author)RRC2009-06-10

0.5 W and up will work well with this option, wattage is limited by amplifier's output power and ABC decoder power dissipation. I'm using ABC decoder with regular stereo amplifier for many years and recently with stereo output of Plasma TV.

author
SRChiP made it! (author)SRChiP2009-06-11

Thanks, but what is the approx. output of the stereo amplifier per channel?

author
RRC made it! (author)RRC2009-06-12

I designed it to deliver 1W per channel.

author
SRChiP made it! (author)SRChiP2009-06-20

Thanks

author
RRC made it! (author)2009-05-09

I'm working on USB Surround Sound - ideal for computers.

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