Audio Electronics

Welcome to my Electronics page. Here you will find various construction details on mainly amplifiers.

Contained here I have some details about my audio systems, including early examples dating back to around the year 2000 which may still be useful and relevant now.

My main audio system is detailed here. This is a 5.1 pre and power amplifier, controlled by PIC, IR, bluetooth and a mobile application. It is an great looking, awesome sounding hifi system that I hope you'll enjoy reading about.

Thats not to say my smaller chip-amp projects were bad, projects based on the TDA1514 or the TDA2040 chips are actually very good and would compete with some smaller commercial offerings.

I still use my first 5 channel power amp built long ago in the bedroom, and it still works great 14 years later (as of 2015).

This page is split into several sections. First are my large projects - containing almost everything you need to know about my largest audio projects. Then there are some general stuff, aimed for hobbyists and those just wanting to read something. You can see various construction details for smaller single chip amplifiers further down in the list of projects.

Guides and articles here are not always wrote to tell you everything, and often supplement semiconductor manufacturers datasheets (which are linked where appropriate).

If you haven't already, I would strongly suggest you check out www.sound.au.com for all your amplifier needs as the author of this site has done very good work on making construction details for many different audio circuits and you should find something of your needs there. Most of my electronic knowledge has come from reading various articles from there, or by hands on experience by taking apart old equipment etc.

Complete Hi-Fi Systems

5 Channel Pre and Power Amplifier

This page contains my recent updates to my hifi system. Previously a separate preamp and power amp combo this has now been merged into one system (to save on space and the amount of wires!).

You'll find here a description of the build, changes I've made and how I've altered the way it looks and operates. Also contained are details of the control system, including control via an Android application.

5-Channel (Bi-amplified) Power Amplifier

For reference - this is the original article about my power amplifier. It is a 5 channel power amplifer consisting of 7 internal power amplifier and a massive 500W power supply. 7 you say? Well yes as the main stereo speakers will be bi-aplified using a 24dB/octave Linkwitz Riley Crossover. Aprox powers are 60, 60, 68, 68, 68 into 8 ohm speakers. Currently this amplifier is being rebuilt into a bigger case and with a 'new' crossover (same circuit, but on one of Rod's brought PCBs) and this time actually with a microchip power management and temperature sensing circuit.

7.1 channel digital preamplifier

Designed to work with the above power amplifier, this preamplifier provides the control over line level audio I'll need in my final system. This preamp is a mix of audio electronics and usage of PIC microprocessors and other digital electronics. It therefore includes an LCD, rotary and push button controls and can be controlled from an external PC. This is still under contruction, but working now as a full 7 channel preamp with three surround sound modes.

120W isobarik subwoofer

To compliment my power amplifier, added response for lower frequencies was needed.

Now complete is my 120W subwoofer, based on the P3A amplifier operating into two 10" drivers and an attractive ported enclosure. Response is good all the way down to 30Hz, and response can be tweaked at many frequencies between 20 and 100Hz. Also includes a microchip power management circuit.

TDA Surround Sound Amplifier

Finished in 2003, the re-build of my original surround sound amplifier finished about two years earlier. This is a re-make of the original amplifier below using more ESP circuits and data sheets from TDA1514 and TDA2040 chips.

A little about my original amp

This is the original surround sound amplifier I had, before the re-build above. It was built back in the year 2001 and remained my reliable source of good audio until I decided I wanted to make it better.

The old surround sound amplifier (pictured left) based on circuits from ESP (www.sound.au.com) and the TDA chip data sheets below.

General Guidelines and Information

Calculators - Useful applets for calculating resistor colour values and capacitor values from three digit numbers. REQUIRES JAVA. Can be viewed online, or downloaded.

Building your own PCB's - Almost Everything you need to know about building your own PCB's, written for novice hobbyists like me using the freehand style of creating PCB's rather then professional expensive equipment. Highly recommended read if your fed up with the limitations of pre-made stripboard.

Wiring an antrim toroidal transformer  - How to wire these transformers for 115V and 230V mains and centre taped (series) and high current (parallel) secondary wirings, plus some PSU guidelines. Although specific to the Antrim wire colours, this article is also revelant to any dual primary and dual secondary transformer, and has helped many people around the world confront their doubts and confusion.

Speakers - My views and short description of how they work. Not the best resource on the web, but includes photos of a real speaker that I disassembled to illustrate its workings.

List of projects

Some of these still need to be added (I will get these done, promise!).

Construction Details Data Sheet Short Description
Bass boost Battery powered bass boost op-amp circuit A battery powered bass boost circuit, ideal for small speakers.
LM386 LM386: From National Semiconductor A low power amp (300mW), short description only, no circuits included.
TDA1015 TDA1015: From National Semiconductor Very tiny surface mount amp, capable of 0.5W
TDA1514 TDA1514: From Philips A very good single chip mono amplifier that is cheap and impressive sounding. Capable of up to 50W.
TDA2822
Some more TDA2822 Projects
TDA2822: From ST Microelectronics Stereo low power amp (700mW/channel), also highly recommended and will suit many situations where a bridged amplifier (such as the TDA7052) is not suitable.
TDA2003 TDA2003: From ST Microelectronics 10W amp car radio amp, all circuits included and detailed, uses single rail power supply.
TDA2006/TDA2030 TDA2006: From ST Microelectronics
TDA2030: From ST Microelectronics
12W amp / 14W amp - simple to build and construct, all details included.
TDA2040/TDA2050 TDA2040: From ST Microelectronics
TDA2050: From ST Microelectronics 
20W amp / 32W amp - simple to build and construct, all details included.
TDA7052
Some more TDA7052 Projects
Some more TDA7052 Projects 2
TDA7052: From Philips Very simple 1.2W amp, my personal recommendation for almost any small amp situation, also includes details on many projects I have undertaken with this chip.

Links above should all be in working order, except for forthcoming projects - notify me if not!

Further projects I propose for the future

I have a few projects to start on soon. The biggest will be a home made clock radio. Basically, I imagined a clock radio that would do what I wanted, sound good, and pretty much guarantee to wake me up! Then I decided I would build it...

Also coming is an ultra-tiny stereo sound system based on the TDA1015T and some old laptop speakers, and a portable subwoofer to help make my TDA2822 speakers sound better!

Links to other sites

Here are some interesting sites that have helped me and people who have helped too

Also coming is an ultra-tiny stereo sound system based on the TDA1015T and some old laptop speakers, and a portable subwoofer to help make my TDA2822 speakers sound better!

ESP: Site for all sound related electronics - fantastic stuff www.sound-au.com
Mark Hennessy: Another sound related site - this one also has great PIC stuff www.markhennessy.co.uk/
Rohit's DIY site: Helped time ago on ESP forums and has some nice projects and a signal generator here: sites.google.com/site/rohitbalkishandubla/diy
DIY audio: Lots of information there and also a nice place to get help from nice people!: www.diyaudio.com/