Low Power ~2x5W Audio Amp for a kitchen radio - Page 1
Forum section: electronics / projects

author: glatocha
author_rank: Regular Contributor
timestamp: July 04, 2013, 02:40:37 pm
content: Hi,I am designing now a radio for my kitchen. It will be a simple digital radio using TAE5767 chip module.As I know totally nothing about Audio and this is the first approach I want to use some KIT for a audio amp.I found in Poland a 2x5W KIT based in TDA7496, but I am not sure if it is any good and the TDA7496 is unavailable. The TDA8496 looks exactly the same from spec.Do you know any company that sells cheap audio kits like this, I would like to have more options.Important is:- Volume control (can be digital or voltage)- MUTE- Would appreciate StandByAlso I plan to put it in wooden case so the temperature cannot be so big. But if will be a problem I will not install the back.

author: richard.cs
author_rank: Super Contributor
timestamp: July 04, 2013, 03:06:48 pm
content: Not a kit but take a look at the small amplifiers on this page:http://ludens.cl/Electron/audioamps/AudioAmps.htmlI have built a small amplifier for my car based on the second one down, it's just a fast op-amp buffered by a pair of transistors but works pretty well.

author: mariush
author_rank: Super Contributor
timestamp: July 04, 2013, 03:33:48 pm
content: If you have a 12v or 18v laptop charger around, you could build an aplifier using two tda2050 amplifier chips. These get warm and like higher voltages (but then again so does that 7496) but at 18v they'll still output about 5 watts of audio power.The datasheet is here :http://www.st.com/web/en/resource/technical/document/datasheet/CD00000131.pdfThis page shows a project with these tda2050 chips but it uses a split power supply ( -24v DC - 0 - +24v DC) :http://diyaudioprojects.com/Chip/DIY-TDA2050-Hi-Fi-Chip-Amplifier/The datasheet shows the circuit to use with a single power supply, in case you want to use some existing power adapter or atx computer power supply or even a power supply pulled from an old 15-17" lcd monitor.

author: kripton2035
author_rank: Super Contributor
timestamp: July 04, 2013, 04:27:59 pm
content: I did one with a TPA1517P chip from texas instrumentsenought power 6W for my large kitchen ...very simple schematic for that.I have made a pcb if you want .

author: glatocha
author_rank: Regular Contributor
timestamp: July 04, 2013, 09:56:34 pm
content: If you could share the schematic, and board layout would be perfect.Anyway I was always looking for the class D, to make one myself. Maybe it is the time now.I checked also TPA3125 2x10W. There is an EVM board with schematic posted, so I can based on for start. Just would need to add good digi pot for volume

author: Psi
author_rank: Super Contributor
timestamp: July 04, 2013, 10:11:36 pm
content: LM3886Cant beat a gainclone

author: GK
author_rank: Super Contributor
timestamp: July 05, 2013, 12:03:19 am
content: A pair of these should be adequate:http://www.apexanalog.com/wp-content/uploads/2012/08/PA03U_L.pdf

author: kripton2035
author_rank: Super Contributor
timestamp: July 05, 2013, 06:34:58 am
content: Quote from: glatocha on July 04, 2013, 09:56:34 pmhere is a pdf of the boardthe schematic is the one on the datasheetI use a small jst connector for +V GND left and right audioI didnt use the mute pin so you will have to modify the board a little.

author: glatocha
author_rank: Regular Contributor
timestamp: July 06, 2013, 04:56:50 am
content: Thanks for the responses.I am close to design my own class-D AMP with TI's TPA3125D2 2x10W AMPjust concerning the volume control - how big difference is if you use linear or logarithmic digital pot at the input?I think most amp use simple analog linear pot.Those audio or logarithmic somehow cannot find one that match me.

author: peter.mitchell
author_rank: Super Contributor
timestamp: July 06, 2013, 08:57:30 am
content: log pots are better if you're keeping the volume at lower levels.