This post covers a few different (very basic) techniques for amplifying various sound sources. On the one hand sound coming from circuits inside toys that make sound (toy piano, singing greeting cards, recording and playback modules…), as well as sound made by generating frequencies using a microcontroller such as the ATtiny or anboard. On the other hand, audio coming from your laptop computer or mp3 player.
Various hardware for sound amplification:
Amplified Greeting-Card Sound Circuit
Using a TIP122 transistor >> de.rs-online.com/web/p/transistoren-darlington/3136900/
Circuit on paper:
Circuit on wood:
Amplified ATtiny/Arduino Sound Circuit
Hacked Amplified Speaker Module
A cheap and easy way to amplify the sound coming from your laptop computer or mp3 player is to buy a cheap amplified speaker module (make sure it uses batteries and doesn’t just run off the power of the audio supplying device!) and to hack it open and connect it to some fabric speakers for example.
Amplified speaker modules:
– Clas Ohlson >> http://www.clasohlson.com/no/Portabel-h%C3%B8yttaler-Exibel/Pr383986000
– Design Torget >> http://www.designtorget.se/designtorget/se/webbshop/Teknik1.Hogtalare_mini.dcp
To amplify the sound coming from an mp3 player to a fabric speaker:
Hacked amplified speaker module: