This is the schematic diagram of power audio amplifier using single power IC LM12 / LM12CL. The design is very simple. This power amplifier needs power supply with dual polarity output ( +, gnd, - ), don't exceed than 60V : (+30V) ; ground ; (-30V).
80W Power Amplifier based Single Power IC LM12 / LM12CL
This is the schematic diagram of power audio amplifier using single power IC LM12 / LM12CL. The design is very simple. This power amplifier needs power supply with dual polarity output ( +, gnd, - ), don't exceed than 60V : (+30V) ; ground ; (-30V).
5W Audio Amplifier based LA4460
This is the scheme diagram of 5W audio power amplifier which can be built for general purpose and can drive speakers approximately 8 to 12 inches. This 5W audio amplifier circuit is based on the Sanyo LA4460 IC. Based on the IC datasheet, the LA4460 has capability to drive up to 12W power output, of course you will need more power in your power supply.
Notebook / Netbook Audio Amplifier
The audio output from a standart notebook or netbook with built-in speakers is low and the quality is also low. Alternatively, you can use a earphones to make good quality audio output, but for some people, earphones is unconfortable for them.
A power amplifier is needed to achieve a high volume. The following diagram is a simple circuit to amplify the notebook’s audio output.
The circuit is very simple and inexpensive, it use power amplifier IC LA4440 (IC1) and a few other components. LA4440 is a dual channel audio power amplifier, so you just need an IC for stereo application. It has low distortion over a wide range of low to high frequencies with good channel separation. Inbuilt dual channels enable it for stereo and bridge amplifier applications.
