LM7805C uses UPS Power Supply.

 UPS Power Supply circuit can be use for regulated and unregulated voltages with different regulators and batteries. For 15-volt regulated supply tariffs to use two 12 volt batteries in series and the 7815 controller. There are a lot of flexibility in the circuit.

 

circuit diagram

 

TDA7375A IC Amplifier Circuits..

4 channel amplifier uses an IC TDA7375A and capable of producing power 18watt output for each channel. TDA7375A amplifier circuit can be used to make 2 channel stereo configuration is often applied to sound systems in cars. That is 1 channel stereo for the front and 1 channel stereo for the the rear. Source voltage needed for this amplifier is a 12VDC-15VDC. Amplifier circuit with IC TDA 7375A is very simple and easy to make.