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The LM4610 is a DC controlled Tone (bass/treble), volume and balance circuit for stereo applications in car Radio TV and Audio systems. It also features Nationals 3D-Sound Cir- cuitry which CAN be externally adjusted via a simple RC Net- work. An additional control input allows loudness compensa- tion to be simply effected. Four control inputs pro visit page. Multi-channel Audio Codec With Stereo Headphone Amplifier

This The multi-purpose Amplifier using TDA2030 . It is have power 8 watt (RMS) at 8 ohm loudspeakers. It is have low noise be valuable THD (Total harmonic distortion) 0.1% , When friends use Power supply Voltage Source 28 Volt at 4 ohm loudspeakers have output power 12Watt. But be high class the noise increases to are 2 times. Besides still three be usable with Volt supply about 9Volt , but there is the electric power is down respectively. The VR1 use for Volume popularity level of sound signal. By if a friend can’t seek 22K values use 50K values can replace. For other detail about the integrated circuit TDA2030 IC and other , friends see in the circuit better yes.  Circuit Diagram:  

The project produces a battery charger that may be used to charge NiMH, Li-Ion, NiCad, sealed lead acid, and rechargeable alkaline batteries. There are two channels that the charger imposes which can charge two different batteries at a time at up to 2A each while channel A can be used as a discharger alternatively. All necessary parameters are allowed to be set by a 2x16 LCD display with a 5-key keypad while displaying charging/discharging values including mAH when complete. A fixed voltage, current limited output, fixed current, voltage limited output, and a variable PWM output are provided as a bonus. The brain of the circuit is performed by an ATmega32 microcontroller that runs at 16MHz. In the charging circuit, the inductor/capacitor pair are optimized for a 16kHz pulse width modulated signal and provide and provide a smooth DC output. The raw signal is compensated in software for the drop across the current measurement resistor and lead wires while and the voltage input needs to b...