The TDA2611A is a monolithic integrated circuit in a 9-lead single in-line (SIL) plastic package with a high supply voltage audio amplifier. Special features are: • possibility for increasing the input impedance • single in-line (SIL) construction for easy mounting • very suitable for application in mains-fed apparatus • extremely low number of external components • thermal protection • well defined open loop gain circuitry with simple quiescent current setting and fixed integrated closed loop gain.