Car radio with vol control circuit - has electric control plane, controlled by loudness key in microprocessor

摘要

The car radio has a loudness circuit coupled to the vol. control for regulating the appropriate loudness vol. The control plane in a microprocessor (12), allocated to the electric values of the coupling point between the vol. control (7) and the loudness circuit (10), is controlled by a loudness key (LD) and a timer (13). The two components change the values and are connectable to a central rocker switch (15). On the key actuation, first the timer is triggered, and its operation tests and AND circuit (14) to determine if the key is still depressed. The AND circuit enables the action of the loudness circuit. ADVANTAGE - Adjustability of start point of amplifying rate deflection from linear course.