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The MS6714 is a 4 stereo inputs/2-channel outputs digital control Audio Processor for the low voltage operation. Volume, Tone (bass and treble), and balance (left/right) processor are incorporated into a single chip. The MS6714 also has the loudness function and selectable input gain. These functions CAN be built a Hi-Fi Audio system easily. All 2 visit page. functions are programmable via the serial I C bus. The default states of the chip as the power is on are: the volume is -78. 75dB, the stereo 4 is selected, all the speakers are mute and the gains of the input stage, the bass and the treble are 0dB. By MOSA electronics corp. Stereo Inputs And 4-Channel Outputs Volume Tone Balance 

24v DC is a very popular voltage used in industrial settings. This hobby circuit below was designed to accept four different 24v DC alarm input signals, which are then used to drive a single low power beeper. The beeper is a magnetic type with its own oscillator/driver. The four diodes form an “OR” gate so any one of the four inputs will cause the beeper to make noise. A CMOS version of the popular 555 timer is used to strobe the beeper on and off at about 1Hz.   Copyright: Discover Circuits