---------- > From: Martin McCormick > To: PICLIST@MITVMA.MIT.EDU > Subject: Re: IR-Control, RC5 > Date: February 17, 1998 17:32 > > Nigel Goodwin writes: > >The UK magazine 'Everyday Practical Electronics' has just published an > >article using a PIC16C84 to decode RC5 signals and control an audio > >controller chip LMC1983. > > What does the LMC1983 do? Straight from the National Semi site: LMC1983 Digitally-Controlled Stereo Tone and Volume Circuit with Three Selectable Stereo Inputs Generic P/N 1983 Contents General Description Features Applications Datasheet Availability, Models, Samples & Pricing ------------------------------------------------------------------------ General Description The LMC1983 is a monolithic integrated circuit that provides volume, balance, tone (bass and treble), loudness controls and selection between three pairs of stereo inputs. These functions are digitally controlled through a three-wire communication interface. There are two digital inputs for easy interface to other audio peripherals such as stereo decoders. The LMC1983 is designed for line level input signals (300 mV-2V) and has a maximum gain of -0.5 dB. Volume is set at minimum and tone controls are flat when supply voltage is first applied. Low noise and distortion result from using analog switches and poly-silicon resistor networks in the signal path. Additional tone control can be achieved using the LMC835 stereo 7-band graphic equalizer connected to the LMC1983's SELECT OUT/SELECT IN external processor loop. TTYL