czp@houxa.UUCP (C.PODARAS) (05/17/84)
hi kids... all arguments aside about eq effects, here's info on a potentially neat toy for those of you ( like me) who thrill to the smell of rosin-core solder and the roar of melting silicon in amplifier output stages: "world's first digitally controlled graphic eq...another technology milestone in consumer linear cmos..." (ahem...national has never been very humble...) national semiconductor has a new chip LMC835, which has 14 freq. bands of 24 steps each on chip. it also has all logic necessary for serial data control from a 3-wire microprocessor interface. "requires only simple opamp buffers and active inductors to make a complete digitally-controlled stereo 7-band graphic eq...two LMC835 circuits can be combined to create a 12-band stereo eq..." specs: thd at 1 khz 0.0015% (typical) s/n 114 db (controls flat) step error 0.1% boost/cut range: either +/- 6db or +/- 12 db be the first one on your block... chuck podaras houxa!czp