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  1. K

    1 to 2 data selector

    Hi there, I have search on internet to find that 8 bit 2:1 demux but no luck. can any body tell me the part number? thanks, regards Pramono
  2. K

    1 to 2 data selector

    Hi all, I got a little confused with the data selector. im looking for a data selector to select 8 bit of data comming from a micro controller port going to one of two led driver IC ULN2803. i plan to use 2 of quadruple 1 to 2 data selector. this means 1 bit from microcontroller can go to the...
  3. K

    Alarm sound detector schematic

    Hi there Guru... Im thinking to use some kind of bandpass filter with 4 Khz as the center frequency and use high value of Q. I got the article from http://www.electronics-tutorials.com/filters/active-bandpass-filters.htm but i think the opamp used is double supply opamp (+ gnd -). i dont know...
  4. K

    Alarm sound detector schematic

    Hi there, guru.. i agree about "Many sounds contain 3kHz and 4Khz frequencies, including noise". can you help me to share info or internet link, about how to design a frequency filter amplifier using 2 opamp to let only 4 Khz
  5. K

    looking for active high output demultiplexer

    Hi all, i'm a newbie. can any body please share me some information about demultiplxer IC. im looking for a 4 to 16 bit demultiplexer IC with active high output. normally i use DM74LS154N which gives active low output. I also looking for an 8 bit led driver IC to drive 200 mA current. or a...
  6. K

    Alarm sound detector schematic

    Hi all, im a newbie. :-[ can anybody help me to get a schematic for alarm cound detector. basically it's only use to give a digital output high when it detects a sound with certain frequency. in this chase is 3 to 4 Khz alarm sound. thank you :)
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