[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

[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 input of one the driver IC.
i've search the net, but all i found is data selector that select 2 input to 1 output.
this is the oopsite type of fuction that i need.
My question are :
1. what is the part number for the IC that i need?
2. can i use 2 input to 1 output data selector as a 1 input to 2 output data selector?

best regards
Pramono

[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 how to convert this circuit for a single supply opamp such as LM358.
can any body give me a hand?

thank you

[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

[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 darlington transistor array (8 or 16 transistor each single chips)

i have try to find it on www.alldatasheet.com but no luck.

can any body help me please?

thank you :)

[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
:)