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how do i connect a thumb wheel switch to 4 LEDs in decimal 2 binary converter?
the circuit takes the input from the thumb wheel switch & flashes the LEDs to show the corresponding binary number
1 Answer
- tlbs101Lv 71 decade agoFavorite Answer
Use one of these:
http://focus.ti.com/lit/ds/symlink/sn74ls147.pdf
(note: PDF file is almost 1 Mb)
These devices will only sink a max. of 8 mA and source less than 1 mA. This is not enough to light a typical LED, so you will need a buffer at each output of the 74LS147.
OR... look at the circuit diagram / truth table in the data sheet and make your own out of individual gates (that can drive an LED).
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