Suppose I have four circuits (X1, X2, X3, and X4) that are powered by a single 12V source. The current draw for each is minimal (< 1 amp). I only want one circuit powered at a time. I could do this with four SPST switches. However, what I would like to do is push one switch (perhaps a momentary ON switch) to select the desired circuit and turn it on (while ensuring that the other three are off).
See attached diagram for a visual explanation.
My questions are:
(1) If I used a decade counter to cycle through the selections, would I need to use a transistor in place of each switch and connect the Q0, Q1, etc. outputs from the decade counter to the base of each transistor? Or would the output from the decade counter mirror the supply voltage AND be able to support currents < 1 amp? The data sheet for a typical counter (i.e., NTE 4017) didn't tell me a lot.
(2) Should I attempt to use XOR gates to do this?
(3) What about relays? Is there a relay setup that I'm not thinking about? For example, using four relays and four switches in some combination where when one relay is "on" the other three automatically are "off"?
(4) Are there any other possibilities that I should consider?
Thanks!
Ray
See attached diagram for a visual explanation.
My questions are:
(1) If I used a decade counter to cycle through the selections, would I need to use a transistor in place of each switch and connect the Q0, Q1, etc. outputs from the decade counter to the base of each transistor? Or would the output from the decade counter mirror the supply voltage AND be able to support currents < 1 amp? The data sheet for a typical counter (i.e., NTE 4017) didn't tell me a lot.
(2) Should I attempt to use XOR gates to do this?
(3) What about relays? Is there a relay setup that I'm not thinking about? For example, using four relays and four switches in some combination where when one relay is "on" the other three automatically are "off"?
(4) Are there any other possibilities that I should consider?
Thanks!
Ray
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