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I need to create a circuit to allow me to toggle a source voltage from one path to another. I need to be able to toggle the path from the first path to the second while a second voltage is active, and go back to the first path when the second voltage is not active, such as in this diagram.

block diagram

P.s. Please do not suggest using a switch, I can only toggle by using a second incoming voltage

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    \$\begingroup\$ Use analog switches. They are electronic devices (not mechanical switches) and can be controlled by voltage \$\endgroup\$ – Claudio Avi Chami Jul 20 '17 at 5:36
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    \$\begingroup\$ Multiplexer.... Electronics stores still exist? \$\endgroup\$ – atomSmasher Jul 20 '17 at 5:38
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    \$\begingroup\$ Use a relay, this will do exactly what you explain. \$\endgroup\$ – Solar Mike Jul 20 '17 at 5:39
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    \$\begingroup\$ "Diagrams are appreciated but not necessary ...". Generally, for electrical circuits, diagrams or schematics are necessary. It's how we communicate. \$\endgroup\$ – Transistor Jul 20 '17 at 6:29
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schematic

simulate this circuit – Schematic created using CircuitLab

Figure 1. Relay voltage source switch.

  • When V2 is not preset V1 will power LOAD1.
  • When V2 is high enough to energise the relay the V1 will power LOAD2.

enter image description here

Figure 2. A typical relay.

  • Choose the relay coil voltage to match V2.
  • Choose relay contact voltage and current ratings to meet or exceed the supply voltage and load current.
  • If using DC check that they are adequately rated for DC.
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What you are looking for is an analog multiplexer. Depending on the input combinaison, a path will be maid from a point to another. If you use a digital multiplexer, the output will be equal to the multiplexer power supply. If you want to have different voltage level on the output you have to use an analog mux.

enter image description here

This solution may not work if the mux drive too much current (see that datasheet for exemple).

To drive larger current, you may need to use relay. It's like a switch but trigger by current instead of your finger. You will need to make a little circuit to determine which relay to trigger but it wont be that hard.

Both component are findable in electronic store a pretty low price. (exept the relay if you want a very large one..)

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