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I've been trying to turn off a always on led with a push bottom and a transistor? What I want to do is to turn off the led when I push the botton.

schematic

simulate this circuit – Schematic created using CircuitLab

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  • \$\begingroup\$ Please some help I dont't know why it's not working \$\endgroup\$ – user2461687 Oct 17 '15 at 2:03
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I'm assuming your power supply is 5 volts, not 1 volt. As connected, the NPN transistor will attempt to short-circuit the power supply, which probably won't work. Try

schematic

simulate this circuit – Schematic created using CircuitLab

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  • \$\begingroup\$ Thanks so much, and yes the Source is 5 volts \$\endgroup\$ – user2461687 Oct 17 '15 at 0:45
  • \$\begingroup\$ sorry but it's not working :( \$\endgroup\$ – user2461687 Oct 17 '15 at 0:49
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    \$\begingroup\$ What's not working? The LED is always on? Always off? Transistor on fire? What voltages do you expect at key points in the circuit, and what do you actually get instead? \$\endgroup\$ – CharlieHanson Oct 17 '15 at 2:05
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    \$\begingroup\$ The led is always on, but I need to turn it off when I push the button, and it doesn't work as I want, I only whan to turn off the led when I push the button. \$\endgroup\$ – user2461687 Oct 17 '15 at 2:09
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    \$\begingroup\$ I made somthing wrong, I put R1 between the LED and the Colector, thats why it wasn't working. \$\endgroup\$ – user2461687 Oct 17 '15 at 2:12

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