Electronics: Using a Relay

Built a simple relay switch to switch between 2 LEDs. Have a question? Please post them in the comments section.

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• electronics
• relays
• breadboard
• lordneverdie
• leds
• electronics 101

[rainbowsalads]

hi : ) nice vid.

Here you use 12 volts dc to switch a relay that can handle up to 240v ..cool.

I wonder do you know how to switch a relay like this using only . 3 volts ac ? ( the signal i hope to use to trigger the relay if from a cd players audio line level out socket which is aprox @ 0. 316 vrms? : )

[michaeljudge88]

@rainbowsalads I tried this once too, it is a bit hard to do. You would somehow have to amplify the voltage enough to trip the replay, I tried with transistors, and was able to spike the current a little, with no real change to the voltage. I'm also not 100% sure if the audio signal is as strong as an electrical signal, coming from the audio line I mean.

[poofde84]

Try to use your "momentary" switch so that when you contact it the green LED lights up and then when you re connect it, it turns off. So one push and it is on and then a second and its off

[eldadmi]

well that helps 2 students from Israel.. really thanx!

[xXxSekaxXx]

hey how did connect the wires to the pins of the relay which to which?

[Zer0360]

nerd

[Logo3801]

@BrushCountryAg03 Radio Shack. Sparkfun()com Adadfruit()com

[rainbowsalads]

@michaeljudge88 - hi , i found a circuit today that uses a "bc548" transistor, so i ordered few of them to try and trigger by line level audio. thanks for your reply i only just saw it today. if i get anything to work with this transistor , i'll post you how i did it . peace : )

[BrushCountryAg03]

I definately admire your skill. Where can I find a good ultra low voltage relay?