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fast switching with transistors

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bobnagga

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Hey, what's up, ladies and gents? I'm new here, the name's Andrew. I've been researching all day trying to find out how to use transistors to replace relays.

I want to get it to switch on and off as fast as possible, but the only guides I get are the basic "transistor as a switch" that use a switch to power the base fore constant current...

Anyways, if you can imagine a relay with a battery attached to the coil on one end and the NC side attached to 1)the other end of the coil and 2)the other end of the battery, you'll see what I'm trying to get. It's basically its own kill switch: as soon as it powers, it cuts the power... over and over again. Get it?

And all I can get from the net is constant power... I have four NPN transistors and I don't know how to wire them to be their own kill switch that allows current once the current has been killed. If that makes sense. Any help would be awesome. I could provide a drawing of what the relay circuit would look like if anyone needs it.
 
The relay is configured as a buzzer?

Transistor equivalent might be 'blocking oscillator'.

Transistors (even 'slow' ones) are so much faster than relays that your components will be chosen for the speed you want.
 
Yes, That's exactly right, the Relay is a buzzer. What's this blocking oscillator?


Edit: Never mind, I googled it. Who'da thunk a cap would delay that thing most of the cycle? Now I just gotta design that circuit with the oscillator instead of the relay! Thanks a miL!
 
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