Relay switch

216

04:55:03

The saturated transistor energizes the relay coil.  Check out the behavior of the collector voltage when you remove the flyback diode. 

published 9 years ago

kosinsk3

9 years ago

What's the reason for using multiple grounds? I modified your circuit and it works the same when they're all connected to the one ground. Pardon my ignorance, I'm new at this.

konskala

9 years ago

There is no difference at all kosinsk3.. It's only a matter of how you want your schematic to look like. Imagine that my 4 grounds are connected together at the same point of the actual circuit...

kosinsk3

9 years ago

Okay that's what I thought. Follow up question, does it matter if the ground is connected to one AC source and one DC source?

lenzrulz

9 years ago

The circuit is very sensitive to electronic noise...eliminating the mechanical relay in favour of a logic gate will negate the effects of electronic noise within your circuit.

konskala

9 years ago

Kosinsk3 it doesn't matter. Ground is a reference and every voltage (ac or dc)of your circuit should be referenced to that point.

konskala

9 years ago

Lenzrulz thanks for your advice. But what if I wanted to drive a DC motor that sinks much more current than the light bulb I'm using. Would a logic gate be capable of driving such a load???

lenzrulz

9 years ago

@konskala, solid state relays are a good option for large loads...:)

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