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Topic: DPDT 2 Coil Relay Problem (Read 2697 times) previous topic - next topic

Grumpy_Mike

Because with the load in the emitter you can only ever get the voltage on the base minus 0.7 volts on the coil no matter what voltage the collector is going to.

Where as if the load is in the collector you can get a voltage across the coil equal to the voltage to the other end of the coil minus the saturation voltage Vsat of the transistor.

Aha! That makes perfect sense. Thanks.

boez52

Is this circuit necessary if I am using 3V relay??

AWOL

Quote
Is this circuit necessary if I am using 3V relay??

What is the coil resistance?
"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.

boez52


Quote
Is this circuit necessary if I am using 3V relay??

What is the coil resistance?


The resistance of the coil is 129 ohms

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