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Kemo B197 12 VDC Relay Card Module Kit
Does this circuit require independent 12VDC power supply in addition to separate trigger signal?
See link for datasheet below;http://www.parts-express.com/pedocs/tech-docs/320-550-kemo-electronic-b197-technical-document.pdf
Generally the purpose of a relay is to isolate a higher current/different voltage circuits from the user.For example in a car, a relay is used when the car is started. When the key is turned (switched) it activates, with little current, a relay that can handle the current requirements of starter motor. Without a relay, all that current would flow through the switch (key) and poses danger to the user.This relay uses a 3-12 volt input (dawing ~5mA) to turn another part of your circuit that is up to 30V and 3A.You should not need a separate power supply, unless the circuit you are trying to control has different voltage requirements.For example driving a 12volt motor can be done with one power supply. However with a 24V device, you would need a separate 3-12 volts. You don't have to get separate supplies, just regulate the 24v to 12 volts with a voltage regulator (linear[plus heat sink] or switching).
Date published: 2013-07-18
Latching relay question
Is this a latching relay circuit that operates on-off with a momentary switch?
I could not find the data sheet on the relay in the picture, but I did find a suggested replacement part which was a General Purpose relay. So this is not a latching relay.
Date published: 2013-04-13