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Topic: AC current (Read 766 times) previous topic - next topic


Nov 03, 2012, 01:32 pm Last Edit: Nov 03, 2012, 01:34 pm by arduinopi Reason: 1
I got a 12 volt relay from radio shack. here is the data sheet http://datasheet.octopart.com/R40-11D2-12-NTE-Electronics-datasheet-55584.pdf
I am trying to figure out if this relay could generate AC  (I understand the frequency would be limited to the relay's switch time. )
essentially I am trying to make a H-bridge.

I don't know if the data sheet says but this relay has 2, three pole switches
(I think it is double pole double throw)

thank you for your help.

All of my projects --> http://www.frankmagazu.com/


H-bridges are just four switches. And relays are switches so you can build a h-bridge out of relays.

Whether they will do a good job at that is a different question.


can a  double pole double throw relay be used to make an h-bridge?
All of my projects --> http://www.frankmagazu.com/


No, you need 2 single pole double throw relays to make an H-bridge that gives you forward, reverse and stop states.
Formal verification of safety-critical software, software development, and electronic design and prototyping. See http://www.eschertech.com. Please do not ask for unpaid help via PM, use the forum.


can a  double pole double throw relay be used to make an h-bridge?

Absolutely. Connect the load between the poles and the throws to power / ground.


can a  double pole double throw relay be used to make an h-bridge?

See this link for a circuit:-


Building your own H bridges is great to learn about them, but in an application if space is an issue - you're probably better off using an H bridge IC such as the LMD18200 or L298 as these have features such as overcurrent / overtemp protection, seperate enable functions, internal clamp diodes etc.

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