How do I make an inverter?
You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
M$2 Answers
If that's the case, check the relay's outputs carefully. Many relays have both an NC and an NO terminal, meaning Normally Open or Normally Closed. If you can use the other terminal, you won't have to build any special electronics.
But if your relay doesn't have those outputs, you can either build an inverter using a 7404 style chip and a transistor, or attempt to do it with only a single transistor. You'll want to run the power source for the activation/input coil on your relay through the E-C path of the transistor, with the base properly biased. Before I go any further, tell me if this makes any sense to you :)
You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
M$You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
M$
to add to exertonmusic's answer -- if you can get away with simple logic inversion before the signal reaches the relay (or transistor handling the relay) i'd recommend the use of a monolithic relay or comparator. i've had to use these on a number of occasions, and they're cheap enough to have a decent supply on hand in the event they're necessary http://www.nxp.com/documents/data_sheet/74HC_HCT04.pdf . transistors can wired up to make an inverter but are a little more complicated than the packaged chip.