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  1. O

    Power OFF 555 timer trigger?

    Hi, I have a 12v DC circuit that I want to trigger a 555 or 556 when the power source is turned off! Is it possible without using a relay? Thanks!
  2. O

    555 Timer help

    Hi all, I am looking for a simple 555 circuit to DELAY xxsecs then output go high, essential a delayed one-shot. I also need it to reset on power up, NO manual switch used. I found this circuit but am not sure if it will suffice. Any help would be appreciated. Thanks :)
  3. O

    -12v pulse???

    Hi, I have a 12VDC SPDT relay, C is -12v, what I am trying to achieve is for the NC terminal(coil power off) to receive a -12v signal for a moment like a momentary switch or pulse then 0v. I guess a CAP should sort it out but what is confusing me is the wire connected to NC is polarity...
  4. O

    Weak tranceiver???

    Hi Everyone, My first post here, I know fundamentals about electronics but am learning something everyday. I have a remote central locking module that has a weak signal, meaning you need to hold the remote no further than 30cm away for it to work, yes i have changed the battery in the remote...
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