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    Aaaargh! 555 circuit works well with LEDs but not with relays...

    I built a monstable 555 timer based on John Adams' shematic which stays on for 20 seconds.  The output of that one feeds power to an astable version  of the 555 circuit which blinks every two seconds.  I have LEDs at each stage and everything works perfect.  But when I add a relay in parallel...
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    Simple question about measuring output of a wall mount transformer...

    Hello, dumb question here. I need to use one of those little wall mounted ac/dc converter for a little 555 based project I am doing.  I found an old one that is labeled to have a 9V DC output.  But I put my voltmeter to it, it reads 14volts.  I then tried a couple that were rated at 24v output...
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    How to wire two 555s in parallel?

    Hello.  Newbie here. I read with interest the article by John Adams about using a 555 as a timer I am trying to build a controller that would activate a relay in a "non regular" way.  In other words, when I use the astable example John gives, depending on the values used, the circuit will give...
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