Xenobius Posted May 25, 2007 Report Share Posted May 25, 2007 Hello all,I have built this circuit http://www.electronics-lab.com/projects/sensors/008/ and it worked. However I have a problem. I am using a DC adaptor to give it 12v and so im not so sure if its pure dc. The problem is that, IF I touch the positive metal part of the power supply, the circuit works perfectly... if I remove my finger from the positive of the power supply, the RED led (of the circuit LED1) turns ON until I touch the + again.Could this be a filtering problem of the power supply? I put 10uF and 68nF in parallel across the power supply but no luck.Thanks all Quote Link to comment Share on other sites More sharing options...
ante Posted May 26, 2007 Report Share Posted May 26, 2007 Have you grounded the circuit like it shows in the diagram?The Quote Link to comment Share on other sites More sharing options...
Xenobius Posted May 29, 2007 Author Report Share Posted May 29, 2007 Cool thanks a lotI had 2 problems. The gnd was not earthed as you said but also the power supply that I was using had just one diode to make ac into dc and thats was another problem.Thanks Quote Link to comment Share on other sites More sharing options...
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