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I am very new to my position which is power system reliability and maintenance engineer at a Tire MFG plant. I inherited this job and a circuit breaker refurbishment project. The project consists of sending out Westinghouse DS-206, electrically operated, circuit breakers out for complete...

thanks everyone for your ideas. i have now used the idea suggested by pebe and the problem is solved. thanks pebe. thanks eng-tips, great forum. i will be back quite soon i expect.

i would like to amplify a 50Hz ac signal with a variable amplitude of anything from aprox 1mV to 25mV peak...why?... i am currently using a hall effect CT to monitor the output current from an ac generator. i get a dc mV signal from the CT that acts as the input to my prototype engine speed...

it sounds like you have not used a cap on the reset pin of the 555 timer. a 1uF will do the trick. it is also good practice to put a smoothing cap on vcc+ to prevent spuriouse triggering. hope this helps. you can read more on 555 circuits by going to 'google.com' and searching for '555 timer...