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i tried hooking up your circuit however with no current going through the sensor the sounder was on continuous and once i applied current it started to beep really fast. on your drawing, which inputs are the inverting and non-inverting inputs of the op amps thanks

i will give that a try thank you very much

I've never used a flip flop before so i'm not sure what type to use or how i would hook it up any insight into that. thanks

So I think I know why I'm not getting a very good output from my op amp and that is because the signal I'm getting is being pulsed so it isn't ON the whole time, it is ON 32ms and OFF 32ms is there a way to get a constant signal from that somehow??

So I'm trying to use a single supply op amp TLC081 i have the following circuit setup here is the output of both the current sensor and of the opamp i just can seem to get enough output to turn on the transistor any ideas CH2 = Output of current sensor input to opamp CH3 = output of opamp...

Ok so I'm taking a different approach, I took my small signal and ran it through a LM741 op amp, using a +-12V supply and it worked, schematic below. However that was just a test to see if it would work, now I need to figure out how to power the op amp with just a single supply of either 5V...

Operahouse I'm not sure what you mean by operating Q2 off of the 5V directly anyways here is another picture of something i'm trying i'm using a bridge rectifier to convert the ac to dc. when i measure the output voltage from the rectifier i'm getting over 100V but if i add a LED the voltage...

so this is the circuit that i have, V1 is the AC source from the current sensing transducer and V2 is a 5VDC voltage source. this drives the buzzer but it is so quiet you can barley hear it, so i'm not sure if there just isn't enough current to saturate the transistor to turn it on or what...

i got the CSI-0100, what do you mean by second pass of wire through the center hole?

so i got one of these http://www.inductech.com/current_sensing_transformers/current_sensing_csi0T.htm and put one of the output wire of the transformer through it and i'm getting about 1.5VAC output from it. Does anyone have any ideas how i can use that signal to power a buzzer?

i don't have the option of changing the transformer i just need to turn on a buzzer when there is live output from the transformer

yes the transformer is high frequency approx 21khz

would something like this work http://www.inductech.com/current_sensing_transformers/current_sensing_csi0T.htm

yes it is just a go no go situation, do you have any recommendations on toroid and rectifiers for my application thanks

is there any way to accomplish this without the need for an external 5V, like is there any way to use the output of the transformer to power my 555 timer

the output of the transformer is approx 230VAC i have attached the picture of what i have to work with, some how i need to detect when there is output from the transformer http://files.engineering.com/getfile.aspx?folder=bc315c7f-9a3c-4be3-8dcd-6cb34cf2a409&file=circuit_help.JPG

I'm trying to have a buzzer beep when current is applied to a transformer, spec sheet attached. I have an idea of what I would do I just want to run it by you guys and see what you think I was thinking of using one of these current sensors...