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# Detecting 60hz AC Current?

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#### haxor12

##### New Member
I'd like to build a handheld device which can detect a 60hz AC wire inside of a wall. Any advice/tips on how to do this would be much, much appreciated.

Thanks!

#### MikeMl

Go to Home Depot and lay about $10 on the counter. They sell a "stud finder" which includes the 60Hz detector... #### Boncuk ##### New Member Go to Home Depot and lay about$10 on the counter. They sell a "stud finder" which includes the 60Hz detector...

What? So expensive?

They're 1.5 EURO in Germany (US$2.00)! #### MikeMl ##### Well-Known Member Most Helpful Member What? So expensive? They're 1.5 EURO in Germany (US$2.00)!

Yeah, I bought mine about 10 years ago while they were made in the USA. The one that they sell today is made in CHINA.

#### haxor12

##### New Member
Thanks for the tips, I was most interested in learning to build one myself

#### MikeMl

##### Well-Known Member
Thanks for the tips, I was most interested in learning to build one myself

Get a small audio transformer. Chisel off the bar on one side of the core to leave an open E.

Hook it to an ic amplifier (opamp or audio amp) with a gain of several hundred, gain optimized at 60 Hz.

Hook it to headphones and/or a meter-rectifier detector circuit.

#### fernando_g

##### New Member
There are many ways to skin a cat.
Modify a transformer as Mike suggests, or use a linear output Hall efect sensor.

#### RODALCO

##### Well-Known Member
You can also use a 4017 ic.
wire up to 9 volt battery

Leave input (14) open circuit,
Put 15 cm wire on it as areal.
connect one led to one of the outputs and loop o/p 10 to 1.
The led will flicker at 1/10 of the frequency.

I see if I can find schema for it.

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