vin

vin

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vin7803@gmail.com

  FK919 - metal detector (1353 views)

Sep 25, 2017 17:27

Hi,

I've assembled and soldered circuit and have checked and all components appear to be correct, however when powered the LED and buzzer go on, as manual states, however turning VR1 does nothing. LED and buzzer remain on.

Any ideas of what could be wrong?



many thanks

vin

122.60.122.204

vin

vin

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vin7803@gmail.com

Adam

Adam

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adambrewer555@gmail.com

Oct 1, 2017 08:41 #1

check that the vr1 is actually changing the resistance, it might be broken. check if you have the middle loop wires around the right way. I just made this one, it works really well.

118.148.176.120

Adam

Adam

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adambrewer555@gmail.com

vin

vin

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vin7803@gmail.com

Oct 20, 2017 05:12 #2

thanks. Yes, I had a number of students build this kit and seems the main problem has been getting the right order, and also stripping the enamel coating for a clean contact.

203.86.206.120

vin

vin

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vin7803@gmail.com

Vinston

Vinston

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Vinston1909@gmail.com

Nov 10, 2018 13:18 #3

Hi, I am experiencing the same problem with my metal detector kit as vin. The metal detector keeps buzzing and the LED remains on with no change no matter how I try to turn the VR1 potentiometer. Bring any metal near the induction loop does not change the tone or the loudness of the buzzer. I have checked the copper wire connections between the loop and the board with the multimeter and all the components values and placement, which are correct. The only possible explaination why the kit does not work is due to a flawed circuit. Any ideas on what could have gone wrong with the metal detector kit?

Thankyou:)

119.56.69.128

Vinston

Vinston

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Vinston1909@gmail.com

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