"Induction Balance" coil tuning
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Posted by Thomas M on January 17, 2005, 11:49 am
Please log in for more thread options transmit coils that canel each other out and a receiver coil that picks up any disturbance in the canceled field. Winding the coils is difficult to get them exactly tuned and canceled. Is there an electrical component/circuit that can be added that will let us 'dial in' the fine tuning? | ||||||||||||||||
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Posted by John Larkin on January 17, 2005, 2:31 pm
Please log in for more thread options Yes. An RC network that has adjustable amplitude and phase shift would take a bit of the transmit signal and inject it into the receiver; you could then adjust for null. John | ||||||||||||||||
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Posted by Jamie on January 17, 2005, 3:07 pm
Please log in for more thread options Thomas M wrote:
> We have a circuit that is a 50kHz 'induction balance' metal detector. Two
well yes.
> transmit coils that canel each other out and a receiver coil that picks up > any disturbance in the canceled field. Winding the coils is difficult to > get them exactly tuned and canceled. Is there an electrical > component/circuit that can be added that will let us 'dial in' the fine > tuning? > > > a simple Pot between the 2 of them supplying the single to the coils. use the center tap as the feed from the OSC supply. the outer will connect to the coils.! 1 to each 1 leg of each coil. the remaining legs are tied together to the common. i don't know the amount of current you are using but wire wound pots come in a variety of sizes. just use a low R Value... depending on how far off your coils are going to be will determine how wide of a range you need. you could also have 2 AMps driving the coils with a balance control. etc. | ||||||||||||||||
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>transmit coils that canel each other out and a receiver coil that picks up
>any disturbance in the canceled field. Winding the coils is difficult to
>get them exactly tuned and canceled. Is there an electrical
>component/circuit that can be added that will let us 'dial in' the fine
>tuning?
>
>