Help about tm 808

[remus_im]

did anyone built this detector ? i need help about the datas of the coils .
please help me

[mikebg]

Coils data for TM808

did anyone built this detector ? i need help about the datas of the coils .
please help me

Remus, the correct title of your question is "Coils data for TM808".
There is a section in this forum named "Coils".
Why not put your question in this section?

[perdica 2]

did anyone built this detector ? i need help about the datas of the coils .
please help me

TX = 645uH -1,Ohm
RX = 175mh - 113,Ohm

[remus_im]

hi " perdica 2 ", thanks for the answer,
did you built this detector ?

[mikebg]

Different resonant frequencies?

Perdica 2,
There are capacitors connected to TX and RX coils forming tank circuits.
Did you measured the resonant frequencies of the TX tank and RX tank?

[kt315]

mikebg, there are transformer type coil both RX and TX. a need phase shifting in RX coil is getting by RC link circuit. what you give a schematic is only a simplification of real coil circuit.

[perdica 2]

Perdica 2,
There are capacitors connected to TX and RX coils forming tank circuits.
Did you measured the resonant frequencies of the TX tank and RX tank?

RX resonant Fo apox = 4.600 kh

[mikebg]

mikebg, there are transformer type coil both RX and TX. a need phase shifting in RX coil is getting by RC link circuit. what you give a schematic is only a simplification of real coil circuit.

KT315, I can not figure out what means your term "transformer type coil". Means this one turn coil (like frame) connected to impedance matching transformer like in GEMINI? Please post the real circuitry inside frames!

[kt315]

yes, you are right now. may be this term is not of your world (?) then I offer to use it in this case. you can see this one used in pinpointer on a page from a book.

[kt315]

all files here I only repeat again, not mine.

[remus_im]

It can find this unit a penny at 40cm in depth?