Deep-searching R-TR metal detector schematic.

[lena27]

how many coils contains TX and RX and what
thickness to the conductor of TR locator

looking ;http://www.youtube.com/watch?v=UH-lzuBOzwg

[eclipse]

Sasho's TR schematic drawn by me, with some modifications

STR.pdf

[eduardo1979]

Hello Eclipse.
I wanted to build this project, but I lack the details of the coils. You can help me?
I need the diameter of the wire, the number of turns and the exact measurements of the coils.
I would like to build this project because I have seen the video and I liked it a lot.
Greetings.

[scs]

R2=100ohm.In emiterQ1and emiter Q2 resistor 22 ohm.Coil L1=L2 100turn 27×32 sm.

[eclipse]

Coil measures 5500uH - you can see that on my revision. I'm using thicker wire than the original details (0.56mm in diameter), I think you'll be fine with 0.3mm-0.7mm wire.
If you have LCR meter you can wind rough estimate of the windings are reduce the number if it's too high. I'm using larger sized coils and don't recall exact number of windings as I've made them 6 months ago.

[Artyom]

Coil measures 5500uH - you can see that on my revision. I'm using thicker wire than the original details (0.56mm in diameter), I think you'll be fine with 0.3mm-0.7mm wire.
If you have LCR meter you can wind rough estimate of the windings are reduce the number if it's too high. I'm using larger sized coils and don't recall exact number of windings as I've made them 6 months ago.

Hello. Please tell us more about the operation of the device, its stability, the range of detection of targets in the ground, etc. Do you have a video of his work? Thank you.

[scs]

Coil is with 0.27 mm wire.

[eclipse]

Artyom, I haven't made it yet. And it won't be ready anytime soon due to complex mechanical construction.
I did test some part of the schematic, which worked fine. I noticed that if you don't connect the TX coil and you turn it on - the 2 TX transistors overheat (kind of a design drawback), so you need to make sure you have TX coil connected at all times.

Note: The 78L05 regulator in the schematic there is wrong - I'll be using TLE2426 rail splitter.

[scs]

Good option oscillator. Not heated without coil.

[scs]

Exchange C1-frequency.

[eclipse]

Thanks Sasho I will check it out!
--
Мерси Сашо ще го пробвам!

[eclipse]

Here is the schematic in it's latest version. Includes the proposal made by Sasho for the TX oscillator - it will not overheat the transistors if the TX coil is not connected.

v2.1.pdf

[scs]

Power supply with no problem.P

[eclipse]

Yes that will work nice (instead of the TLE there in my revision).
However I think that it can be improved (see capacitor connection C6/C5 change).

[scs]

Connecting the capacitors depends on the protection of the amplifier output.AC ground is minus with C1.