two box

[kt315]

1200-1500V pulse and 10-20A in coil. Delta Pulse ))) no wish to answer here more... ended matter for me.

[pito]

Out of curiosity, I made a simplified version as in post #70, it works well, the cola can is detected from 80 cm, the only thing missing is ground balance, I am thinking to adopt it from other schemes, any sugestions welcome.

[kece hon]

[]

[kece hon]

Hi Carl, Hi Forum,

the discussion about "two-box" detector is reopened... My T/R Locator PCB's for testing have arrived today.

a little help please
i followed the instruction to build tr locator / 2 box
i used this latest know working schematics
instead of transistors TIP31C TIP32C i used TIP41C TIP42C which are a bit robust

i used 16 mhz quarts which gives me 3.3 khz, i did try 32mhz the obtained coil frequency was about 5 khz= 4891 KHZ
last quartz i put gave me the exact frequency as mentioned in the project =2048hz
both my coils TX and RX when measured using LRC meter gives 7.00 mh
TX= wire diameter is thicker 0.8 mm and coil resistance is 13 ohm
RX= wire diameter is 0.6 mm and coil resistance is 5 ohm


when calibrating ; i put the coils facing each other , beyond 30 cm distance there is no recepetion at all on the RX coil
the obtained results at 30cm on the scope are shown in the picture

Yellow is TX
Blue is reception RX


**problems**
i need more distance than 30 cm ( the advertised distance for two box is greater than 2 meters for big objects)
there is no significant audio change on the headset whenever i put a big object between the two coils or whenever moving them inward or outward

--Question--
can you help me what is it that iam doing wrong ?? Thanks in advance

[kece hon]

I'm on it, I need to finish the coils...

a little help please
i followed the instruction to build tr locator / 2 box
i used this latest know working schematics
instead of transistors TIP31C TIP32C i used TIP41C TIP42C which are a bit robust

i used 16 mhz quarts which gives me 3.3 khz, i did try 32mhz the obtained coil frequency was about 5 khz= 4891 KHZ
last quartz i put gave me the exact frequency as mentioned in the project =2048hz
both my coils TX and RX when measured using LRC meter gives 7.00 mh
TX= wire diameter is thicker 0.8 mm and coil resistance is 13 ohm
RX= wire diameter is 0.6 mm and coil resistance is 5 ohm


when calibrating ; i put the coils facing each other , beyond 30 cm distance there is no recepetion at all on the RX coil
the obtained results at 30cm on the scope are shown in the picture

Yellow is TX
Blue is reception RX


**problems**
i need more distance than 30 cm ( the advertised distance for two box is greater than 2 meters for big objects)
there is no significant audio change on the headset whenever i put a big object between the two coils or whenever moving them inward or outward

--Question--
can you help me what is it that iam doing wrong ?? Thanks in advance

[kece hon]

Out of curiosity, I made a simplified version as in post #70, it works well, the cola can is detected from 80 cm, the only thing missing is ground balance, I am thinking to adopt it from other schemes, any sugestions welcome.

a little help please Mr PITO
i followed the instruction to build tr locator / 2 box
i used this latest know working schematics
instead of transistors TIP31C TIP32C i used TIP41C TIP42C which are a bit robust

i used 16 mhz quarts which gives me 3.3 khz, i did try 32mhz the obtained coil frequency was about 5 khz= 4891 KHZ
last quartz i put gave me the exact frequency as mentioned in the project =2048hz
both my coils TX and RX when measured using LRC meter gives 7.00 mh
TX= wire diameter is thicker 0.8 mm and coil resistance is 13 ohm
RX= wire diameter is 0.6 mm and coil resistance is 5 ohm


when calibrating ; i put the coils facing each other , beyond 30 cm distance there is no recepetion at all on the RX coil
the obtained results at 30cm on the scope are shown in the picture

Yellow is TX
Blue is reception RX


**problems**
i need more distance than 30 cm ( the advertised distance for two box is greater than 2 meters for big objects)
there is no significant audio change on the headset whenever i put a big object between the two coils or whenever moving them inward or outward

--Question--
can you help me what is it that iam doing wrong ?? Thanks in advance

[pito]

what you have on Tx coil ?

[GeoMax]

Hi kece hon,

you wrote that your coils are facing each other. Facing each other is not correct. The coil arrangement should be like seen in this example picture.



The original web site of the TR-Locator is here:
TRlocator
There you will find instructions for building the coils. It states that with the original coil (according to specifications), a car can be located at a distance of up to 4 meters.

[kece hon]

Hi kece hon,

you wrote that your coils are facing each other. Facing each other is not correct. The coil arrangement should be like seen in this example picture.



The original web site of the TR-Locator is here:
TRlocator
There you will find instructions for building the coils. It states that with the original coil (according to specifications), a car can be located at a distance of up to 4 meters.

Thank you very much
in order to calibrate it you must first put them facing each other for optimal distance
only then you can put them as shown in your image and change the value of coil capacity in series and parallel to obtain resonance
My problem is very low emission ; power not enough range ??

[kece hon]

what you have on Tx coil ?

Tx coil value is 7 Mili henry Yellow is TX it is shown on the scope
or what do you mean by your question ?

[pito]

Tx coil value is 7 Mili henry Yellow is TX it is shown on the scope
or what do you mean by your question ?

what is the voltage amplitude on Tx coil ?

[kece hon]

what is the voltage amplitude on Tx coil ?

121volts

[pito]

not perfect but it is ok, 200V is good, put Tx box 10m away from Rx box , what amplitude you havw on Rx coil ,

[kece hon]

not perfect but it is ok, 200V is good, put Tx box 10m away from Rx box , what amplitude you havw on Rx coil ,

as i said in the first post
if i go beyond 30cm there is ZERO on Rx reception coil , nothing
i'll try synching both coils later with different capacity values
apart from that , do you have any suggestions ? Thanks

[pito]

disconnect the coil from PCB,

put scope on Rx coil withouth C1 = case 1 and with it = case 2. What amplitude you have at 1 m ?