Question about tgsl

[waltr]

But why U100 out didn't divide the oscillator frequency?, and TX shouldn't look as good as I have right?, it should have noise at top of the signal as in the img below

https://i.ibb.co/Z61fFdR/paintastic20200306-171233.png

The little kink on TX waveform is what I have seen on two oscillators I built and what everyone else sees. You had this earlier, what changed??

[waleed]

The little kink on TX waveform is what I have seen on two oscillators I built and what everyone else sees. You had this earlier, what changed??

Yes that what I mean, I had it earlier but I don't see it now, and I bought too many new components and replaced them but still have a problem, should I change the oscillator and charge pump components again for new ones?, I'm confused, let start step by step, first what is responsible for the little kink on the TX signal?,

[waltr]

Yes that what I mean, I had it earlier but I don't see it now, and I bought too many new components and replaced them but still have a problem, should I change the oscillator and charge pump components again for new ones?, I'm confused, let start step by step, first what is responsible for the little kink on the TX signal?,

The tx waveform kink is due to how the bias on the oscillator transistor changes.
There has been lots of discussion and alternate oscillators proposed in the original TGSL and IDX threads. This is why tou will see a two transistor or one transistor oscillator on various schematics. I can not explain the why.
It was finally determined that the original TGS had that kink and making a 'better' oscillator' did not improve the TGSL performance.

[waltr]

The tx waveform kink is due to how the bias on the oscillator transistor changes.
There has been lots of discussion and alternate oscillators proposed in the original TGSL and IDX threads. This is why tou will see a two transistor or one transistor oscillator on various schematics. I can not explain the why.
It was finally determined that the original TGS had that kink and making a 'better' oscillator' did not improve the TGSL performance.

If you really want to know read those original threads (they are very long so will take some time).

[waleed]

So maybe the problem with the transistor itself?, but the the weird thing is that why TR8 and TR11 getting hot with and without the coil?, and there is no negative voltage

[waltr]

So maybe the problem with the transistor itself?, but the the weird thing is that why TR8 and TR11 getting hot with and without the coil?, and there is no negative voltage

?????
At this point I would need to have the circuit in my hands to troubleshoot.

[waleed]

?????
At this point I would need to have the circuit in my hands to troubleshoot.

The last thing I'll do is to change all oscillator and charge pump components,I'll see

[waleed]

Waltr I removed all oscillator and charge pump components from the board, but before I replace a new components can I check for the negative voltage on a pref board?, I mean I want to test the oscillator plus the charge pump on a pref board,it will give me negative voltage? Or they should be connected on the board to achieve that?

[waltr]

Why would it not work on a perf board.
Only possibility is no load so just put a 1k-2k resistor across the harge pump output to provide a small load.

[waleed]

Waltr, finally the device is working again,I changed some components to solve the problem, and I tested everything all seems good, I made the coils exactly as dbowers document (same template and turns) and the same way you did, then I connected the coil but the deepest null I reached was 0.20v I did it on multimeter not on oscilloscope, then I was able to reject ferrite then iron but I couldn't reject foil, maybe the difference frequency between TX and RX is not correct? Or the phase shift?, what would make foil not rejected?

[waltr]

Waltr, finally the device is working again,I changed some components to solve the problem, and I tested everything all seems good, I made the coils exactly as dbowers document (same template and turns) and the same way you did, then I connected the coil but the deepest null I reached was 0.20v I did it on multimeter not on oscilloscope, then I was able to reject ferrite then iron but I couldn't reject foil, maybe the difference frequency between TX and RX is not correct? Or the phase shift?, what would make foil not rejected?

GREAT news.
I feel you really need to use a Scope to check what the RX to TX phase is when Nulling.
A DVM can be used and the TGSL will work quite well. For now finish and use the TGSL. That is what I did with the first coil I built and it worked well in the field.
My second coil was near perfect but in field performance was not a lot better.

What size piece of foil did you try? I use two pieces, one less than 1x1cm which should reject with Disc control at abut 1/4 turn.
Then one no larger than 2x2cm which should reject at almost 1/2 turn.
Larger pieces of foil will not reject.

[waleed]

GREAT news.
I feel you really need to use a Scope to check what the RX to TX phase is when Nulling.
A DVM can be used and the TGSL will work quite well. For now finish and use the TGSL. That is what I did with the first coil I built and it worked well in the field.
My second coil was near perfect but in field performance was not a lot better.

What size piece of foil did you try? I use two pieces, one less than 1x1cm which should reject with Disc control at abut 1/4 turn.
Then one no larger than 2x2cm which should reject at almost 1/2 turn.
Larger pieces of foil will not reject.

The piece of foil I used was about 5x10cm, oki I'll try as you said, but I want to ask how exactly you shielded your coil?, did you mix the graphite powder with epoxy and put it directly on the coil?, or you wrapped an electrical tape on the coil and then you wrapped a naked wire around the tape after that you installed the mixed powder,right?

[waltr]

I mix graphite power with polyurethane (a finish for wood) in a ratio of 1 part graphite to 2 parts polyurethane by volume.

I mix a small batch and paint on a piece of cardboard to test conductivity. When dry getting resistance of 200-700 Ohms on DVM leads about 1 cm apart. I tested many paints and glues to mix with the graphite and found polyurethane worked the most consistent

On the TGSL coils I first wrap with electrical tape. then wrap a spiral of thin bare wire at about 2cm spacing. Used wire wrap wire with the insulation removed. This is tinned 34 ga. Be sure to leave enough extra to connect to the cable ground.

Then paint on the graphite/polyurethane mixture. Last is another layer of electrical tape.
This is close to what the Russian guy's TGSL video shows.

Test patches and sample wire.

[kt315]

guys we mean HIGH VOLTAGE if we say about electrostatic field protection. 1...2...5...10 KILOvolts. 1000... 2000... 5000... 10 000V.
you CAN NOT measure resistance of ESFP layer by your ORDINARY Ohm meter. you have to use MEGA-OHMMETER megohmmeter. yes, i know this class
of instruments is sure unknown for you, but try learn electronics.
ok, you know now that MEGAOHMETER measures a resistance given HIGH voltage (on probes)
because there is a HV CONVERTER 'STEP UP' inside it. read in your language https://en.wikipedia.org/wiki/Megohmmeter

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[6666]

I mix graphite power with polyurethane (a finish for wood) in a ratio of 1 part graphite to 2 parts polyurethane by volume.

I mix a small batch and paint on a piece of cardboard to test conductivity. When dry getting resistance of 200-700 Ohms on DVM leads about 1 cm apart. I tested many paints and glues to mix with the graphite and found polyurethane worked the most consistent

On the TGSL coils I first wrap with electrical tape. then wrap a spiral of thin bare wire at about 2cm spacing. Used wire wrap wire with the insulation removed. This is tinned 34 ga. Be sure to leave enough extra to connect to the cable ground.

Then paint on the graphite/polyurethane mixture. Last is another layer of electrical tape.
This is close to what the Russian guy's TGSL video shows.

Test patches and sample wire.
[ATTACH]49667[/ATTACH]

Is the polyurethane oil based ?