DIY TGSL STEP BY STEP BUILDING AND TESTING

[Ozoz_xba]

Count of windings is useless information. Measure inductance. Can you send photo of measurement both coils?

TGSL does not work without proper null. Read document and get back after you walk through all measurement points.

My circuit works now.. it regornize the metal 1 coin in all metal mode about 15cm .on the scope my frequency on tx is 21khz...should i make another coil or how should i arrange the frequency on tx on board to get 1 couin from 25-30 cm

[Hyena]

Count of windings is useless information. Measure inductance. Can you send photo of measurement both coils?

TGSL does not work without proper null. Read document and get back after you walk through all measurement points.

[Ozoz_xba]

What is inductance of your Tx coil and Rx coil?
What are exact values of your Tx and Rx capacitors?
What is your null?
Then continue with 101 document...
Tgsl is frequency tolerant until you keep correct Tx:Rx ratios.

What is inductance of your Tx coil and Rx coil?
What are exact values of your Tx and Rx capacitors?
What is your null?
Then continue with 101 document...
Tgsl is frequency tolerant until you keep correct Tx:Rx ratios.

Tx is at 5.5mH induktance 16.8ohm (97 winding)
Rx is 107 winding (both 0.25mmwire)
On the rx is pallaral with 15nf(RXc) capasitor. I didnt pass to the nulling tests yet... i trying yo get closed rx coil to tx (without pot changes)and it dont beep at any metal...

[Hyena]

What is inductance of your Tx coil and Rx coil?
What are exact values of your Tx and Rx capacitors?
What is your null?
Then continue with 101 document...
Tgsl is frequency tolerant until you keep correct Tx:Rx ratios.

[Ozoz_xba]

My frequency first was 14.6 khz and the circuit worked but i regornized that 2n2222 pins was installed incorrect and i put the pins like the open chema... after the frequency get 20khz at tx and rx and the circuit dont regornize the metal no beep coming..
Should i arrange the frequency at least 15khz at tx ?to get the metal dedector work?how to do that?

[Hyena]

I get the scope first 14.6khz is tx and s3cond 20khz is rx..i had both at 14.6khz tx and rx but now them are 20khz how to arrange it?i regnonize that 2n2222 was incorrect inputed and change it.i have now beep but all metal mode dont beep at 20khz...what ti do please?

https://ibb.co/tY8wZpY

https://ibb.co/9hHLwLn

At tx now i have 8dc voltage and approximaly 6 ac

Sorry, I do not understand, can you explain it deeper?

[Ozoz_xba]

I get the scope first 14.6khz is tx and s3cond 20khz is rx..i had both at 14.6khz tx and rx but now them are 20khz how to arrange it?i regnonize that 2n2222 was incorrect inputed and change it.i have now beep but all metal mode dont beep at 20khz...what ti do please?

https://ibb.co/tY8wZpY

https://ibb.co/9hHLwLn

At tx now i have 8dc voltage and approximaly 6 ac.
I regornized the oscilator dont qork at circuit becouse if wrong pleased 2n 2907.. i put it well and oscillator worked

[Hyena]

Hmm, 0,6V of DC on Tx looks good Just kidding. Most of DMM are unable to handle AC at 15kHz, but try it with all your DMMs in AC mode and you will see if any is capable... The same case is pin 6 (/16) of CD4024, which should be square wave (0 to 8V). If your DMM has frequency counter mode, you should measure something around 15000/16 = 938 Hz. Or just check pin 3 (/128 ), where you should see around 15000/128 = 117 Hz, any DMM with frequency counter should be able to measure this. But it tells you nothing about Tx voltage and sinwave purity.

Yes, you can check minus rail with DMM, for example on pin 4 of LF353 (U101a), should be around -6V.

Obtain DSO 138 at least. I bought kit for maybe 20 euro and work well 2 years already. After firmware update it even measure duty cycle, Vpp and other... Than walk through TGSL 101 document. Speaker is on the other end of this path, but with little patience you will get there too.

Without scope we can use only our oracle crystal ball and I still do not handle it well

[Ozoz_xba]

Just 1 thing ..should we use a scope to detect -5v ?or we can detect it also on digital voltmeter?

[Ozoz_xba]

I tryed to get the voltage in digital voltmetre and didnt used an scope..i will buy it near.

https://ibb.co/xshG0Xm

https://ibb.co/THZMbFB

https://ibb.co/ws2sL70

On the 6. pin of cd4023 2.5volt dc
But no noise on the speaker quite dead

[Hyena]

I put the tx but volyage is just 0.6volt dc at there.. i cant get 16 v at tx i checked the board but didnt get where the voltage is stopped(i have 8volt dc at lm7808 )

Measured with scope? Can you show us oscilloscope screenshot of this measurement? Also high resolution image of your board from both sides?

[Ozoz_xba]

I put the tx but volyage is just 0.6volt dc at there.. i cant get 16 v at tx i checked the board but didnt get where the voltage is stopped(i have 8volt dc at lm7808 )

[ripsdevala]

Yes, u need to attach coil to get -5. Try to search the thread u will find all the info

[Ozoz_xba]

Any help please?

[Ozoz_xba]

Regards on your works guys. I have an problem with my circuit .. i connect in rx and tx (with shields) but the circuit was silent.no noise from speaker now i wont to check the +5 and-5v ..should i conecct tx and cd4024 on board without other chips to check for the voltages?have ni scope.. any help will make me happy...
Thx in advance