Tgsl problem help.

[ranis]

Good night, sorry if there is another topic on the same subject and sorry for my English.
I set up tgsl for about 2 years, due to lack of time and some assembly problems, I was unable to solve some problems. My detector has the following characteristics.
Coil tx 6.00 mH, 23.4 Ohms.
Rx coil 6.51 mH, 24.8 Ohms.
I can't get the -5vts, in block 3.
I have -2.83 Vts.
Ivonico says it must be close to -5.
Monitoring pin J1-1 with an oscilloscope, I see that I am out of the value of the TGSL_101.pdf file.
My detector is working, but has little sensitivity.
Thanks.
Can someone help me.
.

[waltr]

Scope picture of TX, J1-1, shows 8.6 cycles but scope time base is unknown. This freq does not seems correct.

For the -5V, check pin 12 of U100. Then the collector's (Tr7 & of the charge pump.
If not looking ok recheck the transistor's pin outs. They can have three different pin out depending on where you purchased them.

Lets get this working then move to next problem step by step.

[ranis]

Good afternoon friend Walt, thanks for your attention, the oscilloscope was configured in 5V / Div and .2ms St / Div.
I will check the U1 pin (4024), to check this point on the u1, it would be with an oscilloscope, it could help me, I do not have great knowledge in oscilloscope. The Tr7 would be 2n2907 or 2n2222, in the scheme I do not identify Tr7.
Thank you for your good will and time to help me friend, a big hug.

[Nandor]

Transistor placement is very important! That should be the problem, next time try to make a cleaner pcb.

[ranis]

Good afternoon Nador, what would this Transistor be talking about, in the image the transistors selected in red are 2n2222 and the yellow ones are 2n2907.
Nador what do you mean about making a pcb cleaner?
Thanks.

[ranis]

[waltr]

Good afternoon friend Walt, thanks for your attention, the oscilloscope was configured in 5V / Div and .2ms St / Div.
I will check the U1 pin (4024), to check this point on the u1, it would be with an oscilloscope, it could help me, I do not have great knowledge in oscilloscope. The Tr7 would be 2n2907 or 2n2222, in the scheme I do not identify Tr7.
Thank you for your good will and time to help me friend, a big hug.

Yes, all measurements with O'scope. U101 pin 12 should have a square waveform at half the TX oscillator frequency.

I use the TGSL EDU schematic as in the TGSL_101.pdf for reference designators (U101, tr7, etc). Tr7&8 are Q4 &5 in the schematic you posted.
Also NOTE that the TX oscillators are different in the EDU verse the schematic you posted. Which did you use??

With the scope time base at 200usec/div, that means there are 8.7 cycles in 2msec which is 4.35kHz. Frequency should be 14.5kHz.
Re-check this.

[ranis]

Yes, all measurements with O'scope. U101 pin 12 should have a square waveform at half the TX oscillator frequency.

I use the TGSL EDU schematic as in the TGSL_101.pdf for reference designators (U101, tr7, etc). Tr7&8 are Q4 &5 in the schematic you posted.
Also NOTE that the TX oscillators are different in the EDU verse the schematic you posted. Which did you use??

With the scope time base at 200usec/div, that means there are 8.7 cycles in 2msec which is 4.35kHz. Frequency should be 14.5kHz.
Re-check this.

Hello Waltr, I understand I had forgotten that the file has other names.
So I used this scheme that has the bf245, I will turn on the oscilloscope and check the pin 12 of the U100, as for the Tr7 and 8 I checked the scheme and the pins, several times and I am as it is in the scheme, collectors and emitters in the scheme position, are correct friend.

This is the layout of my Pcb.

[Ozoz_xba]

If you dont have -5v?
1. Check for the frequency on 12.pin 4024?should be 7.2 khz nearly.
2.check for 2 diodes near 220uf capacitors ,shoul get damaged not working well,you should have -5v at this diodes 1n4148 near 2n2222 and 2n2907,also if you have -5v there then test lf 353 ouyputs if its works.
If you have -3v at previous doides then check for them also check 2n2222 and the 220uf capacitanses

[Nandor]

Try to make a cleaner job with your pcb's, it helps a lot. Finding trouble on a clean nice pcb is much easier than on a bad looking pcb with bent components. Wires that go to the potmeters should be short and separated from each other.

https://i.imgur.com/cGRBKlq.jpg

[Nandor]

The negative voltage supply is very important, if you make it right you should get about -6.5 volts.
Under -6 volts it wont gonna function properly!

https://i.imgur.com/jFfSWvJ.jpg

Pierce Brosnan is watching you !!!

[ranis]

Boa noite, obrigado a todos, hoje recebi o novo cd4024 e lf353, amigo Nandor, entendo que tentarei verificar essa limpeza e os fios do potenci?metro, tamb?m vou verificar o pino 12 de 4024.
Obrigado a todos por sua ajuda e prezado 007.

[ranis]

Good night, thank you all, today I got new cd4024, and lf353, friend Nandor, I understand I will try to check this cleaning and the potentiometer wires, I will also check pin 12 of 4024.
Thank you all for your help and dear 007.

[ranis]

[CITA??O = waltr; 265764] Sim, todas as medi??es com O'scope. O pino U101 12 deve ter uma forma de onda quadrada na metade da frequ?ncia do oscilador TX.

Eu uso o esquema TGSL EDU como no TGSL_101.pdf para designadores de refer?ncia (U101, tr7, etc). Tr7 e 8 s?o Q4 e 5 no esquema que voc? postou.
Observe tamb?m que os osciladores TX s?o diferentes na vers?o EDU do esquema que voc? publicou. Qual voc? usou ??

Com a base de tempo do escopo em 200usec / div, isso significa que existem 8,7 ciclos em 2msec, ou seja, 4,35kHz. A frequ?ncia deve ser 14,5 kHz.
Verifique novamente. [/ QUOTE]


Boa noite Waltr, verifiquei o pino 12 do u100, prendi a imagem com 5v / d & 20uS e no pino 6 do u100 com 5V / d & 20uS, como na imagem.
Thanks for listening.


Thanks for listening

[ranis]

Thank you all.

[QUOTE = Nandor; 265783] A fonte de tens?o negativa ? muito importante; se voc? acertar, deve obter cerca de -6,5 volts.
Sob -6 volts, ele n?o funcionar? corretamente!

https://i.imgur.com/jFfSWvJ.jpg

Pierce Brosnan est? de olho em voc? !!! [/ OR?AMENTO]

Nandor, troquei todos os transistores, verifiquei todos os PNP e NPN em suas posi??es corretas, troquei os capacitores de 220uf do circuito no bloco 3 e nada mudou.
Uma d?vida o -5v, s? ocorre com o campo nulo?
Eu tenho no primeiro diodo como na imagem -6.42v, mas no segundo eu n?o tenho voltagem alguma.
Vou consertar os fios dos potenci?metros Nandor.

Na imagem u100u101, os dois canais do oscilosc?pio foram medidos a 5V / d e 20uS / d.
A imagem u1017 est? no pino 7 do u101, medido com (.5V) / d & 20uS / d, porque eu n?o poderia faz?-lo com .1V / d & 20us, como no arquivo Tgsl101.