Tgsl completed, help request

[gost373]

Hello, I have just finished the tgsl, problem it sounds continuously ??

[Nandor]

Negative voltage supply!

[CDI]

Negative voltage supply!

...or wrong solder joint.

Happened to my first TGSL.

[gost373]

Hello, I just finished the tgsl, it sounds continually?
TGSL values:

Battery 11volt

R55 = 1.25v
R43 = -5.55v
R54 = 7.87v
LM308 pin4 = -5.55v pin7 = 7.97v
LM308 pin4 = -5.55v pin7 = 7.96v
LM358 pin4 = -5.35v pin8 = 7.96v
LM358 pin4 = -5.55v pin8 = 10.38v
LF353 pin4 = -5.55v pin8 = 7.96v
LM393 pin4 = -5.54v pin8 = 7.96v
LM393 pin4 = -5.57v pin8 = 7.96v

[Nandor]

I think you should have more than -6 volts. As CDI said check for solder joint maybe there is no connection somewhere. Check the diodes in the negative voltage converter D6-7 check the transistors or even the capacitors.

[gost373]

How to check transistor voltage and
Capacitor (voltage value?)

[Nandor]

Are those components new? or used ones? If they are used try to change them. You must achieve -6 volts. Check the continuity of the diodes with a multi meter.

[olecram1]

I happened to put the b140 upside down and that was why it was constantly beeping.

[ashefr10]

Hello, it used a TL081 instead of the LM308, it seems to me that it is necessary to remove the compensation capacitors of 100pF for it to work, could you confirm me, thank you

[Hyena]

Hello, it used a TL081 instead of the LM308, it seems to me that it is necessary to remove the compensation capacitors of 100pF for it to work, could you confirm me, thank you

I am not sure, I just used TL071 (low noise brother of TL081) and it worked as it should...

[CDI]

Hello, it used a TL081 instead of the LM308, it seems to me that it is necessary to remove the compensation capacitors of 100pF for it to work, could you confirm me, thank you

Try with UA741, can go little depeer.

[gost373]

Hello, I answer with a little delay!
I saw on the forum another schema of the TGSL
On this diagram, the bd140 is an NPN and the one I have a PNP?
? Maybe my circuit does not work
For this reason, a sound continues!

[chevesne]

? Maybe my circuit does not work
For this reason

No, you are right, BD 140 is PNP.

[olecram1]

Hi FRIENDS, in the spirit of moving the forum I add an experience. Making some modifications to my TGSL I soldered the d12 backwards and the result was a constant pii although it did not stop detecting. I leave it as an experience just in case someone happens to you.