problem with TGSL - 5v converter block

Hi ,
how are you Mr Eugene and you Mr Xavier

what Eugene said is true cause I build two TGS "Ligth"  with different compenents ,and I found both PCBs too ligth and i have the same problem in the -5 v conveter block .
whene I cheked the operating frequency I get it rigth 14.45 Khz Tx signal, but that oscillator have a negative effect on the conveter block " its current can't be controlled as well as it may.
now I can say that rigth frequency 14.45 khz tx of TGS"Ligth" can possibly not sure control the -5 v converter block to provides -5v or relatively close value.
hhhhhhhhhhhhhhhhhhhh I get -6.45 cause I my TGS "Ligth" is too Light .
here I would share with you this different schematics .
I dont know if you wont to look at different using compenents .
and there is another shematic of IGSL , we can see that sinus signal can be controlled I dont know if we can make the same thing with TGSL.
thanx Mr Eugene and Mr Xavier
best regards
  Numis

Posted on: September 08, 2014, 10:05:03 am

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HI
I forget the IGLS schematic.
there is one more important this that whene we change the Cx 22 nf attached to the Tx coil we can make a small change in the  converting -5 v.
in my case I attach cx 20 nf to the Tx coil and the -6.27 v  becomes -6.45 v ,so it means that the problem in oscillator block and not in the -5 v converter block .
many thanx ...
best regards
Numis

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OK but can you tell me witch compenent,
?
best regards


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		Quote:			Posted by OregonDirtFisher
	Possibly look at the 4th or 5th band of your resistors.  Maybe you both are putting in a larger tolerance value.  Your both are only off by a volt and half.  I don't think it is a circuit board lay out.  If Xavier built three previous ones without problems, same layout and board configuration, then definitely it is a component change.  Tolerance either with the chip or putting in a different tolerance value of resistor.  Maybe a Cap value. ODF

I think you are right.
TGSL is one of the most documented projects on geotech.
And there are hundreds been build with success.
I also think its  components orientation or value that create the problem.
If you can post a CLEAR close up picture of both sides of your bard we may be able to help.


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Yes 22 nf is the correct value on the schematic, on the other TGSL that I build I had a bit more than the -5v but no where near the -6v that the others are getting. I wonder if it's not transistor related? I use the TO18 type and not the TO92 for the 2n2222 and the 2n2907. 

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Xavier

Yes the TO18 package is CBE and the TO92 is EBC (TO18 = Metal can, TO92 = plastic)

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Xavier