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Offline numisNGSTopic starter
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« on: August 28, 2014, 08:29:27 am »
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HI .
how are you ?
I get a problem with my TGSL exactelly in - 5v  converter block
whene I use TR8 2n2222 it provids -5.55 v and it get hot than my TGSL start beeping , I tried to change it with bc337 witch provids -6.47 v but it operates with normal temp and the TGSL have a poor detection . the options: GEB  , Disc and sens not works .
please how to reduce -6.47v to -5v ? witch compenent I have to change ?
thank you .

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« Last Edit: August 28, 2014, 08:35:21 am by numisNGS »
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Offline Homefire
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« Reply #1 on: August 28, 2014, 08:47:06 am »
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  Sounds like your pulling to much amperage.  Isolate sections using the 5v one by one and see if you can find the one pulling more then it should.

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« Reply #2 on: August 28, 2014, 08:57:52 am »
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Without seeing the schematic of the one your building,  you might want to try either the BC548 which is pretty similar to the 2n2222 or even try the 2n3904.  The 3904 switches at a much lower current rating, so it might not work as well.  Again without seeing the circuit I would venture to guess you have a resistor in there that is not holding back the current to cause the over heating of the transistor [it is switching at a very high rate/ or amplifying way to much (saturated state) .  Re check the values, you maybe over driving the transistor.  You also maybe dealing with regenerative feedback into the transistor which again would be an out of tolerance resistor at the return path into the transistor.  Just a guess mind you.  Someone else on here probably has a schematic and can better judge what maybe happening.

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« Reply #3 on: August 28, 2014, 09:19:40 am »
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  I have the schematic  for the basic build .  Like you said what one did he use? 

One version calls for BC 547 in place of the 2N2222.   

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« Reply #4 on: August 28, 2014, 09:26:54 am »
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It may not even be the transistor, the 2n2222 is a pretty stable component. Rarely have I seen them fail other than the circuitry around them over saturate them,  could be as simple as just looking at the color code wrong and miss calculated the values of the components installed around the transistor.  I like your idea,  to disconnect circuitry around that particular circuit.  It isn't a too far fetched idea that you maybe loading down the -5v circuit.

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« Reply #5 on: August 28, 2014, 10:59:32 am »
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  Yep, it could be all of above.  Bad Bias,   Bad 2n2222, Over loading, or just a bad chip using the power.   So Much to work with.  Got to start at the Source and walk down the line.  Not so hard to find, just takes time.

  I was working under assumption that he Verified all componites.    But you know how that works.  When you look at the same thing so many time you see the same thing and it's ok.   Need to have someone else have a look and see if they see the same thing y0u do.

  Worked Telecommunications in the Military.  Trouble Shooting was always starting at a Good Signal following  it until it ended.   Same with Power.  Just a Process of Elimination.  Not hard.  Just takes time and Effort.

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« Last Edit: August 28, 2014, 11:15:49 am by homefire »
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« Reply #6 on: August 28, 2014, 11:24:29 am »
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Agreed, and same here for Electronics ! old EW for the Air Force, still working Electronics now just for a different group Smiley

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« Reply #7 on: August 28, 2014, 01:11:37 pm »
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  There ya go.   See you got a little bit of good out of it like I did.    700 hours of school at Kessler AFB   8 Hours a day for more then I needed.  And 11 years of service.

Ya must had learned something in the Mess.   I went through basic electronics, Radio , TV and Telecom of the day.  Old Hat now days.  1200, 19,200 , 56KBt is nothing any more. 

Worked for a Telecom Microwave outfit that used QUAM modulation that was weird.  Amplitude, FM and Phase .  They provided a back bone coast to coast  .  Then they went Fiber.  Things got better.    Got to learn that.   96 individual Signals on a fiber 26 fiber to the wire Each of the 96 signals could carry 12 ds 3's or a Rail.Three DS 3 or three times twelve voice channels that could support 24 data channels each.     Most I had worked on in the USAF was a UC64 over Tropo Scatter  doing 600 Voice channels.  Or Wire line and Micro Wave. Again 600 channels.    Metal detectors are cool and that's are thing.    I'm more then sure we can fix or find the problems here.  Just need the information.

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« Reply #8 on: August 29, 2014, 09:53:31 am »
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I was looking at my schematic, there should be a 2n2222 and a 2n2907 in that circuit. There is no point in changing anything, if the transistor is getting hot then you have an overload somewhere, could be a cats whisker on the PCB, bad component, component orientation, component value, and so on.     

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So many questions so little time

Offline numisNGSTopic starter
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« Reply #9 on: August 30, 2014, 09:05:20 am »
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HI.
THANK YOU FOR YOUR HELP.
THIS IS THE SCHEMATIC i USE . PLEASE LOOK aT tr8 2N2222 THE PROBLEM IS THAT tr BECOME TOO HOT WHENE i ATTACH THE tx TO PCB AND IT PROVIDS -6.14 V NOT -5V i TRIED bc337 HE WORKS WITH NORMAL TEPMRATURE BUT IT PROVIDS -6.45V WHERE IS THE PROBLEM HERE HOW CAN i REDUCE THE NEGATIVE SUPLLY,?
THANK YOU

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