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Re: [softrock40] Ensemble RXTX Problem 3.3 volt supply

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  • Sid Boyce
    I would recommend Chip Quik. The first time I ordered some with other stuff I didn t recognise it as I expected something larger for the price, not a thin
    Message 1 of 7 , Nov 30, 2011
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      I would recommend Chip Quik.
      The first time I ordered some with other stuff I didn't recognise it as I expected something larger for the price, not a thin non-descript bit of wire in what looks like a drinking straw..
      It's a brittle length of low melting point solder, when applied it makes it easy to lift SMT components off the PCB.
      73 ... Sid.

      On 30/11/11 20:38, Albert Gerheim wrote:  

      "renew"?  Is this the same as replace?  My experience soldering stuff this small is minimal, so de-soldering it would be "very hard".  I think I got "OL" (overload) with the ohmmeter on pin 4.  Lemme look again, though.  




      On Wed, Nov 30, 2011 at 2:13 PM, Alan <alan4alan@...> wrote:
       

      ----- Original Message -----
      From:
      Subject: [softrock40] Ensemble RXTX Problem 3.3 volt supply

      > Is there any chance I could have a defective regulator? (LP2992AIM5-3.3V)
      > When I completed the second part, the test voltage measured about 4 volts
      > versus 3.3. I figured it might drop under load. After I completed the
      > next stage, here are the voltages I'm getting:
      > Pin 1: 5V
      > Pin 2: 0V
      > Pin 3: 5V
      > Pin 4: 2.89V
      > Pin 5: 0.986V (this should be 3.3 volt out).
      >

      There have been a few unexplained instances of trouble with this regulator.
      It's output should be 3V3, this normally is seen at all times, loaded or
      not.
      Pin 4 is higher than normal, all I can suggest is to renew the regulator.
      Make sure there is no flux residue, especially around pin 4 which is a high
      impedance point.

      73 Alan G4ZFQ




      --
      Al Gerheim
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      -- 
      Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot,
      Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
      Senior Staff Specialist, Cricket Coach
      Microsoft Windows Free Zone - Linux used for all Computing Tasks
      
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