2K res to ground

Discussion in 'General Electronics Chat' started by DexterMccoy, Mar 14, 2014.

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  1. DexterMccoy

    Thread Starter New Member

    Feb 19, 2014
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    Is using a 2k ohm resistor to ground , to short output the inputs of Op amps ok to do when troubleshooting?

    The 2K ohm resistor is used to protect and to limit the "In rush current" when doing a short to ground

    Is 2K ohms enough for the in rush current and to protect when shorting out Nodes or junctions in a circuit? shorting out inputs to transistors and op amps?
     
  2. DexterMccoy

    Thread Starter New Member

    Feb 19, 2014
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    The outputs in Idle mode when there is No input signal should be at 0.030 VDC , this is millivolts

    What I am getting is 0.060 , 0.080 vdc

    How can I find this type of problem , because I'm troubleshooting millivolts when their is no input signal, when the transistors and op amp is in idle mode

    How would you guys try to troubleshoot when the voltages are in millivolts when there is no input signals , the transistors and Op amps are in idle mode which means no input signal

    It's the DC voltages and noise it's on the outputs of transistors and op amps

    Here is the schematics
     
  3. DexterMccoy

    Thread Starter New Member

    Feb 19, 2014
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    another schematic
     
  4. DexterMccoy

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    Feb 19, 2014
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    What is it called when the transistors and op amps have No input signal but the outputs of the transistors and op amps output millivolts voltages?
     
  5. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    Input offset voltage?

    A bad design?

    A ...?
     
  6. shteii01

    AAC Fanatic!

    Feb 19, 2010
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    Offset or noise.

    If it is flat voltage, I would say offset.
     
  7. DexterMccoy

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    Feb 19, 2014
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    But can I use a jumper wire with a 2k ohm resistor to ground to short out the inputs to transistors and op amps? Is this safe?
     
  8. shteii01

    AAC Fanatic!

    Feb 19, 2010
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    Depends on application.
     
  9. DexterMccoy

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    Feb 19, 2014
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    Depends on what? The current and voltage rating? Is 2K safe or shouldI use 1meg ?
     
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