Osc powersupply

Discussion in 'General Electronics Chat' started by DexterMccoy, Mar 11, 2014.

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  1. DexterMccoy

    Thread Starter New Member

    Feb 19, 2014
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    When a DC power supplies current meter is oscillating back and forth , what does this mean?

    The current meter is an analog meter with a needle , but the needle is moving back and forth

    Is the power supply oscillating? from being over drawn?

    Does this only happen to linear power supplies and not switching power supplies?

    The circuit board has a DC switch to turn on the DC power supply, and also a second switch for the AC 115volts.

    The power supply current meter doesn't oscillate or needling swinging if the AC switch is OFF. Only when the AC switch is turns ON , the DC powers supply current meter needle starts to swing and oscillate, why is that?
     
  2. ScottWang

    Moderator

    Aug 23, 2012
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    No picture and no circuit.
    I just guess that does the filter capacitor lost the function?
     
  3. LvW

    Active Member

    Jun 13, 2013
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    Another question: Which kind of circuit is connected to the supply?
     
  4. DexterMccoy

    Thread Starter New Member

    Feb 19, 2014
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    Have you ever seen the current meters needle moving and swinging when hooking it up to circuits? what causes this type of problem?
     
  5. LvW

    Active Member

    Jun 13, 2013
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    Perhaps it is the connected circuit which is oscillating?
    Therefore my question above.
     
  6. DexterMccoy

    Thread Starter New Member

    Feb 19, 2014
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    The Timer circuit, clock circuit , pulse generator circuit is causing the the current meter needle to fluctuate or oscillate every time a pulse is turned on and off

    What is wrong with the circuit?

    Some how the clock circuit or pulse generator circuit is feedback into the power supply?
     
  7. ScottWang

    Moderator

    Aug 23, 2012
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    Maybe you can draw all the circuits connections with block and labeling the Vcc and gnd, and you have to make sure that where is the oscillation came from, you just testing one by one.
     
  8. DexterMccoy

    Thread Starter New Member

    Feb 19, 2014
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    I disconnected the Pulse generator, and it fixed the problem of the Power supplies current meters needle from fluctuating and oscillating

    How can the pulse or clock signal make the power supplies current meter's needle fluctuate and oscillate?

    Is the pulse generator or clock signal not isolated or the grounds not isolated or how is it getting feedback to the power supplies current meter that it's making the needle fluctuate and oscillate?
     
  9. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    The meter simply shows the current that is being drawn from the supply.

    So if the meter is moving, it means something you connected to the supply is drawing current in pulses. Or is drawing more current some times, and less current other times. :)
     
  10. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Pulse generator is having problems.
     
  11. gerty

    AAC Fanatic!

    Aug 30, 2007
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    Your power supply is only capable of sourcing 10 ma. And your load is 5 amps, there's your problem.
    You refuse to answer questions, so we can only guess at what you have. How can you expect help when you won't tell us what you have for a power supply, or what load may or may not be connected to "pulse generator"..
    Your turn :eek:
     
    shortbus likes this.
  12. DexterMccoy

    Thread Starter New Member

    Feb 19, 2014
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    Yes the power supply is drawing current in pulses, but what is causing this kind of problem? it's the pulse generator that is doing this , but what is wrong with the pulse generator?

    Is it a pulse generator grounding issue? a pulse generator loading problem?

    Why is the pulse generator drawing current in pulses?

    What kind of loads can the pulse generator be connected to? or what kind of loads do you mean?
     
  13. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Show us your PSU and pulse generator.
    Need the PSU specification and ur pulse diagram schematic.

    Other wise we cannot solve ur problem
     
  14. DexterMccoy

    Thread Starter New Member

    Feb 19, 2014
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    I will get that info today and upload

    So you think because it is a linear power supply and not a switching power supply this is why the power supply is drawing current in pulses?
     
  15. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Nope..! I do not think so.

    Meter is pulsing cause the pulser is drawing current. Without a load ur pulser might be the issue
     
  16. Billy Mayo

    New Member

    Mar 24, 2013
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    Yes I think the pulse generator has no load, why would no load on the pulse generator cause this problem?
     
  17. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Like I said, OP made a mistake on the pulsing thingy.
     
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