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Jabel J-35 Amplifier: What Are Correct Voltages at T10 T11 Transistor E B C?

minde1 5466 6
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  • #1 12364727
    minde1
    Level 9  
    What have voltage to t10 t11 transistor e b c? Sorry I do need upload circuit link. Search this circuit to google, write jabel j-35 mocy in google.
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  • #2 12372019
    Artur k.
    VIP Meritorious for electroda.pl
    Heh... Transistor needs to work about 600mV BE voltage, therefore on base T10 must be 600mV + I*R24, and on base T11 must be V- +600mV -> -40V + 600mV = 39,4V.
    Voltage drop on R24, and R25 depends from quiescent current. Voltage drop often is different between R24 and R25
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  • #3 12374219
    minde1
    Level 9  
    Transistor be open with normal 600mV voltage? What voltage range to transistor base if amplifier have signal.
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  • #4 12374930
    Artur k.
    VIP Meritorious for electroda.pl
    minde1 wrote:
    Wat voltage range to tranzistor base if amplifier have signal

    The same. The BE junction is a diode.
    Look "rys. 4.1.1":
    http://elportal.pl/ea/bipolarne.html

    Bipolar transistor is controlled by current. Voltage drop on BE junction, always will be about 600mV. This follows from the principles of bipolar transistor.
  • #5 12375279
    minde1
    Level 9  
    What is this amplifier, please upload any PCB side photo.
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  • #6 12375406
    Artur k.
    VIP Meritorious for electroda.pl
    I haven't PCB photo, I never built this amplifier, because it's strange construction.
    minde1 wrote:
    What do it this amplifier,

    I don't know, You don't write about problem. You have had a question about voltages, and I had answered them. That's all.
  • #7 12375879
    minde1
    Level 9  
    Maybe this soldering problem, I want to view working PCB.

Topic summary

The discussion revolves around troubleshooting a Jabel J-35 amplifier that is not functioning. The main inquiry focuses on the voltage levels at the T10 and T11 transistors, specifically the base-emitter (BE) voltage, which is typically around 600mV for bipolar transistors. Responses clarify that the base voltage for T10 should be 600mV plus the voltage drop across resistor R24, while for T11, it should be V- plus 600mV. The conversation also touches on the possibility of soldering issues and the need for a PCB photo to better understand the amplifier's construction and potential problems.
Summary generated by the language model.
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