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    Sansui TDC2075A (CRT TV) has no power or standby lights.

    I was referring to the power supply, not the tube.
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    And now something weird

    Low end escort.......:)
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    Problem with reverse voltage on old truck dashboard

    Can only be feedback somewhere in the complete circuit (which is not shown). If one has a sensor connected only to ground.............. (has really to have something else connected there as well, circuits need two ends to work) ...................and you measure voltage across that sensor, then...
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    When does a fuse or circuit breaker blow

    100Ah is not the amperage either.........:rolleyes:
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    Diagnosing bad motor

    Check for dead relay...just about everything in autos is under relay control, especially motors.
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    What is this...no markings

    Look for a circuit break or dry joint. No "narkings" ...nah , most here tend to give you a bit of leeway initially...:D
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    Sansui TDC2075A (CRT TV) has no power or standby lights.

    No standby LED says standby power is down. This is normally the 5v power required to get everything up and going. Some knowledge of switchmode prower supplies is required to be able to trace just where the problem lies. If you want to try to fix yourself, without a circuit diagram for that...
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    Problem with reverse voltage on old truck dashboard

    Nope, makes no difference, still about as clear as mud. Firstly you didn't answer the questions I put to you in the first paragraph. I don't get the connection between this master on off and your sensor/multimeter. Also just what is the multimeter measuring and how. Draw a complete diagram of...
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    Problem with reverse voltage on old truck dashboard

    Can't follow what you are trying to do. Are you measureing resistance with voltage (master relay) on...??? Or are you measuring millivolts with the master relay both ON and OFF. You have shown resistance and millivolts..... ?????? Is the square at the lower part some kind of sensor and is top...
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    Problem with reverse voltage on old truck dashboard

    Draw a diagram of what you have. Include any power supply you are using. At the outset when using millivolts as input to Arduino you might need to use instrument amplifier and mapping for the Arduino to successfully recognise any changes. Code you have written will also affect the outcome...
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    When does a fuse or circuit breaker blow

    Stupid thing to do to begin with.......
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    Using a Mosfet to limit current to a high power Cree LED, Can't go higher than 400mAh??

    Draw a circuit of what you have and include whatever power supply/battery you are using. Also spec details on the Cree LED
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    Controlling lights, fans and pumps in hydroponics

    Once again, commenting on subject where the OP left the discussion ages ago. However, for your benefit as it appears you cannot understand the Queen's English, the Op called for (in the first sentence) "without spending an arm and a leg".
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    Circuit selector

    Regardless, the same applies.
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    Need help identifying a component

    Either a thermocouple or a thermistor or heater element. Details on how to test which is which and if thermistor, what type on the internet. Most likely even a number stamped on the body of it somewhere which would identify it.
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    Circuit selector

    So, they are still around plus or minus 1%....unless you are making a special order request. Most are satisfied with a rotary switch and metal oxide standard resistor. Any addition circuit will only add tolerance variations I'm sure. Apart from that, any precision ohm meter would be a constant...
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    Sensor plug through wall

    Only thing i can think of would be an epoxy filled gland plate. Even if filled with say a re-enterable gel epoxy it would still be subject to breakdown and leakage of some description over time. We used to use a dow corning re-enterable gel yonks ago but that was mainly for periodic flood...
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    Correct my errors as I make them, if u please

    Fruit cake......
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    Can't find a PCB designer to hire for cool position. Is PCB design completely ignored in schools?

    A 10 year old can design pcb's these days given the online facilities. One doesn't need some EE graduate whatever that is. I'd say you are looking in the wrong places. Someone with a passion for it might be reading here so that's a start. Other consideration is "what are you prepared to pay for...
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    Compatible Polyester Capacitor

    I'd say it's 2.2uF with 5% tolerance(J) 250v The A4 no idea Capacitor legs, as with other discrete devices don't just "fall out". Your photo is blurry and doesn't really show all that much except the value.
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