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  1. B

    Urgent help in spectrometer

    2 below.........
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    need help with 3.5mm audio wiring from bluetooth adapter

    Sounds like enamelled copper wire to me. https://en.wikipedia.org/wiki/Magnet_wire#:~:text=Magnet wire or enameled wire,very thin layer of insulation.&text=The wire itself is most,for large transformers and motors. I've seen the above used like this many times.
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    Solar lead acid battery housing

    I disagree. Instructables supporter I take it...??
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    Solar lead acid battery housing

    I'd say it's the worst possible place to house them. I'd be expexting an explosion from a spark or being gassed in my sleep apart from eye irritation and any form of clothing being acid affected. Not only does it give off hydrogen gas but also the charge and discharge create an acid vapour which...
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    PWM that will work with a reversible power supply

    Pots are normally rated at around 1/4w, not suitable, and resistance inclusion also defeats the purpose of using pwm.
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    PWM that will work with a reversible power supply

    No. Pwm control will need to be before reversing switch.
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    I have a device that I need to turn stay on for a period of time when it gets disturbed..

    Some more detail on this secret "device" might be useful.
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    I have a device that I need to turn stay on for a period of time when it gets disturbed..

    If the move is to microcontroller, then an ultra sonic device or again a tilt switch.
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    Designing Schmitt trigger oscillator using CMOS NAND gate.

    Charge the cap first.
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    I have a device that I need to turn stay on for a period of time when it gets disturbed..

    Look for PIR sensor. Many types available to operate on many voltage levels. The only disadvantage there is it will also detect movement around it. If that is the case, use a vibration sensor or a tilt switch. More detail on the application would give a more educated guess. For example, a ball...
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    What component is this?

    the giveaway is the "c" on the pcb, in this instance c22.
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    What component is this?

    No image.....
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    Water tank sensor

    Strange, even for a basic milliamp guage this would be back to front. Is there some reason any link to the unit is a secret..?
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    Hi y'all, need some old school help.

    What is your electronics level of knowledge....ie do you have and know how to use a multimeter ? Multiple posts on the same subject will be frowned upon.
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    Water tank sensor

    Do you have some specs on the new sensor. Link to details...??
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    Water tank sensor

    Arduino promini would measure input through analog as a voltage. A couple of if statements to recognise the analog input levels and output to the appropriate LED's through 4 outputs via series resistors.. I would tend to reduce the 12v down to say 9v through a cheap ($2.00) converter into the...
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    Needing timed spark (Noob)

    555 circuits in astable are simply not suitable. There may be an exception circuit out there somewhere but not known to me. Below is an example what you will be required to reproduce. The time "T" will be your 4 to 5 minutes. The time "t" is the time your coils is energised and then turned...
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    Power Recliner controller

    That's what the minus 2 is.
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    Needing timed spark (Noob)

    Do you know the basics behind how an automotive ignition coil works? I assume for simplicity you are referring to a Kettering system and not CDI. A 555 timer on it's own may not deliver accurate timing over 4 to 5 minutes. How accurate are you talking here?
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    Power Recliner controller

    You don't say how or where you are measuring the dc.
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