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    Advice on LiFePO4-based SLA battery replacement

    Interesting that you ask for advice then present an argument in support of your opinion.
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    Advice on LiFePO4-based SLA battery replacement

    I think you need to do some reading. First line below is an example. The lithium iron phosphate (LiFePO 4) battery, also called LFP battery (with "LFP" standing for "lithium ferrophosphate"), is a type of rechargeable battery, specifically a lithium-ion battery, which uses LiFePO 4 as a cathode...
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    Anyone can explain three types of LED tube?

    Steve, The ones we use here are similar to your last unit. Starter is replaced by a unit containing a 200 ma fuse. Internal driver in the end of the tube, balast remains as no longer required but pia to have to rewire to remove it as it has no effect.( not required)
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    Diesel tacho circuit

    If you replace the ic symbols with their actual circuit equivalents, it may appear clearer. You answered your own question with the lm2907.
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    Capacitor charging itself?

    I'd suggest you answer using the knowledge you have gained.
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    Advice on LiFePO4-based SLA battery replacement

    Think you will find they are the worst type as far as self igniting, same as was used in the commercial aircraft a few years back if I recall correctly. Don't know where you buy your lead acid batteries from at" several hundred pounds". I use top quality units (380cca) that last on average for...
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    Logic mosfet pwm

    Circuit...? No idea what you mean by "when I touch the connections I get some power".
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    Changing AC plug to battery operated

    To be fair, there is nothing to indicate the Op did not want to transmit to ground.
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    Changing AC plug to battery operated

    How far would you like to go? Have seen at least one that works well at 2klm plus. Now the video is about range testing the actual controller transmitter BUT the camera transmitter operates at the same range.
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    Changing AC plug to battery operated

    In case you are unaware, there are inexpensive miniature camera/transmitter units as used in FPV on quads etc. that may be suitable.
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    Sensor circuit

    Perhaps try the above and if vibration is a problem you could " roll your own" with a magnet and a hall effect such as an Allegro A1120. It is open collector output and will switch close to rail to rail.
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    Breadboard to Perfboard

    There are also boards available with rows of conductor strip where one can cut as required. https://www.ebay.com.au/itm/10x-Stripboard-Veroboard-6-5x14-5cm-uncut-pcb-platine-Single-Side-circuit-board/221812846830?epid=631803089&hash=item33a51370ee:g:EycAAOSwG-1WzciE
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    110v device plugged into 220v socket, but are those electronic components still usable or not?

    :)..............depends which bits.
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    Sensor circuit

    Depends on what the sensor is. Can you elaborate?
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    Attuning Universal Remote to a DVD/VCR device

    The remote and device must match frequencies. Not just one but all used for associated controls. Either get one that suits the device or a universal remote with your model in the list.
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    How to Trigger (on and off) the Battery Wirelessly ?

    So what powers any receiver?
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    Full Wave Rectifier

    Don't fuss over it, just accept it. Wait until you start with transistor theory and the movement of electrons one way or holes in the opposite direction.
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    AC 18650 Replacement?

    That's why I suggested a common 6v supply and use a converter to adjust down to the required level. These converters are readily available and cheap from Ebay. Op would still need to do a current check as Chemelec suggested earlier to ensure any such converter would be of sufficient size...
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    AC 18650 Replacement?

    You could use just about any dc plug pack ( anything over 6v)that can handle maybe 2 amps and add a down converter off Ebay. These usually handle around 2 amp and adjustment for your 3v3 level. I doubt the LED would draw that much current anyhow. As far as any current control or whatever, the...
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    Full Wave Rectifier

    During the first half cycle, current flows upwards in the transformer, through diode D1, through inductor LF and down through load RL, through the ground connection and back through the transformer centre tap. On the second or negative half cycle, current flows down through the transformer...
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