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    Closed loop stepper motor problem

    Sounds like whatever is controlling the driver is either missing steps, too fast or has internal program unwanted delays.
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    Makita 6500 Heat Gun

    Seems you are trying to get some measurement from pic 09 with a black probe under the thermocouple bulb.....good luck with that. Photo 22 appears as an anti surge device often placed in motors and heaters etc. to limit initial inrush current. In this instance on the heaters common. What...
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    What is this? Radio?

    Possibly a detector of some kind using the front knob as a range switch and the front panel "bulb" being similar to a "tuned to frequency" component. Old valve radios ( pre 2nd world war....I bought one for $5 when I was an apprentice) used simiar to indicate " on station" tuning. A seeing eye...
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    is installing a step down transformer a diy project?

    Not on AC mains.
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    is installing a step down transformer a diy project?

    Mostly it would be ok but as we have no idea just what this "equipment" comprises, what current draw, what tolerances are imposed by the manufacturer, then it's anyones guess. 5% supply variation is a fairly standard supply authority spec. Depending on the country naturally, as example, Thailand...
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    RING LCD torch misbehaving - is it saveable?

    They fail because they are knackered. No they do not require recharge more often however a trip over to batteryuniversity web site will educate you. Pcb components these days are a favourite fail point for those who do not know any better. The cell is still my suspect item btw. Test with load...
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    Makita 6500 Heat Gun

    Thermal fuse most likely the one in pic 040 and 912. Failing that, as I said element blown or failing that, the pcb control for the element is cactus. Note that any test for good must be via meter measurement otherwise you just waste everyones time.
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    RING LCD torch misbehaving - is it saveable?

    Sounds like the battery.....did you test the battery under load of any kind? If not, it will give a false reading.
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    Makita 6500 Heat Gun

    Last time I looked, these sort of things don't take kindly to "twist and tape". There usually is some description of a thermal overload internally but it will usually take the shape of either a bi-metal contact (old days) to a thermal fuse as shown below.
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    Filters Common Mode Ckoke

    The above $20 device will do the lot. Then show values on oled screen. Easy peasy.
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    Makita 6500 Heat Gun

    Sounds a lot like it's blown the element which is an "assembly". Best take it to an authorised Makita repairer for a quote and to repair. Oh, and lesson here is, NEVER lend your tools to ANYONE, relatives and so-called "mates " moreso.
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    Filters Common Mode Ckoke

    Get a component tester, $20.
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    110v AC pulse on/off device

    A 555 multivibrator module such as below. Likely others available on Ebay and the like. If you're concerned with the relay wearing out simply slip in a solid state relay. https://www.phippselectronics.com/product/ne555-frequency-adjustable-pulse-generator-module/...
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    Advice required

    Look at fpv gear for rc work. Cheap and plentiful.
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    Possible to modify LED Christmas tree circuit for dimming?

    No requirement for any uc. As far as the rest, who knows, you have it in your hand not me here.
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    Possible to modify LED Christmas tree circuit for dimming?

    You could try using a small pwm control on the low voltage output to the LEDs .....BUT.....the LEDs might not like the outcome (flickering etc. or too low a voltage for the LEDs to work at all. There are small speed controls about $3 on ebay etc. but they are limited to around 12v in......you...
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    Carbon Composition Resistor or Inductor?

    As before, damaged item (in the instance of a resistor) would be obvious. I'll take an educated view here and say given your apparent inexperience, trying to track errors in the board in question would be well beyond your capability. That said, you could post close-up clear images of both...
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    Best combination for IR controlled UV strip

    Best give some thought to taking up lawn bowls then. Fact of life that certain things cannot physically reduced beyond a set dimension.
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    Carbon Composition Resistor or Inductor?

    I'd go with the component tester. Physically it looks intact so why would you suspect it as "faulty" in the first place? Placement in the circuit would be a dead give-away but an inductor at 10%, (silver) sounds about right on the tester. Testers have tolerance to be taken into account as...
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    Lighting Instrument Bezel

    What meter....?
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