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    Swapping Out Boards, Repairing and the Economics Considerations Involved

    I worked in aviation, where every second counted, so it was "swap a box" and "if in doubt, chuck it out". But I started off in the component overhaul area, so learnt how they worked and failed, and everything was repaired, right down to the smallest electronic or mechanical component. I then...
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    Voltage regulator or not?

    If you are just running a water pump, you could start off with a supply a couple of volts more at the supply end (I would go to 15V), with enough current capacity.
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    Multimeter DIY test leads gauge

    If you are just doing continuity or voltage checks on your car, you could use a piece of flexible mains wire (like an extension cord ), and strip out the separate wires, solder some alligator clips on there, and you're away.
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    Low voltage drop diode

    I am using it for a solar panel. I found some MBR20100CT's locally. This is a 2 diode package, and rated at 20A ,so should do the job.
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    Low voltage drop diode

    Is there a diode which has a lower voltage drop than the standard 0.5v for a silicon unit, but I need something which can handle up to 10 amps. The germanium type were less, but I don't think there were large power ones made, only small signal type.
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    How do you store your test leads?

    I have a piece of aluminium sheet screwed to the top of a head height cabinet, which I have mounted all those odd 4mm panel mount sockets (the ones which you could never find the matching partner for) or the odd coloured ones, to store 4mm plug leads . I store any leads which have alligator...
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    Induction motor short circuit

    Capacitor start motor? Centrifugal start/run switch? more info needed.
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    18650 cell matching

    Thanks, I managed to fangle enough cells to be within 43 mAh , so I will go with these.
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    Does anyone know what this is?

    Mistakes and smoke! Learn from your mistakes, and try to keep the smoke in the circuit.
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    Does anyone know what this is?

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    18650 cell matching

    I have just got a large batch of used 18650's which I have sorted and capacity checked. I want to make a battery pack, 6P / 3S, ( and using a suitable charger,) and would like to know about matching capacities. Is it more important that the series groups , the parallel groups or the whole lot...
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    Newb needing guidance on 3-phase service.

    Have you actually measured the line voltages with respect to neutral? Unbalanced 3 phase voltages would end in damage to equipment, or loss of "smoke".
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    5v PWM signal to hold 12v relay closed (Automotive)

    The propane cut-out is basically a relay which requires a constant ignition pulse to enable a +12VDC output. It has 4 terminals- +12v input, ignition pulse input ( connected to the "points" connection of the distributor), +12V output, and ground. So if there is an ignition signal input, there...
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    5v PWM signal to hold 12v relay closed (Automotive)

    I see you have worked out all the relevant signals and circuitry, but have you considered an easier system like a propane shut-off device? I have fitted many to older cars, they are easy to install and readily available.
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    Dim fluorescent display

    My old (about 35 years) microwave has a multi-digit green fluorescent display, and has been in constant daily use since new. I have just noticed after so many years that the display is hardly readable- I have been using it on the same setting, so never really took much notice of the display. Do...
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    Battery Questions??

    How about limiting the charge current with an external resistor?
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    Battery Questions??

    There are small 5v input charger boards which will do 1 cell available quite cheaply on Ebay, etc. 2/5/10PCS TP4056 5V 1A USB 18650 Lithium Battery Charger Board Protection Module | eBay
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    Little Electronics storage ideas

    Wow! a floor! I haven't seen mine since the mid 80's.
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    Dodge A/C Control

    The board may have a backup battery (usually a button cell) which has died.
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    Seeking advice to connect wires to power source other than twisting wires together

    You could always have a couple of heaters through a switch or plug & socket arrangement so that these supply your "base heat", then have a couple of elements going through a PID controller (which basically supplies power to the element up to the set point temp. then turns it off , then on again...
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