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    'Letraset' type dry transfers for PCB pads chemical etch resist

    How about the old Dalo pen ? (if they are still made). I reckon I drew several hundred miles of tracks with these things.
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    Seeking advice to connect wires to power source other than twisting wires together

    Each of your elements will draw a little over 4 amps if supplied with 12 volts. Why not just have a bank of switches which can be used to turn on as many elements as required. You could get real temperature control by using a PID controller (available cheaply on Ebay, etc,), you just have to...
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    VFD voltage

    Inside the hoist housing (original location).
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    VFD voltage

    Physical distance. The VFD is driving an overhead hoist, and the original transformer is mounted in the hoist itself, and was originally a 2 X 220v primary unit, connected to 1 phase of a 440 volt 3phase supply. I ended up running a separate 230V single phase supply to the transformer. The VFD...
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    VFD voltage

    I have a VFD driving a 3 phase motor (220V). The setup works fine, but I decided I need to run a small 24volt transformer to operate the switchgear. I thought I may be able to connect the primary of the transformer across 1 phase of the VFD output, but when measuring the AC voltage across 1...
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    Single phase motor - wiring questions

    This may be a dumb answer, but is there any diagram under the cover for the wiring? There usually is. If the supplier has sent you this to cover a warranty issue, he really should sort this out for you. Good luck with it!
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    Lead-acid charger

    Just tried it on a car battery, voltage dropped to 15v under load, which should be OK. I measured another couple of chargers under load, and they both came up to around 14volts.
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    Lead-acid charger

    I just tried the open -circuit voltage of my good chargers, and they are all around 14 volts, that's why I thought the 20v was a bit high. The open circuit voltage of the 24volt section is about 40V.! This charger is (going by what was left of the ammeter) good for 15 amps, and has no regulation...
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    Lead-acid charger

    I have a lead acid (car type) battery charger given to me to repair. I found that it had been subjected to a high load on the output, which cooked the ammeter and permanently open circuited the bi-metal overload protector. I measured the output before this mess, and on the 12volt setting, I am...
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    18650 charging

    Thanks, that was a good article exposing the "black magic" about charging these cells!
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    18650 charging

    I have found a cordless vacuum cleaner which had no plugpack/power supply. It has a battery pack of 18650's, 29.5v worth, and the charging "smarts" are all in the battery pack, so there is only a D.C. input jack on the side. I have set up another bunch of 18650's in series, with an ammeter and...
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    kitchen gadgets buy

    Maybe a microwave that does the shopping, cooking, and then cleans up afterwards? Let me know, I want one too!
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    Micro USB cable

    I am looking for a micro USB plug lead which has a way to connect to the wires, like a "breakout box". I could just chop the end off an existing usb lead, but the tiny conductors are a little fiddly to terminate.
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    Please Identify

    Test with a meter- a capacitor will show up as an open circuit, a rectifier (if working) will only conduct one way. If they are selenium rectifiers (I have only ever seen them in "stacks" with a screw through the middle), Then a normal silicon diode of the correct rating can be used.
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    MOV protection

    When an MOV is exposed to an over-voltage (fault condition), do they normally fail to an open or short circuit?
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    connector; type name?

    Commonly used in automotive applications.
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    Momentary switch to swap between 2 loads and off

    Can you use a spdt centre off spring return (momentary) toggle switch?
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    Has a PCB Been Powered?

    Most (if not all) control boards are sold with a strict "no returns" policy, although I have returned dead new boards to suppliers who knew me and sold me hundreds of good boards and other appliance spares. The supplier has no way of knowing if boards have been installed correctly, and have...
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    Power Supply Leads question

    As said above, widen the slot until it fits snugly. Just be real careful doing it, as it does not take much to snap off one or more of the "quarters" on those old plugs. I think they were chromed brass, so very brittle.
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    Mico soldering irons

    I reckon I still have one of these, it was gold coloured, and I had it set up to use while working on cars with a cigarette lighter plug. I remember making a stand for it which had a microswitch and a resistor so when it was put down on the stand, it would only get around 6 volts through the...
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