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    Electronic timer clock

    Lastly,( many other ways also BUT) using your clock and a standard stop/start circuit and a relay with a microswitch on the "in" gate as the stop switch. Note:-.....Microswitch could also be replaced by the previously mentioned IR relay contacts.
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    Electronic timer clock

    This ir unit has a digital ( 5v ) output signal, which a resistor, small transistor and a relay could be added to give the desired "no volt output contacts" required to interface with whatever timer arrangement...
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    Electronic timer clock

    I once modded a dick smith kitchen timer to monitor discharge time of nicad flight packs. Connected a set of small relay contacts across the stop button. Operation was, set timer to count up, set to zero time, start the discharger, then start the count up timer. At the end of the discharge...
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    555 flasher isnt flashing

    That is why you were getting weird readings as your negative to the chip and other components was non-existent to some extent. Also, as a side note, when using a potentiometer to vary timings, it is a good idea to include a "minimum" value fixed resistor in series with the pot to eliminate...
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    External charger for mobile phone batteries

    It's in the videos I linked to.
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    External charger for mobile phone batteries

    First is the one I referred to....details are further down the Ebay page https://www.ebay.com.au/itm/LM2596-DC-DC-Step-down-Adjustable-CC-CV-Power-Supply-Module-Converter-LED-Driver/123288297784?ssPageName=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649 There is also one i remember I used to build...
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    External charger for mobile phone batteries

    Only have my phone at the momentbut will send details a bit later.
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    External charger for mobile phone batteries

    Lithium charger modules available from Ebay for around $3.00. Run on a wide range of input voltages and 3 pot adjustment facility for max voltage, max current and trip level( latter usually does not need adjustment) How are you with basic electronics, have a multimeter??? Difficult part might be...
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    Drone propellor not spinning. motor fine. no voltage

    Wouldn't hold my breath. Have you see "expensive" ones that are waterproof?? Have a link perhaps??
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    Delay Relay

    I don't see why. Simple, cheap and if design changes, mods can be done in a flash( so to speak)
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    3 transistor non-contact mains detector

    Well, the whole idea is for adapting to a uC .......poo poo it if you like but I thought it was a good idea.
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    Running house LED lights on AC

    These fire proof cardboard style boxes with the fireproof sealer were used in Australia for maybe 2 or 3 years on the dichoric range of downlights which were a really bad fire hazard. Another twist was to use a rolled gal metal tube around 300mm high with an open end at the top. Whole idea was...
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    3 transistor non-contact mains detector

    Saw this video the other day while stooging around looking for something completely different (which happens many times). Many times see people looking for ways to detect when a device is powered up and to operate other low voltage or whatever equipment. Seemed a brilliant idea to me at least....
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    Drone propellor not spinning. motor fine. no voltage

    Next time it might be a good move to get a "waterproof" drone. Saw at Banggod the other day, a quad that is almost indestructable. Dump it completely under water, no problem, jump on it, no problem, cut off one side of each prop , no problem, unit still flies. Unbelievable and all up cost of...
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    Delay Relay

    So the machine or whatever this international secret device is, is currently shutting down perhaps by a stop button. Now you require this ( for example) stop button to be pressed but the machine to continue running for an added 30 seconds or an adjustable amount. A microcontroller instantly...
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    Laptop lid sensor...

    Most I've ever had just requires a push pf the power button to do same thing as close the lid.
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    Running house LED lights on AC

    Dollar for dollar, I think you'll find a scan around any ic motor vehicle is a million times worse.
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    Laptop lid sensor...

    Who says it has to be magnetic or that the switch is actually operational or some other fault? I would tend to open it up and take a peek.
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    Sensor to activate a handicap door switch

    No battery........wall unit is active component and is mains powered.
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    Laptop lid sensor...

    Page 7 and 8 item 5 in your service guide you linked to.
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