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    Help requested to identify common emitter, collector base bjt circuits

    Try this ...............might shake up the brain cells.... :) https://byjus.com/physics/characteristics-of-a-transistor/
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    Phase current calculation

    Op is using AC where impedance rules.
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    Project help request: Striking a bell manually, alarm clock.

    Don't need a computer.............. simple approach would be an existing clock with alarm function and a pocketful of mod. Other than that an RTC and Arduino (clone would suffice), some kind of battery or power supply, few extra bits and a lot of study (from what I see so far) Try Googling for...
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    electronic Tesla valve (ETV)

    ............. and then there were two. :rolleyes:
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    Can you please tell me how am i supposed to replace these fuses ? They are mounted on the pcb surface and i don't have a hot air station.

    I foresee disaster....... :oops:
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    Newbie... Need help with wiring kids car

    Yes, you will need some form of voltage regulator there BUT................. What is the estimated current draw for the accessories such as lights, and radio etc. If you look on Mouser or one of those online shops (even Ebay or whatever) you'll find plenty of buck converters. Rather inexpensive...
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    Newbie... Need help with wiring kids car

    You said you were replacing that motor with a 24v motor.....what is it you are actually doing now? Apart from that, motors are inherently fairly robust and the 12v motor run on nominal 18v may not be a problem, depends on many things. For example, we used an old Makita 7.2v drill (which had a...
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    Project help request: Striking a bell manually, alarm clock.

    Solenoid would be best choice. Select power (watts) of solenoid , voltage and return spring strength based on trial and error for strike power. A gear motor driving a cam with a spring loaded plunger would also work however, would need to "home" the motor after each operation.
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    short caps of electrolytics fault goes

    Best hang off until one of the audio specialists give you some solid reliable advice.
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    short caps of electrolytics fault goes

    Think you need to visit a theory doctor real quick. Load of hogwash.
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    Newbie... Need help with wiring kids car

    There is nothing to say any 24v motor will run any faster than what you already have. As it stands, you say replace battery with Dewalt 20v unit, which is in a way, advertising hype. There is no difference between the old 18v and this new claimed 20v unit. These units are made up of lithium ion...
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    Solar tracker problem - LED generates variable voltage in the sun picked up by pico ADC

    Think again........... I wouldn't call that shamble tangle of wiring and cardboard cut outs "a lot of work". Then again, it's probably in the eye of the beholder which doesn't say much for the quote.
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    Solar tracker problem - LED generates variable voltage in the sun picked up by pico ADC

    If you must use an LED, use one with a clear lens. Can't make head nor tail out of your meter readings explanation. Good luck with the cardboard, your layout and the Guinness book of records.
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    Solar tracker problem - LED generates variable voltage in the sun picked up by pico ADC

    Why an LED...? Seems to me a photodiode would be more appropriate for several reasons.
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    Electronic door lock is safe?

    If the lock is worth it's salt, it should be fail safe......... i.e. release the door lock mechanism when a fire/smoke is detected. Look at how fire doors in hospitals etc. release automatically without power and close.(fail safe)
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    Check individual cells of a car battery.

    Exactly...invest in one of these load check meters....been around since Adam was a boy. Less than $40....cheap as......AND it will show some useable values.
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    Solder smd

    0.5mm resin core solder and standard old off-the-shelf tin of flux. Flux will go clear and runny when heat applied. 60/40 solder ...... https://www.ebay.com.au/itm/353725397772 flux paste ................. https://www.ebay.com.au/itm/203862725811
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    Very high current power supply

    Sounds like a good way to loose your head or at least suffer severe burns....DC fault currents can cause ionisation which if handled incorrectly , become a problem, real quick.
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    Using AC/AC wall adapter and converting to DC

    The displayed voltage of the plug pack, if shown as 12v is the RMS value.
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    Help needed PE/IR Sensor

    There is no " beam"....pir, passive infra red , detects infra red radiation. If this radiation stops moving, or goes out of range, the unit switches off. The relay associated with this is adjustable for night and day, or night only operation and the units have built in timers which can be set...
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