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    Tachometer from 1984 Nissan 720

    Rarely, if ever , do vehicle manufacturers give detailed information on their guages. Bin it and start again. Plenty of info out in the web for diy tachos.
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    Preamp/amp for tiny electret condenser mic

    These also............. https://www.ebay.com.au/itm/154542862641
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    PYE P28 radiogram no sound

    Note that valve sockets can get grubby as well requiring similar treatment as the pots with crc.
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    PYE P28 radiogram no sound

    With power off, give the volume and any tone or bass controls a good squirt of crc in where the termals exit as you rotate the knobs. Could be twin pots depending on whether mono or stereo system. Check all electrolytic capacitors for signs of bulging or leakage. Firther checks will require...
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    What more i can do?

    IC's simply just do not throw in the towel by sitting around for 30 years. Batteries, contacts, electrolytic caps and dare I say it, fiddling, do.
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    What more i can do?

    So then.......what is it????? Beeping at power up is usually bios problems, perhaps just a bios battery gone down and needs replacing and date reset. Or could be memory spaces empty/knackered/incompatible. Tip...when you post photos, post them in correct orientation so others here don't have...
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    Intercom door entry wiring - with Ring - what to do

    So.....ask your friend to help you if they are now familiar with it.
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    240 single to 380 3ph

    I'd knock English off those 3. Point being, if you cannot communicate your problem, no one here can help you.
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    240 single to 380 3ph

    This makes zero sense either.
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    240 single to 380 3ph

    My first reaction is, if you want a Ferarri then buy a Ferrari. Other than that your question makes no sense for those of us who grew up with the Queen's English.
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    Is there anyway this circuit could be improved?

    What is lamp wattage??
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    What can I use instead of a 27R resistor?

    100R 10 turn....or standard pcb mount pot......adjust where ever you like.
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    help with IR2110 chips

    Auto route, click on whichever trace, and edit.
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    kitchenaid microwave

    You apparently have zero knowledge on microwaves. Suggest you take it to a repair agent who does. Microwaves can be very dangerous when you have no idea on what is what.
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    Wire splice terminals ferrule crimp connectors - soft metal issue

    Junk crimp links. Bin them and buy some decent ones.
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    Van De Graaff Generator

    I doubt you'll get anything out of that motor as it would be a fractional hp split phase motor, not suitable at all as a generator. Oh, I see, you want this as the drive motor. Again not suitable, low torque. Not enough oomph. Use an old drill.
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    555 circuit to open/close car door window

    No it does not.
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    555 circuit to open/close car door window

    Yes it is.
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    555 circuit to open/close car door window

    One has to ask is this an "add-on" modification to the vehicle as standard fitment would have all the necessary equipment such as limits and switching already in place.
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    Basic circuit, but is this possible??

    I'll have to take your word for it although it would be the decent thing to point to exactly what you refer to without having to troll through 50 items in your link. There still remains the effect the internal resistance , depending on button cell type, on the transfer of charge to any cap...
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