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    Led Timer Circuit

    Do a bit of reading or watch a few videos on Arduino, the kind of thing it was designed for. Projects such as this are done by primary school kids, not that difficult if you are prepared to do a bit of study. Make an attempt at least to learn and the good people at Arduino will help out if you...
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    12v dc to 10v dc converter

    Enclosure problem can easily be overcome by simply encasing in a piece of heatshrink. Plenty of sizes available at elcheapo cost from Ebay. From memory for tube type they give the size as width = 1/2 circumference. Shrink usually about 2:1.
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    i++ and ++i operator

    x++ gives value then increments ++x increments then gives value
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    12v dc to 10v dc converter

    Use adjustable down converter module. In one end , out the other, adjust required level, finished. Easily handle a couple of amps. $1.00 delivered...
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    How do I use a multimeter?

    When things are dropped, look for anything broken as it is a good sign. I think explaining how a multimeter works is a LITTLE bit taxing on the resources here , especially since your knowledge level is zero. There is ample instruction already out on the internet.
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    Cheapest bank checks?

    Maybe "draw" them.
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    555 timer for a fan

    Turn the power off.
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    Building an analogue wind direction meter

    https://www.instructables.com/id/COMMUTATOR-BASED-DIRECTION-INDICATOR/
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    Solar power 12 volt car windscreen washer pump (Time Adjustable)

    Many types of timer modules available at low cost and reasonable quality on Ebay. Depends on what your requirements are as to which one. As for the pump, I'd be inclined to go for a magnetic drive as there is no shaft seals to breakdown and parts are usually made from a type of carbon plastic...
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    I want to modify my car radio

    Many of these late model radios would have rca out provision but I looked up your model Camry and there is no mention of this in the user instructions. (Has everything short of "taking the dog for a walk though) Not to say they don't exist. RCA out allows for connection of low level signal to...
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    How to turn Smoke alarm into Ultrasonic Dog Repeller

    I don't know........our cat took one look and disappeared for 2 days the last time my burglar alarm went off(same sound) ...last I saw him he was about 300m away taking a look back to see what the hell was that// Guess I should add in fairness, he was in a deep sleep in the middle of the day at...
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    Solar power 12 volt car windscreen washer pump (Time Adjustable)

    I doubt that particular pump will give much service life even considering it is of VW origin. That plus the type of impurities would give the motor a real hard time considering they are made for fresh clean water. Simple fact is, although in their designed environment they may last for 10 years...
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    Solar panel spotlight. Are these the right components?

    1. Does the size of the panel support the length of time you wish to run LED with some reserve? 2. Does the charging board have some form of converter to allow the lower voltage to charge the 2 LiPo's? 3. Do the LiPo's have protection circuits built in. (some do...I will post a link at the...
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    Power supply from china

    Probably works ok as most stuff from China does. All comes down to the application really. i.e. if you are into operations with NASA, probably not. I use Topward as for 1 they were available at the time and 2, they have back up in the way of maintenance info etc. I would say most pc supplies...
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    I want to modify my car radio

    Output too high for headphones, unless you want to make your own headphones out of a piece of bent spring steel and a couple of 8"x 6" speakers. :) If it has aux out socket on the radio just jump into a bluetooth wireless headphones and adaptor. Anyhow, these line to rca level converters might...
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    VU meter

    Complete meter and pcb kit on Ebay.....just for general information...:) https://www.ebay.com.au/itm/2pcs-VU-Meter-500UA-Warm-Back-Light-Recording-Audio-Level-Amp-w-Driver-Board-Hot/232525297829?epid=26007291532&hash=item36239678a5:g:3x8AAOSwzj9Z5Ex1
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    Replace 6 AA with 9v 1~2 amp DC adapter

    Yes, looks like an extra black wire in the "90" photo above.
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    LED ON / OFF by Magnet

    Latching hall effect switch....just have to apply one pole at turn on, opposite pole at turn off. In my experience with hall effect I find using 3mm diameter x 1mm thick rare earth magnets sufficient. Most work in the range of 3 to 30 odd volts. Just watch unusual connections.......output open...
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    Replace 6 AA with 9v 1~2 amp DC adapter

    Reverse connection...?? AC adaptor instead of DC...?? Anybody's guess....you have it in front of you but it's impossible for us to see from here.
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    555 timer for a fan

    Transistor is fine to use but as you've found, bit of fiddling to get it right. If you simply use a 2n7000 mosfet, put a 220r resistor from pin 3 to the mosfet gate and a 10k from gate to ground. Motor goes Drain to positive rail and Source to ground. Bump up the 555 supply to 6v and you should...
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