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  • How to Measure AC Voltage Using Multimeter

    it has also been suggested that you apply the probes to the work piece black (common) first then red, and remove them red, then black. Think: "Black first on , last off"

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  • swander commented on Hashem_Mehyar's instructable DIY Cassette Deck Drive Belts2 months ago
    DIY Cassette Deck Drive Belts

    rubber bands work too, (although not in the case of long car audio belt apps) but they are too stretchy to provide a rock solid wow and flutter ratio (warble) but they do work to determine of the deck is salvageable. They often break after a few months of sitting though. Once you get it to work with a rubber band, you can use the string method to determine what size belt you REALLY need. string up your belt path tight with a single strand and cut where they overlap. Measure the total length, deduct 10% to compensate for stretch and go online or to a electronics store and buy a generic replacement belt. Usually about $5. Old belts slip, even if they look good from a visual standpoint, they get stretched and due to their low elastic design, cannot recover to provide the proper torque to t...see more »rubber bands work too, (although not in the case of long car audio belt apps) but they are too stretchy to provide a rock solid wow and flutter ratio (warble) but they do work to determine of the deck is salvageable. They often break after a few months of sitting though. Once you get it to work with a rubber band, you can use the string method to determine what size belt you REALLY need. string up your belt path tight with a single strand and cut where they overlap. Measure the total length, deduct 10% to compensate for stretch and go online or to a electronics store and buy a generic replacement belt. Usually about $5. Old belts slip, even if they look good from a visual standpoint, they get stretched and due to their low elastic design, cannot recover to provide the proper torque to the drive wheels.

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  • Making A Fridge Compressor Into A Vacuum Pump

    ISO 10 is the usual oil in consumer refrigerators and the pump i pulled from a 14 foot kitchen fridge (already cut by scrapper for coils) had a stroke of 4.99 cm3. You can look up all sorts of specs by google the pump number. Mine was an EMY-60HER. Sure R134a is bad for environment, but i think its the same stuff that is in duster cans or air horns. I think it is not regulated when used outside the HVAC biz?

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  • swander commented on Lorddrake's instructable Rare Earth Magnets From Old Hard Drives5 months ago
    Rare Earth Magnets From Old Hard Drives

    I believe the one failsafe taped screw is somewhat standardized to eliminate the chance the drive vibrating ALL the screws loose and coming apart in a computer. 10K rpm drives open in a case and then breaking is not good news for anyone.

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  • The simplest FM transmitter... Without coil/inductor

    Remember, in the US, FM offset is odd numbers so some electronic tuners wont be able to find an even frequency such as 93.2. Im sure a variable could be used to tune it to a vacant frequency.

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