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  • DIY: Squeeze Extra Capacity From Old NiCd Batteries

    But they can ignite their packaging materials. Ask me how I know.I managed to get it outside before black smoke started to pour out of the battery and hot plastic dripped from where the heat from a shorted cell melted through the case.

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  • Hack an old pc power supply into a lab bench power supply

    Make sure that the rotary switch is a "break before make" configuration. Switches used in audio work are often "make before break" to avoid popping noise when the switch is moved from one position to the next.If a "make before break" switch is used it will short the supply Voltages to each other when the switch is rotated. Sparks or damage may be the result.

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  • harvsch commented on ShakeTheFuture's instructable PVC Socket Wrench1 year ago
    PVC Socket Wrench

    I would think of this more as a nut runner rather than as a wrench. I wouldn't try to actually tighten anything with this. PVC has an unfortunate habit of shattering violently when over-stressed. An outer jacket of heat shrink would make it a lot safer to use. Heat shrink with an inner melt-able sealant layer would likely increase it's strength as well.

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  • harvsch commented on RegisHsu's instructable Handy Power Supply1 year ago
    Handy Power Supply

    Nice job, I like your approach. Looks like something I would be likely to do.I see that you have a fan on the back. Hopefully it is trying to blow air out the back and not in. If it is blowing in, it will eventually fill the box with dust.If there is a fan there should be vents somewhere else so that the air has a path both in and out of the box.

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