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papaof2

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7CommentsGeorgia, USA

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  • 3D Printing Obsolete Vehicle Electrical Connectors

    Several years ago, I wrote some "End of Civilization As We Know It" fiction and had the protagonist 3D printing (with ABS) a new distributor rotor for an 80 year old tractor. He used a 3D scanner for the external size and shape but accurate measurements have been a machinist's best friend for centuries. Nice to know that my fictional vehicle repair has a basis in reality ;-)

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  • Slide Out Refrigerator Cabinet

    You are correct about the heat but it comes from the condenser coil as the compressor compress and cools the gas to get it back to a liquid. Some heat also comes from the running of the compressor. However, any fridge or freezer with automatic defrost has a heating element to defrost the evaporator. So yes, the fridge does have a heating element and that's just more heat the compressor has to remove when it starts back up after the defrost cycle.

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  • Slide Out Refrigerator Cabinet

    First, check the fridge manual for the MINIMUM CLEARANCE around your fridge. Most have something on the order of 2 to 3 inches (50-75mm) on some surfaces. If your fridge has a side clearance minimum, then do NOT encroach on that space. Same for upright freezers.

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  • papaof2 commented on scooter76's instructable A Frame Cabin/Club House

    Download NOT working at 14:23 EDT.

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  • Bad design. The heatsink on the ZVS driver needs air flow to cool it - that's why it has fins. This design may work in the short term but it WILL overheat and either shutdown (if the driver has overheat protection) or die (without overheat protection). You can have electrical isolation and cooling by drilling holes in the case (or cutting one large hole and covering it with a fan grille) to allow airflow and adding a fan to keep the air moving. Size (diameter) and capacity (CFM) of the fan depend on the the power level and how long the inductive heater is used at a given power level. At a minimum, the holes for airflow need to match the physical size of the heatsink and the hole for the fan needs to match the fan's diameter. The airflow needs to be over and parallel to the fins of t…

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    Bad design. The heatsink on the ZVS driver needs air flow to cool it - that's why it has fins. This design may work in the short term but it WILL overheat and either shutdown (if the driver has overheat protection) or die (without overheat protection). You can have electrical isolation and cooling by drilling holes in the case (or cutting one large hole and covering it with a fan grille) to allow airflow and adding a fan to keep the air moving. Size (diameter) and capacity (CFM) of the fan depend on the the power level and how long the inductive heater is used at a given power level. At a minimum, the holes for airflow need to match the physical size of the heatsink and the hole for the fan needs to match the fan's diameter. The airflow needs to be over and parallel to the fins of the heat sink.

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  • papaof2 commented on randofo's instructable Component Creatures

    I made those more than 30 years ago, but the chips were active and the LEDs flashed. Use an LM3909 flasher chip and the life of a battery approaches its shelf life.

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