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  • DavidN71 commented on DavidN71's instructable CDV-700 Maintenance5 weeks ago
    CDV-700 Maintenance

    Yes, that seems to be one that is still made. 50c each in small quantities.https://www.allelectronics.com/item/r6000/0.2-amp-6000-v-rectifier/1.html

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  • DavidN71 commented on DavidN71's instructable CDV-700 Maintenance5 weeks ago
    CDV-700 Maintenance

    I avoid working on Anton's unless they are broke. They are much more complicated than ENi's and Lionel's. When replacing a capacitor that is known bad the voltage matters, as does the capacitance and whether the cap is polarized. Like you said, I don't know of a mylar cap with that rating. Maybe someone tried a fix and it didn't work. https://www.ebay.com/sch/i.html?_nkw=high%20voltage%20ceramic%20caps eBay is a pretty good place to start. The blue caps are not mylar, they are ceramic. Buy at least 2kv, 3kv is better. The current rating system is the actual voltage the cap will fail, the old system when things were made in the US was more lenient.

    You don't make a corotron replacement. You measure the unregulated voltage and then add zener backwards and check again. If the CDV works and the voltage is below 930v then you are probably safe. I have one ENi that works fine at 880v. Using zeners backwards to drop voltage is an art. They were not rated to do that, but will if the current is kept low enough. CDV's can't push much current so that works well.

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  • DavidN71 commented on DavidN71's instructable CDV-700 Maintenance4 months ago
    CDV-700 Maintenance

    It's a 1N34 and it's obsolete. It's was a germanium diode. That matters. The forward voltage is lower on germanium than silicon. The 1N34a is the modern replacement or use a 1N270. Just make sure you are getting a germanium diode. eBay has both in germanium. They are commonly used in fuzz boxes for guitar effects.

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  • DavidN71 commented on DavidN71's instructable CDV-700 Maintenance5 months ago
    CDV-700 Maintenance

    300v zeners have become almost impossible to find. Lately I have been forced to use 200 and 100v zeners.https://www.ebay.com/itm/1N5388B-200V-5W-ZENER-DIO...200v OnSemi brand 1N5388B 200v zeners for cheap.

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  • DavidN71's instructable Replacing Swelled MacBookPro Battery's weekly stats: 7 months ago
    • Replacing Swelled MacBookPro Battery
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  • 3.2v Lithium AA Instead of 2 Alkaline AA Cells

    It worked with my Canon camera. One lipo and one dummy cell = 3.2v. An older camera like the 120sx was made to operate on alkaline cells. I got rid on my 120sx because it was so unstable with 2 cells. I now own a Kodak AZ401 that uses 4 alkaline cells and it runs great. Modern cameras are just too power hungry to get by with 2 AA cells.The run time isn't as long with lipos though. Nicads have an even lower voltage than alkaline cells. I avoid them. Nicads are toxic, too. Nickel metal hydride cells usually work if Nicads will and don't have the toxic cadmium in them.If the camera is voltage sensitive, and most are, the 2 nicads fully charged is 2.9v. Under load the 2 nicads will drop to 2.4v but the camera will complain that the batteries are low when the batteries drop below 2.8v. The l...

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    It worked with my Canon camera. One lipo and one dummy cell = 3.2v. An older camera like the 120sx was made to operate on alkaline cells. I got rid on my 120sx because it was so unstable with 2 cells. I now own a Kodak AZ401 that uses 4 alkaline cells and it runs great. Modern cameras are just too power hungry to get by with 2 AA cells.The run time isn't as long with lipos though. Nicads have an even lower voltage than alkaline cells. I avoid them. Nicads are toxic, too. Nickel metal hydride cells usually work if Nicads will and don't have the toxic cadmium in them.If the camera is voltage sensitive, and most are, the 2 nicads fully charged is 2.9v. Under load the 2 nicads will drop to 2.4v but the camera will complain that the batteries are low when the batteries drop below 2.8v. The lithium iron phosphate cell is 3.2v fully charged. The absolute bottom discharge voltage is 2.5v, but the current output will be so low long before then that the camera will shut off.

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  • DavidN71's instructable Fix Plastic Tool Cases With or Without Tools's weekly stats: 9 months ago
    • Fix Plastic Tool Cases With or Without Tools
      134 views
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      0 comments
  • DavidN71's instructable Power Craftsman Battery Saw From Car's weekly stats: 10 months ago
    • Power Craftsman Battery Saw From Car
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  • Lithium Upgrade to 18v Black and Decker Single Source Battery Pack

    I wouldn't put 28v through an 18v motor unless I had a couple of spares just in case it burned up the motor.

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  • Lithium Upgrade to 18v Black and Decker Single Source Battery Pack

    No reason, except that lithium cells are cheap and with 6 cells you get longer run time and don't need to change the charger except to add a couple of diodes. If the cost of the cell matters that much, then you could certainly do that. The tool won't care much.

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  • Lithium Upgrade to 18v Black and Decker Single Source Battery Pack

    It's in one of the pictures. I cropped it below. The rectifiers are under the black shrink wrap.

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  • Disassembling a 20v Scott's Sync Battery

    I was in a super Walmart today and saw for $50US a Black and Decker cordless drill, 2 20v lithium batteries and a charger. The batteries look almost identical from the outside to these Scotts.12020a's. But, since this is B&D, the cells are probably rejects from somewhere. They should still work in a drill, though. Drills don't pull obscene amps like weed whackers and leaf blowers and circular saws.

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  • DavidN71's instructable Disassembling a 20v Scott's Sync Battery's weekly stats: 1 year ago
    • Disassembling a 20v Scott's Sync Battery
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      4 comments
  • DavidN71 commented on infinitiy's instructable Fix a 400W Fog Machine Pump1 year ago
    Fix a 400W Fog Machine Pump

    Thanks, our church has one for plays. The fog solution is organic and the safe version of glycol antifreeze, so it does caramalize eventually. The fog and cleaning solutions are sold separate from the machine and someone didn't read the instructions and clean out the machine before storing it away. Once I followed your instructions the pump works again. If you can't hear the pump, it's stuck. Otherwise it makes a clearly audible clicking sound. Thanks again.

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  • DavidN71 commented on DavidN71's instructable CDV-700 Maintenance1 year ago
    CDV-700 Maintenance

    You don't need to. Just take a thin strand of bright copper wire and wrap it between pins 2 and 3 if you are not sure. You do not need to solder it, just wrap it and put the tube in the socket as you would normally.

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  • DavidN71's instructable Water Your Lawn in a Hurry's weekly stats: 1 year ago
    • Water Your Lawn in a Hurry
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      3 comments
  • DavidN71 commented on DavidN71's instructable Water Your Lawn in a Hurry1 year ago
    Water Your Lawn in a Hurry

    The white PVC connectors in between the tee and the 2 gate valves are there to make disassembly easier. The pump head was reused when the original pump burned out years ago and was replaced by the one pictured now.

    The pump is a standard 1 1/2 HP [120v/240v] irrigation pump from Home Depot.The pump head output is 1 1/2", which is the same as the fire hose.I unscrewed the 1 1/2" output pipe and replaced it with a 1 1/2" tee. The NPT to NST adapter screws into the tee and the hose into that.The nozzle screws on the fire hose just like a garden hose nozzle does.No tools needed except a pipe wrench. The picture of the pump shows the connection there.

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  • Lithium Upgrade to 18v Black and Decker Single Source Battery Pack

    Thanks. I avoid cordless tools except where I don't have an easy choice. It seems batteries are expensive and don't last very long. My parents used to live on a boat, so there were many times safety came first even though they had more onboard 120v power away from the dock than most houses. I put a vacuum cleaner cord on a Makita drill once and ran it from my car battery. The on-board battery could not be swapped out. When it ran dead I had to wait for a recharge.

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  • Lithium upgrade to 18v Black and Decker Single Source battery pack

    The cheap cells I bought don't do well on a weed wacker, but they aren't soldered in, so they can be swapped out for better if I wanted. I still have a couple of cheap nicad packs and between all 5 I can do what needs to be done. The cheap cells were like $1 each so I didn't expect miracles. I have bought completed packs from HobbyKing and they are careful to grade their packs/cells and charge accordingly. I built 2 packs from 3.2v lithium iron phosphate cells for a cordless drill at work and those work well. Very fast recharge times.But even those had issues with the spring loaded battery holders softening from heat when improperly recharged. The lithium iron phosphate cells got hot enough to melt off the plastic label when overcharged. I was using the wrong charger. They also quit wor...

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    The cheap cells I bought don't do well on a weed wacker, but they aren't soldered in, so they can be swapped out for better if I wanted. I still have a couple of cheap nicad packs and between all 5 I can do what needs to be done. The cheap cells were like $1 each so I didn't expect miracles. I have bought completed packs from HobbyKing and they are careful to grade their packs/cells and charge accordingly. I built 2 packs from 3.2v lithium iron phosphate cells for a cordless drill at work and those work well. Very fast recharge times.But even those had issues with the spring loaded battery holders softening from heat when improperly recharged. The lithium iron phosphate cells got hot enough to melt off the plastic label when overcharged. I was using the wrong charger. They also quit working, but at least didn't catch fire.

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  • Lithium upgrade to 18v Black and Decker Single Source battery pack

    For high current draw you need cells rated with 25C. A weed wacker is pretty much a dead short when trimming grass. That's one of the reasons the original nicads don't last long. A cordless drill doesn't pull anywhere near the current and therefore is much gentler on the battery pack.http://www.tested.com/tech/502351-rc-battery-guide-basics-lithium-polymer-batteries/

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