What is a "wet contactor"

Started by Bob Engelhardt in sci.electronics.basics6 months ago 17 replies

An eBay listing for a electronic tachometer specifies that it's input can be a "wet contactor". Is there a standard meaning for "wet...

An eBay listing for a electronic tachometer specifies that it's input can be a "wet contactor". Is there a standard meaning for "wet contactor"? Thanks, Bob


Anti Spark Ignition of _All_ Fuels, Not Just Trees & Brush

Started by Bret Cahill in sci.electronics.basics6 months ago 5 replies

It's hard to imagine any technology relying on poppet valves, cranks, dynamic seals and other nonsense lasting more than 160...

It's hard to imagine any technology relying on poppet valves, cranks, dynamic seals and other nonsense lasting more than 160 years. https://www.bloomberg.com/news/articles/2017-12-05/california-bill-to-banish-gasoline-cars-by-20 40-is-in-the-works A progressive carbon fuel tax would be preferable according to Milton Friedman but if a complete ban is more politically correct, then that'll be w


keeping tools/devices dry (rice)

Started by Anonymous in sci.electronics.basics6 months ago 24 replies

Will putting a pouch of rice in a toolbox with devices stop rust? (I remember this was recommended, but I don't remember where)

Will putting a pouch of rice in a toolbox with devices stop rust? (I remember this was recommended, but I don't remember where)


Triac efficiency

Started by Anonymous in sci.electronics.basics6 months ago 10 replies

Hi everyone, When regulating the power to a motor or light, does the triac do so efficiently or does it dump the unwanted power as heat, as a...

Hi everyone, When regulating the power to a motor or light, does the triac do so efficiently or does it dump the unwanted power as heat, as a linear voltage regulator does? Thanks, Michael


One Thing I Never Understood - Tunnel Diodes

Started by Anonymous in sci.electronics.basics6 months ago 9 replies

Its theory of operation escapes me. I know there is a negative resistance part of its IE curve, but doesn't that just make it into a current...

Its theory of operation escapes me. I know there is a negative resistance part of its IE curve, but doesn't that just make it into a current source through that range ? I read they can make an oscillator out of it or a UHF amp, and Tektronix used them in their trigger circuit in scopes. (those did seem to be really good triggering circuits, would lock onto anything) Is there a place with som...


Zoho Setup | GST filing | Accounting services Hyderabad

Started by Anonymous in sci.electronics.basics6 months ago

Free Zoho Setup | Zoho Activation | Alchemistconsultants. The Goods and Services Tax has changed the Indian tax collection...

Free Zoho Setup | Zoho Activation | Alchemistconsultants. The Goods and Services Tax has changed the Indian tax collection framework. The GST Act was passed in the Lok Sabha on 29th March 2017 and came into effect from first July 2017. GST filing is a solitary assessment of the supply of goods and services, right from the producer to the Zoho setup consumer. Credits of


Custom Fingerboards

Started by Searcher7 in sci.electronics.basics6 months ago 7 replies

I wanted to ask if it were possible to create printed circuit fingerboards with trace thicknesses that are thicker on one end than the other?...

I wanted to ask if it were possible to create printed circuit fingerboards with trace thicknesses that are thicker on one end than the other? http://i290.photobucket.com/albums/ll257/Statenislander/Finger%20Board_zpsvqljyqll.jpg I ask because I am working on a custom project that will require connectors to plug onto a fingerboard from both edges. One edge will entail a semi pe


Refrigeration To Reduce Battery Size / Overall Energy Storage Costs

Started by Bret Cahill in sci.electronics.basics6 months ago 29 replies

90% of the electric bill in the desert at this time of the year is HVAC. The rest of the house doesn't need so much power and only requires a...

90% of the electric bill in the desert at this time of the year is HVAC. The rest of the house doesn't need so much power and only requires a small low cost battery for night time. Freeze about 2 tons of water during the day and then sink heat into the ice at night. Maybe 2/3rds of the solar power goes to running the conventional AC or heat pump during the day and 1/4 goes to freezing water...


Plating Tiny Contacts

Started by Searcher7 in sci.electronics.basics6 months ago 9 replies

Can someone advise me on whether it is possible to (Nickel or Gold) plate a small item like an electrical contact while it is still attached to...

Can someone advise me on whether it is possible to (Nickel or Gold) plate a small item like an electrical contact while it is still attached to the leaf, or does it have to be removed? http://i290.photobucket.com/albums/ll257/Statenislander/LeafSW1_zpsimx5esvz.jpg Thanks. Darren Harris Staten Island, New York.


Banana plugs and jacks

Started by George Herold in sci.electronics.basics7 months ago 27 replies

OK this is a silly question. You've got banana plugs and jacks... which is the female and which male. (I can find it both ways online.) ...

OK this is a silly question. You've got banana plugs and jacks... which is the female and which male. (I can find it both ways online.) George H.


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