Wattage of rough service incandecent bulbs ??

Started by Steve Wolf in sci.electronics.basics1 day ago 39 replies

I have build a series load test light. eg. you plug a load in and it runs in series through a lamp, in case there is a short, the lamp takes up...

I have build a series load test light. eg. you plug a load in and it runs in series through a lamp, in case there is a short, the lamp takes up the load, so as to not blow a fuse. The lamp you use should be 3 x's the load. eg 20 watt load should have a 60 watt bulb. this means that you really need a variety of lamps. Once finished I realized that getting an incandescent light bulb i


Remote repeater - bit more power to led output

Started by Bob Latham in sci.electronics.basics1 week ago 7 replies

Hi, I'd be grateful for a little advice. I use a tvLINKplus device for repeating the magic eye remote signals which are fed back through...

Hi, I'd be grateful for a little advice. I use a tvLINKplus device for repeating the magic eye remote signals which are fed back through the UHF aerial cable to my satellite box. It works OK but the output LEDs have to be fitted in exactly the right place on whatever kit you're using or it doesn't work and even then, it's not as reliable as it could be. I Would also like to drive 3 le...


OT History of Carbon

Started by default in sci.electronics.basics1 week ago

https://www.tf.uni-kiel.de/matwis/amat/iss/kap_4/advanced/t4_2_1.html#_3 or https://tinyurl.com/tubg3yk Deals with the history of carbon...

https://www.tf.uni-kiel.de/matwis/amat/iss/kap_4/advanced/t4_2_1.html#_3 or https://tinyurl.com/tubg3yk Deals with the history of carbon and it's uses, as well as refining and smelting of metals, beginning at the dawn of recorded history. An interesting read, and a post-script with links to more.


Pilot light

Started by Steve Wolf in sci.electronics.basics3 weeks ago 10 replies

I have taken some pilot lights out of a broken stove. These lamps indicated whether the element was on or the element was hot. I think they are...

I have taken some pilot lights out of a broken stove. These lamps indicated whether the element was on or the element was hot. I think they are what you call Neon lamps eg. Small glass bulb with thick Metal bars in the bulb. I want to use one of them as a pilot light for a 120vac light telling me that the switch is on . (120vac.) The light from the stove is in a nice little plastic package, ...


Cost of the Cheapest LoFi AM Transmitter ~ 20 - 30m Range

Started by Bret Cahill in sci.electronics.basics3 weeks ago 23 replies

Everything on Ebay seems to be more than $3.

Everything on Ebay seems to be more than $3.


The Triumph of Dedicated Solutions Over Double Duty; How Much Is Electronics Indirectly Influencing Mechanical Design?

Started by Bret Cahill in sci.electronics.basics4 weeks ago

There are other factors at work here. In the late 19th Century and much of= the 20th Century they didn't always have the money or tools for...

There are other factors at work here. In the late 19th Century and much of= the 20th Century they didn't always have the money or tools for more sophi= sticated designs requiring more components so mechanical design relying on = dove tails, i.e, using the rims of a bicycle wheel for the brakes instead o= f a dedicated disk rotor, seemed justified. This is in stark contrast to the way elec...


Retro Button Would Further Automation On the Boeing Max & Everything Else That Seems Sophisticated Beyond the Intelligence of Designers

Started by Bret Cahill in sci.electronics.basics1 month ago 50 replies

Put a retro or "my kingdom for a horse" switch on anything that seems unnecessarily over automated or when the additional sophistication is of a...

Put a retro or "my kingdom for a horse" switch on anything that seems unnecessarily over automated or when the additional sophistication is of a minor advantage. If anything doesn't seem perfect, tap the retro switch and you are back to flying by the seat of your pants or at least something that is less complicated / more proven technology. It may seem counter intuitive but this would actual...


Cycling Safety Transponder, 15m - 45m Range

Started by Bret Cahill in sci.electronics.basics1 month ago 14 replies

The Bike Shield app never caught on because of spotty data in scenic areas. Also some cyclists don't like posting their GPS. A transponder is...

The Bike Shield app never caught on because of spotty data in scenic areas. Also some cyclists don't like posting their GPS. A transponder is the same thing as a bike light except it's at radio frequencies, works around curves day or night, and motor vehicles tune in to the frequency posted on the "Share the Road; Get Cyclist Alerts At AM 1090" sign. It would require a dedicated


Failure mode of LEDs in overcurrent situation

Started by Andrew T. in sci.electronics.basics2 months ago 2 replies

I'm curious about what happens to an LED when it is exposed to a moderate overcurrent situation. This question came about as I was...

I'm curious about what happens to an LED when it is exposed to a moderate overcurrent situation. This question came about as I was troubleshooting some small white LED lights I built using 3 5mm LEDs and a current limiting resistor to run on 12Vdc (supplied by a lead-acid battery charged by solar). After some time, many of these strings would start to flicker or blink. I was about to po...


Crimping technique?

Started by Terry Pinnell in sci.electronics.basics2 months ago 3 replies

Is a crimping tool supposed to work on these things? https://www.dropbox.com/s/hnflor5ratjg06s/CrimpingMaleHeader.jpg?raw=1 All of my...

Is a crimping tool supposed to work on these things? https://www.dropbox.com/s/hnflor5ratjg06s/CrimpingMaleHeader.jpg?raw=1 All of my attempts so far have splayed three of the four squashable sections outwards instead of squeezing them inwards. (The exception is the bit that?s already folded.) Using thin nosed pliers I can make a reasonable connection. Although even with that method it...


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