Nothing new. They said the same thing about the candle makers.Must be bad times for manufacturers of small E10 Incandescent lamps?
Nothing new. They said the same thing about the candle makers.Must be bad times for manufacturers of small E10 Incandescent lamps?
I actually had a model 200 oscillator at one time.I had to look that up to see what it is, and discovered some of it's history:
https://en.wikipedia.org/wiki/Wien_bridge_oscillator
"Hewlett-Packard's first product was the HP200A, a precision Wien bridge oscillator."
"The HP200A was the first product made by Hewlett-Packard and was manufactured in David Packard's garage in Palo Alto, California."
Some of them do another neat trick - an early HP oscillator was reported to have turned up on an auction site with an impressive number of noughts on the price tag.Lovely oscillators, but they only do one trick, sine waves.
A 1970 design gives me squares and triangles with swept frequency outputs.
Some have frequency markers, burst settings, and all manner of cool things.
A professor in grad school had one as a paperweight on his desk for years. I better check in to see if he still has it.Some of them do another neat trick - an early HP oscillator was reported to have turned up on an auction site with an impressive number of noughts on the price tag.
You can actually cheat - there is one manufacturer that makes high voltage depletion mode MOSFETs, as long as grids are just control, screen and suppressor, you can ignore the screen and suppressor and just feed the control grid signal to the gate.I still have my 200 CD, just hope that the tubes hold out a little longer.
Last phone I took to bits had a 200V bidirectional breakdown diode protecting the line terminals.Here the green neon lamp. Powering using an old telephone cable. Its not rated for 230 volts, guess.
View attachment 73880
Hi,
I had to think about this for a minute. I dont use any incandescent bulbs anymore except in the car and at Christmas time.
I've always deeply hated the color of regular incandescent bulbs, especially in flashlights. Not only that, the flashlight bulbs always had a really really nasty light pattern with all kinds of junk in the pattern. It was better than a flame torch, that's the only reason i used one at all.
Then came the white LED. That changed everything. My first LED flashlight was a single Nichia 5mm that needed a lens on the front just to get a usable amount of brightness in one little spot out in front. I still liked it better than any flashlight i ever had.
Now we have Cree, and with that the world looks more lit up than ever before, and there's no strange artifacts in the pattern or anything like that.
And there's nothing else that can touch the brightness per package size. The LED light i have now lights up the whole back yard and still fits in the back pocket.
Oven lights and refrigerator lights...
They dont really need to be internal either if you dont mind opening the door first. The light can be mounted externally out in front a little so when the door is open the light shines in from the front. I did my refridge light like that as that has to be opened to see inside anyway.
For ovens there can probably be a little glass chamber with the LED inside, with a small fan to keep air circulating from outside the oven through the small chamber to keep the LED cool. Downside is it would have to run any time the oven is on, not just when the LED is on.
Hi,"Then came the white LED. That changed everything."
I hear that.
Now I have a few 100, and 50 watts work lights, in smaller spaces.
So much brighter, and longer lasting than incandescent.
After the early blue-tinged LEDs, even halogen look a bit yellow.For stage and theatre work, it is still the incandescent lamp that wins every time. I still use them from 6 volt LES to 240 volt @ 2Kw G38 TH lamps.
Daniel.