They are. Several of us have measured them, and in the His Master's Noise preamp, a forward biased LED is effectively in series with the input signal. And it manages to be the quietest tube phono stage I'm aware of.
Taking engineering guidance from a loon is not my idea of competent design, but to be fair, I don't make my money from fashion and superstition.
When in Iceland don't miss the kæstur hákarl , it made Gordon Ramsay spontaneously boot on camera.
SMD ones are better, you can get the heat away from the die, just done a truck light set using SMD ones and did some traffic lights last year.
They excite the rods as well as the cones....
You'll notice in nature not many things are blue... (sky excluded)
The pulse oximeters build the one-time-use things for three bucks and sell them for eighty. Another example of the screwed up med markets.
You could have avoided making a tube amp and saved time and money as well, SY. Talk about fashion! '-)
I was surprised how much is throw away these days in hospitals in the UK, so scared of infection....
That's cool. So there is a correlation of optical and electrical noise. Now if the optical aging degradation associates with increased optical noise we could be on to something pertaining to bias voltage applications.
I reminds of having attempted to cross the" Porte d' Italie" (In Paris) by bike. The most terrifying experience of my life.
Yes, but less fun and educational to design and build, which was the point of the exercise. Unlike the hucksters, I don't sell this stuff nor make unsubstantiated claims about it.
The thing that amazes me about leds is the stability of the forward
voltage with differing currents. I use them to bias AB amps and can
use between 1k and 100k from a given voltage with usable (non)variation .......
voltage with differing currents. I use them to bias AB amps and can
use between 1k and 100k from a given voltage with usable (non)variation .......
Aargh, why haven't I seen that video ages ago ?
I should have known there are Four Knobqueteers, not 3 !
Abfab, downloaded it for therapeutic purposes (only).
Hick question, but is accelerated aging not applicable to/for LED's ?
(had to look up the pronunciation of Icelandic sheep head : svith)
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I gave up on 'fun' after I built my first Heathkits in the early 60's. IF you want to live, one has to do something to pay the rent. The CTC Blowtorch was our best effort in a compromising audio environment. We wanted to see what we could do BEST within using fets, rather than tubes. We made them for ourselves, primarily, but paid for our units by building building more for other people. I could never have been able to afford a CTC Blowtorch, if I did not do it this way. However, we put the same care and effort into other people's units as our own. In the end, we wound up not making enough on each unit to even make it worthwhile to make them anymore to compensate for the time and COST it took to build them. When our bare boards essentially ran out (100 for about $5000) we decided not to make another batch, and Bob wanted to give away the schematic and BOM to everyone, so they could build one, if they wanted. Unfortunately, Bob Crump, the primary BUILDER of the Blowtorch passed away suddenly, leaving me with about 8 units to finish, because they were prepaid. I was stuck finishing them (#40 is one of these I believe) the best that I could, but I had to compromise on the internal wiring (copper instead of silver) and there was a small, but noticeable difference, but I had to do that or else pay back the $50,000 dollars that Bob had received earlier for 5 units destined for Japan. I don't think my finished units quite matched what Bob had done for himself, me, and about 39 other customers, but it took me many months to finish them. While doing this, I decided to hold back the schematics, rather than give them away, and that is what started this thread.
Isn't adding an LED series resistor about the easiest diy mod there is?
Since the Texas state flower is the bluebonnet, "not many" was indeed hard to notice.
Since the Texas state flower is the bluebonnet, "not many" was indeed hard to notice.
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