There are more ways to make a circuit not work, than to make it work.
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation
That's usually JF's MO.
Jamie
On a sunny day (Tue, 29 Apr 2014 18:23:04 -0700) it happened John Larkin wrote in :
I have some 5V DC adaptors from ebay, with blue LEDs. Those are very bright. I also have some black write protection labels for 5 1/4 inch floppies. Put the labels over the LEDs, you can still see the LEDs through it, but no longer blinding.
One day I am sure those labels will be harder to find. The labels are on my audio amp and my monitor too.
-- No. It can pump current into the forward and reverse capacitances of both diodes and out of the diode with the grounded anode, but not into the bulk resistance of the LED.
-- And that's a bad thing, why?
-- Here's his circuit; where does the boost come from? Version 4 SHEET 1 880 680 WIRE 160 96 112 96 WIRE 272 96 224 96 WIRE 384 96 272 96 WIRE 112 144 112 96 WIRE 272 144 272 96 WIRE 384 144 384 96 WIRE 112 288 112 224 WIRE 272 288 272 208 WIRE 272 288 112 288 WIRE 384 288 384 208 WIRE 384 288 272 288 WIRE 112 368 112 288 FLAG 112 368 0 SYMBOL voltage 112 128 R0 WINDOW 3 24 96 Invisible 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value PULSE(0 3 0 10n 10n 500n 1u) SYMBOL cap 224 80 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C1 SYMATTR Value 100n SYMBOL diode 288 208 R180 WINDOW 0 24 64 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D1 SYMATTR Value 1N4148 SYMBOL LED 368 144 R0 SYMATTR InstName D2 SYMATTR Value NSCW100 SYMATTR Description Diode SYMATTR Type diode TEXT 120 336 Left 2 !.tran 100u
You drew it wrong. Look again. It's a *booster*.
Your point about variable frequency -> variable current is worth looking into, but you do not understand the actual circuit at all.
You drew it wrong. Look again.
[...]-- John Devereux
-- Aarghhh!!! You're right, thanks for the reality check. John Fields
That is not my circuit.
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation
Bright blue LEDs are annoying.
-- John Larkin Highland Technology, Inc jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
-- Right. Mea culpa. John Fields
You are always too eager to prove me wrong.
-- John Larkin Highland Technology, Inc jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
-- The more quickly dealt with, the better. John Fields
But it's you who are usually wrong. Like this time. And many others.
Good engineers don't let emotion blind their rational perceptions. And they check their work before they publish (or build) it.
If you enjoy being wrong in public, posting mea culpas in quantity, don't change a thing.
-- John Larkin Highland Technology, Inc jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Hey, I thought it was my job to screw up and say silly things on SED. Kind of like a court jester.
George H.
-- Sounds like Larkin's giving you a run for the money... John Fields
--- Of course I don't enjoy being wrong in public, but when I am I acknowledge my error, learn from it, and get on with my life.
On the other hand, when you make an error - even a bald-faced one and are called to task for it - you immediately take the position that you're infallible and then vigorously stir the pot with the intent of finding the tiniest straw you can latch on to in order to steer the "discussion" in a direction - any direction - away from the focus on your error.
The purpose of all your machinations, of course, is to derail the discussion by changing the subject, thereby negating your need to account for your error and allowing you to continue with your charade.
John Fields
Buy you are nice and funny and interested in things, and do interesting physics stuff. JF isn't interested in electronics or physics or economics or anything; he just wants to argue and whine. Which is why he jumps to dispute things, posting absurd LT Spice sims, before he thinks.
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation
If you don't enjoy it, think a little before you post.
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.