Zener kinda turns on

on this one :-)

Actually several of them may or may not work depending on all the unstated part values. Oh, now i remember you post topologies that might work if proper parts values were used, but you never calculate anything through around here.

Pretender.

?-)

one :-)

I've figured a simple solution to this controversy...

I'll simply post a .ASC file for every Larkin fraudulent post >:-}

Then everyone can test it for themselves.

White trash always get caught in the END... literally >:-} ...Jim Thompson

one :-)

They will all work. I don't know if you can figure out how to make them work. If you have to ask, I assume you can't.

Oh, now i remember you post topologies that might work if

Sometimes I post schematics with values, sometimes Spice sims, sometimes sheets from actual products.

On Wed, 17 Apr 2013 08:42:50 -0700 (PDT), panfilero wrote:

turns on and if you power it up with 12V the 5V LED goes off and the 12V indicator goes on.

until I provide it a voltage drop of 5.6V, and since it's in series with some other stuff (resistors and an LED) I thought it would definitely be off at 5V, but it's on just enough to turn on my FET M1 and not let my D4 LED light up... I'm basically measuring a little over 1V at the gate.

maybe, but why is D1 turning on at all? Is it leakage current that's causing this circuit not to work at 5V? D3 the 12V LED is definitely off at a 5V supply (as it should be) and the circuit works at 12V... but not at 5V...

--- Try this:

Version 4 SHEET 1 880 904 WIRE 400 0 400 -16 WIRE -256 32 -432 32 WIRE -32 32 -256 32 WIRE 112 32 -32 32 WIRE 160 32 112 32 WIRE -256 64 -256 32 WIRE -32 112 -32 32 WIRE 400 112 400 80 WIRE 256 208 256 192 WIRE -256 224 -256 144 WIRE -144 224 -256 224 WIRE 224 224 -144 224 WIRE 400 240 400 176 WIRE 400 240 288 240 WIRE -256 256 -256 224 WIRE -256 256 -288 256 WIRE -32 256 -32 192 WIRE 224 256 -32 256 WIRE -432 288 -432 32 WIRE -256 288 -256 256 WIRE 256 288 256 272 WIRE -32 320 -32 256 WIRE 400 368 400 352 WIRE 112 432 112 32 WIRE 400 480 400 448 WIRE 256 576 256 560 WIRE 112 592 112 512 WIRE 224 592 112 592 WIRE 400 608 400 544 WIRE 400 608 288 608 WIRE -144 624 -144 224 WIRE 224 624 -144 624 WIRE 112 656 112 592 WIRE 256 656 256 640 WIRE -144 672 -144 624 WIRE -432 768 -432 368 WIRE -256 768 -256 352 WIRE -256 768 -432 768 WIRE -144 768 -144 736 WIRE -144 768 -256 768 WIRE -32 768 -32 400 WIRE -32 768 -144 768 WIRE 112 768 112 736 WIRE 112 768 -32 768 WIRE -432 848 -432 768 FLAG -432 848 0 FLAG 256 288 0 FLAG 256 656 0 FLAG 400 -16 Vcc FLAG 400 352 Vcc FLAG -288 256 +2.5 FLAG 160 32 Vcc FLAG 256 192 Vcc FLAG 256 560 Vcc SYMBOL voltage -432 272 R0 WINDOW 3 24 104 Invisible 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR Value PULSE(5 12 0 1ms 1ms 1 2) SYMATTR InstName V1 SYMBOL Comparators\\LT1017 256 240 R0 SYMATTR InstName U1A SYMBOL Comparators\\LT1017 256 608 R0 SYMATTR InstName U1B SYMBOL References\\LT1634-2.5 -256 320 R0 WINDOW 3 -128 46 Left 2 WINDOW 0 -88 3 Left 2 SYMATTR InstName U3 SYMBOL res -272 48 R0 SYMATTR InstName R1 SYMATTR Value 10k SYMBOL res 384 352 R0 SYMATTR InstName R2 SYMATTR Value 430 SYMBOL LED 384 112 R0 WINDOW 0 -40 28 Left 2 WINDOW 3 -100 -8 Left 2 SYMATTR InstName D1 SYMATTR Value NSCW100 SYMATTR Description Diode SYMATTR Type diode SYMBOL res 384 -16 R0 SYMATTR InstName R3 SYMATTR Value 62 SYMBOL LED 384 480 R0 WINDOW 0 -43 31 Left 2 WINDOW 3 -100 -7 Left 2 SYMATTR InstName D2 SYMATTR Value NSCW100 SYMATTR Description Diode SYMATTR Type diode SYMBOL res -48 96 R0 SYMATTR InstName R4 SYMATTR Value 10k SYMBOL res -48 304 R0 SYMATTR InstName R5 SYMATTR Value 6800 SYMBOL res 96 416 R0 SYMATTR InstName R6 SYMATTR Value 10k SYMBOL res 96 640 R0 SYMATTR InstName R7 SYMATTR Value 3300 SYMBOL cap -160 672 R0 SYMATTR InstName C1 SYMATTR Value 10n TEXT -408 824 Left 2 !.tran 0 5 0 TEXT 472 528 Left 3 ;12V TEXT 472 160 Left 3 ;5V TEXT 312 720 Left 2 ;J Fields TEXT 312 752 Left 2 ;23 APR 2013

-- JF

sheets

I mostly post circuits. If you perceive my circuits as "braggadocio" you must think that they are pretty good. Thanks for the compliment.

Your LED thing is OK, but it does have a dead zone. You could eliminate that and reduce the parts count by taking the output of one comparator, inverting it, and driving the second LED.

sheets

"Sometimes I post schematics with values, sometimes Spice sims"... WHEN?

Lots of purty pictures. NO demonstration of DESIGN capability.

But lots of demonstration of hilarity, as in...

"Hey, I just invented the LED differential pair!"

SIM it in LTspice if you can't see the problem "by observation" >:-}

If the object is only to denote which supply is being used, my 556 version reduces to...

sheets

sheets

He's killfiled me, the moron. And then he whines about what I don't post. Did I mention that he's a moron?

What's the problem, moron?

this one :-)

I'm being killfiled and stalked at the same time. JT is unclear on some concepts here. [1]

Pick one of my 5/12 volt LED circuits, one you think can't work, and do just that. Demonstrate that it can't work.

sheets

and

sheets

and

Full .ASC file at... Message-ID:

Looks like the LTspice LED model is for a white LED. That's why I just reworked my PSpice libraries so that "RED" definitely calls up a RED model. ...Jim Thompson

sheets

sheets

must

and

sheets

You can't tell that for sure (*).. after all, it's a Larkin "design", thus no component values >:-} I'd guess that NOLA white trash can't do even simple-minded math.

(*) Burn enough current and you can swamp out beta effects.

Like I said, those that are so slow-witted that they can't see the obvious problem with Larkin's "design", simply run it in LTspice.

Unfortunately most of Larkin's butt-buddies aren't even capable of doing that. ...Jim Thompson

sheets

must

it, and

Just advisory. I wasn't criticizing. The libraries in LTspice can mislead. ...Jim Thompson

sheets

He only does it erratically, when he forgets to pretend that he's killfiled me.

When I pointed out that he got the 5v/12v LED thing functionally wrong, he remembered that he killfiled me!

I think he has officially killfiled/unkillfiled me about 10 times by now. He's confused and conflicted. And did I mention that he's a moron?

Hey, that's a great concept you have there, namely that circuit topologies are of interest independent of component values.

Of course, some people are adamently against that idea. Like you.

--

John Larkin Highland Technology Inc

Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators

sheets

and

Agreed. It's an improvement on your circuit, which was klunkier.