1. Home
  2. Electronics Design
  3. Zener kinda turns on
  4. Page 5

Zener kinda turns on

pen,

The challenge is to *design* something that works, not to Spice it and fiddle until it seems to work.

--

John Larkin                  Highland Technology Inc 
www.highlandtechnology.com   jlarkin at highlandtechnology dot com    

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
Reply to
John Larkin
Loading thread data ...

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.

?-)

Reply to
josephkk

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

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| Phoenix, Arizona  85048    Skype: Contacts Only  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
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.

--

John Larkin                  Highland Technology Inc 
www.highlandtechnology.com   jlarkin at highlandtechnology dot com    

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
Reply to
John Larkin

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

Reply to
John Fields 

--
But mostly you post braggadocio.
Reply to
John Fields

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.

--

John Larkin                  Highland Technology Inc 
www.highlandtechnology.com   jlarkin at highlandtechnology dot com    

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
Reply to
John Larkin

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!"

formatting link

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...

formatting link
...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| Phoenix, Arizona  85048    Skype: Contacts Only  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson

sheets

--
No compliment intended, and you don't mostly post circuits, you mostly 
post self-aggrandizing rhetoric exalting yourself at the expense of 
others.
Reply to
John Fields

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?

--

John Larkin         Highland Technology, Inc 

jlarkin at highlandtechnology dot com 
http://www.highlandtechnology.com 

Precision electronic instrumentation 
Picosecond-resolution Digital Delay and Pulse generators 
Custom laser drivers and controllers 
Photonics and fiberoptic TTL data links 
VME thermocouple, LVDT, synchro   acquisition and simulation
Reply to
John Larkin

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.

[1] the pretend killfile nonsense lets him evade criticism. He's clearly a coward. 
--

John Larkin         Highland Technology, Inc 

jlarkin at highlandtechnology dot com 
http://www.highlandtechnology.com 

Precision electronic instrumentation 
Picosecond-resolution Digital Delay and Pulse generators 
Custom laser drivers and controllers 
Photonics and fiberoptic TTL data links 
VME thermocouple, LVDT, synchro   acquisition and simulation
Reply to
John Larkin

sheets

and

--
Just for grins, using LTC library parts: 

Version 4 
SHEET 1 880 680 
WIRE 128 -16 -192 -16 
WIRE 240 -16 128 -16 
WIRE 272 -16 240 -16 
WIRE 400 -16 352 -16 
WIRE 128 32 128 -16 
WIRE 400 48 400 -16 
WIRE 240 112 240 -16 
WIRE -192 144 -192 -16 
WIRE 128 144 128 112 
WIRE 208 144 128 144 
WIRE 400 144 400 112 
WIRE 400 144 288 144 
WIRE 208 176 -32 176 
WIRE 128 208 128 144 
WIRE -32 224 -32 176 
WIRE 224 224 224 208 
WIRE 240 224 240 208 
WIRE 240 224 224 224 
WIRE 400 224 400 144 
WIRE -192 352 -192 224 
WIRE -32 352 -32 304 
WIRE -32 352 -192 352 
WIRE 128 352 128 288 
WIRE 128 352 -32 352 
WIRE 224 352 224 224 
WIRE 224 352 128 352 
WIRE 256 352 256 208 
WIRE 256 352 224 352 
WIRE 272 352 256 352 
WIRE 400 352 400 288 
WIRE 400 352 352 352 
WIRE -192 416 -192 352 
FLAG -192 416 0 
SYMBOL voltage -192 128 R0 
WINDOW 3 24 96 Invisible 2 
WINDOW 123 0 0 Left 2 
WINDOW 39 0 0 Left 2 
SYMATTR Value PULSE(5 12 1 1ms 1ms 1 2) 
SYMATTR InstName V1 
SYMBOL res 112 16 R0 
SYMATTR InstName R1 
SYMATTR Value 10k 
SYMBOL res 112 192 R0 
SYMATTR InstName R2 
SYMATTR Value 5.1k 
SYMBOL res 368 -32 R90 
WINDOW 0 0 56 VBottom 2 
WINDOW 3 32 56 VTop 2 
SYMATTR InstName R4 
SYMATTR Value 420 
SYMBOL res 368 336 R90 
WINDOW 0 0 56 VBottom 2 
WINDOW 3 32 56 VTop 2 
SYMATTR InstName R5 
SYMATTR Value 51 
SYMBOL LED 384 48 R0 
SYMATTR InstName D2 
SYMATTR Value NSCW100 
SYMBOL LED 384 224 R0 
SYMATTR InstName D3 
SYMATTR Value NSCW100 
SYMBOL voltage -32 208 R0 
WINDOW 3 24 96 Invisible 2 
WINDOW 123 0 0 Left 2 
WINDOW 39 0 0 Left 2 
SYMATTR Value 3.3 
SYMATTR InstName V2 
SYMBOL Comparators\\LT1711 240 160 R0 
SYMATTR InstName U1 
TEXT -160 384 Left 2 !.tran 5 uic
Reply to
John Fields

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

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| Phoenix, Arizona  85048    Skype: Contacts Only  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson

sheets

--
We're not all troglodytes, so most of us are aware that, since Jim has 
been responding to your posts without the use of proxies for quite 
some time now, that you're no longer killfiled. 

YMMV.
Reply to
John Fields

sheets

must

and

--

So what? 

The topology remains the same and all that changes is the values of 
the resistors.
Reply to
John Fields

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

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| Phoenix, Arizona  85048    Skype: Contacts Only  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
Jim Thompson

sheets

must

it, and

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

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| Phoenix, Arizona  85048    Skype: Contacts Only  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.
Reply to
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?

--

John Larkin         Highland Technology, Inc 

jlarkin at highlandtechnology dot com 
http://www.highlandtechnology.com 

Precision electronic instrumentation 
Picosecond-resolution Digital Delay and Pulse generators 
Custom laser drivers and controllers 
Photonics and fiberoptic TTL data links 
VME thermocouple, LVDT, synchro   acquisition and simulation
Reply to
John Larkin

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

formatting link
jlarkin at highlandtechnology dot com

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

Reply to
John Larkin

sheets

and

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

--

John Larkin                  Highland Technology Inc 
www.highlandtechnology.com   jlarkin at highlandtechnology dot com    

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
Reply to
John Larkin

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.