sheets
Beta biasing? Where?
He asked for one LED to be on with a 5-volt supply and the other to be on with a
12-volt supply. The circuit needs to work for a reasonable tolerence on both supplies. Both on in some small presumably-never-happens transition region is as good a scheme as any.What Jim did with his second circuit *was* wrong. His "5V" LED was still on at
11.9 volts, and both were off at 4.9.-- 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
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...
One final pass...
then back to real work >:-} ...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.
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...
I'd never design anything that clumsy. And you obviously Spice-fiddled it until you got it to work. At least you got the transition voltage
*between* 5 and 12 this time.-- 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
I can play PSpice in LTspice, but never showed how before...
Copy the following to a file named "Panfilero_LED_4_LTC.cir"
Then OPEN and RUN with LTspice.
Watch for any wrap issues.
** C:\Projects\Expments\SED\Panfilero_LED_4_LTC.cir ** Concatenated from PSpice .CIR + .NET ** Analysis setup ** .tran 15m 15m 0 1u .OPTIONS ITL1=1500 .OPTIONS ITL2=2000 .OPTIONS ITL4=1000 .OP Q_Q1 N_2 N_1 0 Q2N3904 R_R2 N_3 N_4 1.5K R_R3 N_5 N_1 4.3K Q_Q2 N_5 N_6 0 Q2N3904 R_R6 N_7 N_6 4.7K R_R5 N_6 0 2.7K R_R1 VCC N_3 560 R_R4 VCC N_5 10K X_DZ1 N_7 VCC MyZENER PARAMS: BV=7.5V IBV=250uA RS=200
--
| 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.
sheets
must
and
-- I already posted the full .asc file here, so why are you redirecting its origin?
sheets
must
it, and
Too much wine already, John? I snipped the bulk of your .ASC listing to keep the posting short, but marked it for anyone entering the discussion late to the game.
Damn! Maybe _you_ are go "Just advisory. I wasn't criticizing. The libraries in LTspice can mislead."
Cranky old fart >:-} ...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.
sheets
must
it, and
-- Nope, there's never too much wine. ---- >I snipped the bulk of your .ASC listing to keep the posting short, but marked it for anyone entering the discussion late to the game.
it for anyone entering the discussion late to the game.
I was replying to your post that included the full .ASC listing, which made the post rather long.
So I trimmed the .ASC listing to shorten the overall message but added a link to the full message if anyone missed it.
Capish ?:-)
Next time I'll leave an explanatory note for any of you who are mentally slowing down >:-}
Note to Larkin and his butt buddies:
See!! Fields and I will cut each other's throat, if necessary to make a point ;-) ...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.
The point being that you are both crabby old hens.
Hey, we all knew that already.
--
John Larkin Highland Technology, Inc
jlarkin at highlandtechnology dot 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
before JF
get
yet a pen,
is
you
file
fiddle
You clearly DID NOT READ what i posted. Lame flame.
?-)
JF
pen,
Yup. A lame flame from a lame brain >:-} ...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.
sometimes sheets
must
Poor self deluded Larkin, doesn't understand braggadocio is an insult, similar to "talking trash" or lying.
that and
it, and
sometimes sheets
"braggadocio" you must
mostly
inverting it, and
That is true, every spice can. I wish LTspice had a complete set of LT parts as well, but it doesn't.
?-)
sometimes sheets
must
it, and
I'm working my way thru "talking" to LTspice from other simulators. Some peculiarities... LTspice doesn't treat ".LIB" like other simulators, more like it behaves as ".INC", which barfs on components you haven't even called out to use in your schematic :-( ...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.
sheets
and
and
Clueless white trash is the BEST descriptor I can find for Larkin. ...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.
sheets
Post a circuit yourself. Whine or design.
-- 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
sometimes sheets
must
it, and
And I've just figured out why. PSpice "indexes" a library, so there's both a .LIB file and a matching .IND file. PSpice uses the .IND file to quickly grab, and put into memory, only those parts in the schematic. LTspice loads the whole library and checks it for LTspice compatibility :-( ...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.
Just so long as you don't adopt his "signature" catchprase.
--
"For a successful technology, reality must take precedence
over public relations, for nature cannot be fooled."
(Richard Feynman)
Not much use as a design, then...
--
"For a successful technology, reality must take precedence
over public relations, for nature cannot be fooled."
(Richard Feynman)
Don't you mean "prescribed"?
"Proscribed" means "forbidden".
-- "For a successful technology, reality must take precedence over public relations, for nature cannot be fooled." (Richard Feynman)
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