On Fri, 15 Feb 2013 21:01:57 -0800, Bill Bowden wrote:
> But the display doesn't indicate
> what voltage occurs at what temperature. How to fix that?
Right click on the plot screen. Click on "Select Steps"
--
"For a successful technology, reality must take precedence
over public relations, for nature cannot be fooled."
(Richard Feynman)
Reply by Bill Bowden●February 16, 20132013-02-16
On Feb 14, 8:11=A0pm, John Larkin
<jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
> On Thu, 14 Feb 2013 18:45:56 -0800 (PST), Bill Bowden
>
> <bper...@bowdenshobbycircuits.info> wrote:
> >Is it possible to simulate circuit performance using LTSpice under
> >different temperature conditions? Say you have a single NPN transistor
> >with grounded emitter and a collector load and a resistor from base to
> >collector so the collector voltage is about half the supply voltage. I
> >understand the result would depend on the HFE of the transistor,
> >temperature, and maybe not very stable. Just wondering if LTSpice can
> >provide any interesting information for some particular transistor. DC
> >voltage change verses temperature.
>
> >-Bill
>
Yes, that works fine to plot the e/b and b/c voltage temp conditions.
I tried adding a spice directive of (.step temp 0 50 5) to my
transistor stage and I get 10 lines displayed (5 to 6 volts) which I
presume correspond to the 10 temperature steps. But the display
doesn't indicate what voltage occurs at what temperature. How to fix
that?
-Bill
Version 4
SHEET 1 880 680
WIRE 144 16 16 16
WIRE -128 144 -192 144
WIRE 16 144 16 96
WIRE 16 144 -64 144
WIRE 16 208 16 144
WIRE -192 256 -192 144
WIRE -160 256 -192 256
WIRE -48 256 -80 256
WIRE 16 320 16 304
FLAG 144 96 0
FLAG 16 320 0
SYMBOL voltage 144 0 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL npn -48 208 R0
SYMATTR InstName Q2
SYMATTR Value 2N3904
SYMBOL res 0 0 R0
SYMATTR InstName R3
SYMATTR Value 22k
SYMBOL res -64 240 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R4
SYMATTR Value 5000k
SYMBOL diode -64 128 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 36 -4 VTop 0
SYMATTR InstName D2
SYMATTR Value 1N4148
TEXT -40 392 Left 0 !.step temp 0 50 5
TEXT -200 392 Left 0 !.tran .1s
Reply by John Larkin●February 15, 20132013-02-15
On Fri, 15 Feb 2013 05:53:43 -0800 (PST), George Herold <gherold@teachspin.com>
wrote:
>On Feb 14, 11:11�pm, John Larkin
><jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
>> On Thu, 14 Feb 2013 18:45:56 -0800 (PST), Bill Bowden
>>
>> <bper...@bowdenshobbycircuits.info> wrote:
>> >Is it possible to simulate circuit performance using LTSpice under
>> >different temperature conditions? Say you have a single NPN transistor
>> >with grounded emitter and a collector load and a resistor from base to
>> >collector so the collector voltage is about half the supply voltage. I
>> >understand the result would depend on the HFE of the transistor,
>> >temperature, and maybe not very stable. Just wondering if LTSpice can
>> >provide any interesting information for some particular transistor. DC
>> >voltage change verses temperature.
>>
>> >-Bill
>>
>> Here's a simple temperature sweep example:
>>
>> https://dl.dropbox.com/u/53724080/Circuits/TC_diode_sweep.asc
>
>Hey dropbox is pretty cool! (I need to investigate)
Dropbox is fabulous. The same files appear on all your PCs, anywhere. I use it
for my mountain cabin automation system, as a painless and reliable way to share
files in real time. And for work+home projects: no more flash sticks!
I use it for sharing big files with my clients, too.
--
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 by George Herold●February 15, 20132013-02-15
On Feb 14, 11:11=A0pm, John Larkin
<jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
> On Thu, 14 Feb 2013 18:45:56 -0800 (PST), Bill Bowden
>
> <bper...@bowdenshobbycircuits.info> wrote:
> >Is it possible to simulate circuit performance using LTSpice under
> >different temperature conditions? Say you have a single NPN transistor
> >with grounded emitter and a collector load and a resistor from base to
> >collector so the collector voltage is about half the supply voltage. I
> >understand the result would depend on the HFE of the transistor,
> >temperature, and maybe not very stable. Just wondering if LTSpice can
> >provide any interesting information for some particular transistor. DC
> >voltage change verses temperature.
>
> >-Bill
>
> Here's a simple temperature sweep example:
>
> https://dl.dropbox.com/u/53724080/Circuits/TC_diode_sweep.asc
Hey dropbox is pretty cool! (I need to investigate)
George H.
.highlandtechnology.com=A0 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 =A0analog, thermocouple, LVDT, synchro, tachometer
> Multichannel arbitrary waveform generators
Reply by John Larkin●February 15, 20132013-02-15
On Thu, 14 Feb 2013 18:45:56 -0800 (PST), Bill Bowden
<bperryb@bowdenshobbycircuits.info> wrote:
>Is it possible to simulate circuit performance using LTSpice under
>different temperature conditions? Say you have a single NPN transistor
>with grounded emitter and a collector load and a resistor from base to
>collector so the collector voltage is about half the supply voltage. I
>understand the result would depend on the HFE of the transistor,
>temperature, and maybe not very stable. Just wondering if LTSpice can
>provide any interesting information for some particular transistor. DC
>voltage change verses temperature.
>
>-Bill
Here's a simple temperature sweep example:
https://dl.dropbox.com/u/53724080/Circuits/TC_diode_sweep.asc
--
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 by Bill Bowden●February 14, 20132013-02-14
Is it possible to simulate circuit performance using LTSpice under
different temperature conditions? Say you have a single NPN transistor
with grounded emitter and a collector load and a resistor from base to
collector so the collector voltage is about half the supply voltage. I
understand the result would depend on the HFE of the transistor,
temperature, and maybe not very stable. Just wondering if LTSpice can
provide any interesting information for some particular transistor. DC
voltage change verses temperature.
-Bill