John Larkin's LC oscillator
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From: Tim Reede on 13 Jun 2010 10:57 "Jasen Betts" <jasen(a)xnet.co.nz> wrote in message news:hv2a6p$lhn$1(a)reversiblemaps.ath.cx... > > After running the sim point at the component you want to > see current through and the cursor should change to look like a black > clamp meter > instead of a red probe. > > It only works on components, for devices with more than 2 terminals > you have to get the joint between the dark blue component and the > light blue interconnect wiring. > > Or you can hold the [Alt] key down and it'll do current instead of > voltage on the wires, and a thermometer looking thing (which I haven't > figured out how to use) on the components > The thermometer looking thing displays the power dissipation in the component. Especially for power electronics it's often a good reality check as to whether the circuit is likely to keep the magic smoke in the real world. It works well for resistors, bipolar transistors and MOSFETs. It also works reasonably well for some LTC opamps, though I wouldn't trust it with active devices that have models of questionable reasoning, such as opamps that will pull electrons out of thin air with no regard to their own neither their power supplies' capabilities.
From: John Larkin on 13 Jun 2010 11:29 On 13 Jun 2010 09:59:53 GMT, Jasen Betts <jasen(a)xnet.co.nz> wrote: >On 2010-06-12, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >> On Sat, 12 Jun 2010 08:53:20 +0100, John Devereux >><john(a)devereux.me.uk> wrote: >> > >>>> It's useful to add a small resistor, like 1 milliohm, in the emitter >>>> so that you can probe the current. It's interesting. >>> >>>Hi John, >>> >>>You don't need to add the the resistor. You can just measure the emitter >>>current by clicking on it! >>> >> >> I couldn't get that to work. Maybe my aim isn't good enough. > >After running the sim point at the component you want to >see current through and the cursor should change to look like a black clamp meter >instead of a red probe. > >It only works on components, for devices with more than 2 terminals >you have to get the joint between the dark blue component and the >light blue interconnect wiring. > >Or you can hold the [Alt] key down and it'll do current instead of >voltage on the wires, and a thermometer looking thing (which I haven't >figured out how to use) on the components The alt thing is cute, if I can remember it. Thanks. John
From: JosephKK on 13 Jun 2010 14:33 On Sun, 13 Jun 2010 01:28:47 -0300, YD <ydtechHAT(a)techie.com> wrote: >Late at night, by candle light, John Larkin ><jjlarkin(a)highNOTlandTHIStechnologyPART.com> penned this immortal >opus: > >>On Sat, 12 Jun 2010 19:38:42 -0300, YD <ydtechHAT(a)techie.com> wrote: >> >>>Late at night, by candle light, John Larkin >>><jjlarkin(a)highNOTlandTHIStechnologyPART.com> penned this immortal >>>opus: >>> >>>>On Sat, 12 Jun 2010 08:53:20 +0100, John Devereux >>>><john(a)devereux.me.uk> wrote: >>>> >>>>>John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> writes: >>>>> >>>>>> On Fri, 11 Jun 2010 17:43:39 -0300, YD <ydtechHAT(a)techie.com> wrote: >>>>>> >>>>>>>Late at night, by candle light, John Larkin >>>>>>><jjlarkin(a)highNOTlandTHIStechnologyPART.com> penned this immortal >>>>>>>opus: >>>>> >>>>>[...] >>>>> >>>>>> >>>>>> That's nice. It's running pretty hard class C. >>>>>> >>>>>> Try this: >>>>>> >>>>>> C2 = 10 uF >>>>>> L2 = 0.25 uH >>>>>> >>>>>> That will move it to class A, with about 50 millivolts p-p drive at >>>>>> the emitter. That's more like what I had in mind originally. Vb is >>>>>> stiff at about +0.6, and Vc dips down to about -0.1, a little below >>>>>> Ve, sucking a brief blip of current out of the base cap. The sine wave >>>>>> is just slightly flattened on the bottom. >>>>>> >>>>>> It's useful to add a small resistor, like 1 milliohm, in the emitter >>>>>> so that you can probe the current. It's interesting. >>>>> >>>>>Hi John, >>>>> >>>>>You don't need to add the the resistor. You can just measure the emitter >>>>>current by clicking on it! >>>>> >>>> >>>>I couldn't get that to work. Maybe my aim isn't good enough. >>>> >>>>John >>>> >>> >>>Just hover the pointer over the terminal until it looks like a >>>clampmeter. One of those things I found quite by accident, and nicely >>>surprised. >>> >> >>I know that, but I had a hard time hitting the emitter current. The >>resistor is a bigger target. Maybe I should buy more pixels or >>something. >> >>John > >Yeah, the "sensitive" area is quite small, apparently only a few >pixels across. Another way is to use a 0 V source instead of the >resistor, then you can be sure of polarity too. I recall doing that in >some ancient SPICE from the DOS daze. > >- YD. Yep. I learned that back when i used Intusoft DOS SPICE 1.41. It was in their book back then.
From: JosephKK on 13 Jun 2010 14:47 On Sat, 12 Jun 2010 20:31:02 +1000, Grant <omg(a)grrr.id.au> wrote: >On Fri, 11 Jun 2010 16:02:58 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >>On Fri, 11 Jun 2010 15:37:52 -0700, BlindBaby >><BlindMelonChitlin(a)wellnevergetthatonethealbumcover.org> wrote: >> >>>On Sat, 12 Jun 2010 08:07:41 +1000, Grant <omg(a)grrr.id.au> wrote: >>> >>>>On Fri, 11 Jun 2010 08:16:29 -0500, John Fields <jfields(a)austininstruments.com> wrote: >>>> >>>>>On Fri, 11 Jun 2010 07:02:03 -0500, John Fields >>>>><jfields(a)austininstruments.com> wrote: >>>>> >>>>>>On 10 Jun 2010 13:23:55 -0700, Winfield Hill >>>>>><Winfield_member(a)newsguy.com> wrote: >>>>>> >>>>>> >>>>>>> In a ringing bell application, as the supply voltage sags, >>>>>>> and the amplitude drops, I imagine the circuit will move >>>>>>> from class C back to class A operation, before stopping. >>>>>> >>>>>>--- >>>>>>Why imagine? >>>>>> >>>>>>Here's a circuit list that'll show it all _and_ it'll create a .wav >>>>>>file, "bong.wav" in whatever folder the cicuit's in, so you can hear >>>>>>it. >>>>>> >>>>>>Enjoy! :-) >>>>> >>>>>--- >>>>>Oops... >>>>>Here it is: >>>> >>>>Sounds wonderful! There's so much I don't know about what LTSpice >>>>can do :( More examples that load and work as advertised, the better :) >>>> >>>>Grant. >>> >>> >>> LTSpiceIV just came out today! >>> >>>http://www.linear.com/designtools/software/switchercad.jsp >> >> >>I've been running 4.07 for a couple of weeks now. > >Mine updated itself a while back, just checked --> 4.07. > >Grant. I found that i had the help file open and that was interfering with the update. All sweet now.
From: Archimedes' Lever on 13 Jun 2010 15:04
On 13 Jun 2010 10:19:10 GMT, Jasen Betts <jasen(a)xnet.co.nz> wrote: >On 2010-06-13, JosephKK <quiettechblue(a)yahoo.com> wrote: > >> The sim runs but i cannot find the wave file. Where do you think it gets >> put when in wine? > >On mine I found it in the same directory as the asc file. > > >--- news://freenews.netfront.net/ - complaints: news(a)netfront.net --- I still think it is related to how one has their individual wine session set up. You location is where it should be. I assumed that he had read that notation and already looked there. Ithas to be writing the log file etc somewhere successfully. |