I thought you might like that.
-- My liberal friends think I'm a conservative kook. My conservative friends think I'm a liberal kook. Why am I not happy that they have found common ground? Tim Wescott, Communications, Control, Circuits & Software http://www.wescottdesign.com
Indeed! "Superannuated", that sure is a supercalifragilistic word for old fart >:-}
You want a thrill for the day... look up your own actuarial data. I'm
12 years to EOL per the actuarial tables, 18 years if I follow my Father's genetics, 3 years if I follow my Mother's (though that's unlikely... she died in a botched heart valve procedure.. never decide to have heart surgery done in Huntington, WV)....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.
It is not installed incorrectly.
What was biting me was perhaps the way I was driving the load on the low-side of the 2n3055 transistor. I moved the load to the high-side and changed the PNP transistor to source current from the 5V rail. Now there's lots of current to drive the base of the 2n3055. But there's only .2V developing across the thing.
2A, 17.4V from the p/s, 35W. The 2n3055 is only dissipating 400mA, so no wonder it's running cool. Basically, I detect that the transformer doesn't want to deliver more than 40W, so that's seems to be the limit here. 55W my ass.Regards,
Uncle Steve
-- There should be a special word in the English language to identify people who create problems and then turn around and offer up their own tailor-made bogus non-solutions designed to completely avoid the root causes of the situation under consideration. 'Traitor' might be a good choice, but lacks the requisite specificity. One of the problems with contemporary English is it lacks many such words that would otherwise categorically identify certain kinds of person, place, or thing -- making it difficult or impossible to think analytically about such objects. These shortcomings of the English lexicon are representative of Orwellian linguistics at work in the real world.
And perhaps a bit of a fiddle with some books or tutorials ??
So if I use a 338 and set it to supply 14V, and then drive the pnp from 18V the results might be better.
Maybe.
Regards,
Uncle Steve
-- There should be a special word in the English language to identify people who create problems and then turn around and offer up their own tailor-made bogus non-solutions designed to completely avoid the root causes of the situation under consideration. 'Traitor' might be a good choice, but lacks the requisite specificity. One of the problems with contemporary English is it lacks many such words that would otherwise categorically identify certain kinds of person, place, or thing -- making it difficult or impossible to think analytically about such objects. These shortcomings of the English lexicon are representative of Orwellian linguistics at work in the real world.
No it isn't. What you're seeing is an optical illusion that only makes you think it is oriented backwards.
I've got 400mA out of a 2n2907 at this time. No magic blue smoke yet.
Regards,
Uncle Steve
-- There should be a special word in the English language to identify people who create problems and then turn around and offer up their own tailor-made bogus non-solutions designed to completely avoid the root causes of the situation under consideration. 'Traitor' might be a good choice, but lacks the requisite specificity. One of the problems with contemporary English is it lacks many such words that would otherwise categorically identify certain kinds of person, place, or thing -- making it difficult or impossible to think analytically about such objects. These shortcomings of the English lexicon are representative of Orwellian linguistics at work in the real world.
A really sllloooooooowwwww microcontroller.
That makes a little more sense. Needless to say I want to get this right before doing anything non-trival with the microcontroller.
Regards,
Uncle Steve
-- There should be a special word in the English language to identify people who create problems and then turn around and offer up their own tailor-made bogus non-solutions designed to completely avoid the root causes of the situation under consideration. 'Traitor' might be a good choice, but lacks the requisite specificity. One of the problems with contemporary English is it lacks many such words that would otherwise categorically identify certain kinds of person, place, or thing -- making it difficult or impossible to think analytically about such objects. These shortcomings of the English lexicon are representative of Orwellian linguistics at work in the real world.
Wtf are you talking abt?
Jamie
I'm really completely uninterested in running anything Windows, even if I could run it in a HVM domain. I have better things to do with RAM.
Constant voltage at 13.1V ought to be fine, but then powering a 12V device from either 13.1 _or_ 12.8-12.2V is another matter. I have a precision voltage reference and an op-amp to make a calibrated 12V supply, but haven't got around to it yet.
The microcontroller running at 8MHz does 38400bps just fine with a little state-machine I bashed out on Monday. It would do 115200, but the interrupt vectors live in flash so I can't change them at run-time, hence there's a 39 cycle register save/restore penalty I can't seem to get rid of or reduce. If I did it in ASM it might be doable, but C is so much easier. Damn you Atmel; damn you GCC!
Regards,
Uncle Steve
-- There should be a special word in the English language to identify people who create problems and then turn around and offer up their own tailor-made bogus non-solutions designed to completely avoid the root causes of the situation under consideration. 'Traitor' might be a good choice, but lacks the requisite specificity. One of the problems with contemporary English is it lacks many such words that would otherwise categorically identify certain kinds of person, place, or thing -- making it difficult or impossible to think analytically about such objects. These shortcomings of the English lexicon are representative of Orwellian linguistics at work in the real world.
-- Dunno. Post a schematic.
Play all the games you wish, and keep twisting the post around.
Jamie
Give me a break. All those little symbols look the same to me.
Regards,
Uncle Steve
-- There should be a special word in the English language to identify people who create problems and then turn around and offer up their own tailor-made bogus non-solutions designed to completely avoid the root causes of the situation under consideration. 'Traitor' might be a good choice, but lacks the requisite specificity. One of the problems with contemporary English is it lacks many such words that would otherwise categorically identify certain kinds of person, place, or thing -- making it difficult or impossible to think analytically about such objects. These shortcomings of the English lexicon are representative of Orwellian linguistics at work in the real world.
-- You have no idea, do you?
17.4V into 10 ohms is going to give you 1.74A. That's not the transformer being "unwilling", that's you failing to load it down enough.
-- Tim Wescott Control system and signal processing consulting www.wescottdesign.com
Why? He's got 5 ua max to the base of the 2N2222.
Ed
I made some changes to your circuit to make it a current and voltage limited source with a maximum current of 3 amps and a maximum voltage of about
6.6 volts. The OP's circuit as you interpreted it with LTspice is just a switch with no regulation of current or voltage, and could be accomplished with a simple switch or relay. I performed a parametric sweep of the load resistance from 0.5 to 6.0 ohms. The circuit is far from optimum but it performs the function of a linear battery charger.For a screenshot of the simulation:
Paul
========================= ========================= ==========
Version 4 SHEET 1 1592 708 WIRE -16 0 -192 0 WIRE 96 0 -16 0 WIRE 176 0 96 0 WIRE 320 0 272 0 WIRE 544 0 400 0 WIRE 624 0 544 0 WIRE 656 0 624 0 WIRE -16 64 -16 0 WIRE 224 96 224 64 WIRE 352 96 224 96 WIRE 464 96 416 96 WIRE 544 96 544 0 WIRE 544 96 528 96 WIRE 96 176 96 0 WIRE 224 176 192 176 WIRE 544 272 544 96 WIRE 544 272 448 272 WIRE 656 272 656 0 WIRE -16 288 -16 144 WIRE 144 288 144 240 WIRE 144 288 -16 288 WIRE 144 304 144 288 WIRE -192 352 -192 0 WIRE -80 352 -192 352 WIRE 352 352 64 352 WIRE 448 352 448 336 WIRE 144 400 144 384 WIRE 352 416 352 352 WIRE -80 448 -80 352 WIRE -32 448 -80 448 WIRE 64 448 64 352 WIRE 64 448 48 448 WIRE 80 448 64 448 WIRE 448 464 448 432 WIRE 448 464 416 464 WIRE -192 480 -192 352 WIRE -192 624 -192 560 WIRE 144 624 144 496 WIRE 144 624 -192 624 WIRE 352 624 352 512 WIRE 352 624 144 624 WIRE 656 624 656 352 WIRE 656 624 352 624 WIRE -192 688 -192 624 FLAG -192 688 0 FLAG 624 0 out SYMBOL npn 176 64 R270 WINDOW 0 68 29 VRight 2 WINDOW 3 99 3 VRight 2 SYMATTR InstName Q1 SYMATTR Value 2N3055 SYMBOL npn 80 400 R0 SYMATTR InstName Q3 SYMATTR Value 2N2222 SYMBOL res 640 256 R0 WINDOW 3 36 68 Left 2 SYMATTR InstName R1 SYMATTR Value {RVAL} SYMBOL voltage -192 464 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 18 SYMBOL res 64 432 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 2.7k SYMBOL pnp 192 240 M270 WINDOW 0 61 61 VLeft 2 WINDOW 3 92 86 VLeft 2 SYMATTR InstName Q2 SYMATTR Value 2N2907 SYMBOL res 432 336 R0 SYMATTR InstName R2 SYMATTR Value 100 SYMBOL res 128 288 R0 SYMATTR InstName R4 SYMATTR Value 1k SYMBOL res 416 -16 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R5 SYMATTR Value 0.25 SYMBOL zener 464 336 R180 WINDOW 0 24 64 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D1 SYMATTR Value BZX84C6V2L SYMATTR Description Diode SYMATTR Type diode SYMBOL diode 352 80 M90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D2 SYMATTR Value MURS120 SYMBOL diode 464 80 M90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D3 SYMATTR Value MURS120 SYMBOL res 208 80 R0 SYMATTR InstName R6 SYMATTR Value 47 SYMBOL npn 416 416 M0 SYMATTR InstName Q4 SYMATTR Value 2N2222 SYMBOL res 0 160 R180 WINDOW 0 36 76 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName R7 SYMATTR Value 2.7k TEXT -176 656 Left 2 !;tran 1 TEXT 704 256 Left 2 !.step param RVAL 0.5 6.0 1\n.op
-- "Nazi" would be a better choice, I think, since it seems to meet your criteria. --- >One of the problems with contemporary English is it lacks many such words that would >otherwise categorically identify certain kinds of person, place, or thing -- making it >difficult or impossible to think analytically about such objects.
Nazi is like 'traitor', but the idea that National Socialism was a false flag operation is amusing.
that would >otherwise categorically identify certain kinds of person, place, or thing -- making it >difficult or impossible to think analytically about such objects.
The point I am attempting to make, perhaps badly, is that there are certain ideas about behaviour which lack descriptive and unique identifiers. This makes it more diffucult to think about such things, indeed if the inclination to do so ever arises.
Just did.
Regards,
Uncle Steve
-- There should be a special word in the English language to identify people who create problems and then turn around and offer up their own tailor-made bogus non-solutions designed to completely avoid the root causes of the situation under consideration. 'Traitor' might be a good choice, but lacks the requisite specificity. One of the problems with contemporary English is it lacks many such words that would otherwise categorically identify certain kinds of person, place, or thing -- making it difficult or impossible to think analytically about such objects. These shortcomings of the English lexicon are representative of Orwellian linguistics at work in the real world.
As I recall the op wanted to control the charger with the output from a microprocessor, John's circuit allows. If I understand the OP's position, he already has the voltage and current sensing and control designed in his up.
Ed
-- Not to the survivors, I daresay.
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