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Re: Ideas for Design ;-)

"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...

There are _much_ simpler ways to implement absorbing the Q-bias of the > TL431 without using an auxiliary supply... think about it... 10 > seconds max allowed ;-)

OK, I exceeded my 10 seconds. Hint, please?

Discrete 4000 series logic? That IS a true knee-slapper ;-)

That one looks a lot like homework assignments from Digital Logic 101, where you demonstrate that you just need, e.g., AND/OR/NOT and you can build any arbitrary logic function. Still, the guy's in India, working at a steel plant, so I'm not surprised that he perhaps thinks his design is rather more novel than it really is.

At work we use a bunch of Fairchild NC7SZ57 and NC7SZ58 "universal logic gate" parts so that we don't have to stock as many different components.

---Joel

Reply to
Joel Koltner
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Could be as simple as a single resistor in parallel with the LED... depending on the softness of the V-I plot for an LED. Other add a PNP transistor and two resistors. Final form left as an exercise for the student ;-)

What is surprising is that ED Magazine's editors thought it novel enough to publish it. Based of stuff I've seen there previously, they may be hard up trying to find submissions ;-)

I just enter whatever I want at device level onto the schematic. Although the foundry for my present project has a fairly complete library of parts I just plunk down on my schematic ;-)

...Jim Thompson

--
| James E.Thompson, P.E.                           |    mens     |
| Analog Innovations, Inc.                         |     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

"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...

Ah, I think I've got it. Definitely simpler than adding another power supply.

Lucky man!

---Joel

Reply to
Joel Koltner

Just need NOR

or just NAND.

Reply to
flipper

Much better stated and useful than what I said; thanks Flipper.

Reply to
Joel Koltner

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Actually, the P fets are not the "not' of the N fets. Seems like B high and C low crowbars the the supply.

Reply to
miso

Come on now Miso, You done gone and divulged the secret fuse blower function ;-)

...Jim Thompson

--
| James E.Thompson, P.E.                           |    mens     |
| Analog Innovations, Inc.                         |     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

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There are not a lot of CMOS gates that are not duals regarding P and N, so this circuit got on my radar. I quit at the first short, but there could be more. Off the top of my head, I think the gated inverter is the only logic circuit where the P fets are not the not of the N fets. Well, for static logic at least. Also one type of Schmidt trigger comes to mind. [I prefer the dualing inverter Schmidt trigger, but there is that circuit where you jam current between series devices.]

Reply to
miso

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