Negative resistance with BJTs

Aug 22, 2018 54 Replies

behavior of pentodes was called the "phantastron". It was widely used in radar and scopes and timing circuits."

I wish my Uncle was alive so I could ask about that. He used to work on RADAR in the air force. Electronics was his MOS (?) and later he was a tech specialist with IBM.

Well there you go, I don't learn something unless I step in it. No matter how many times you tell me.

George H.

I believe MOS is the correct term for Military Occupational Specialty.

Could be. Lots of folks survive heart attacks, though.

Cheers

Phil Hobbs

Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com

Sure but you can't help it if it comes while you're driving. I knew a guy who died that way, who might have survived if it happened in the office.

And you know this, how?

None of the articles I've ever seen, or have been able to find, identified the cause of the accident. Some reports said the CHP was investigating but I have been unable to find any public report on their actual findings. It appears that in California, one must be an "interested party" in the legal sense to be able to receive a copy of a police report concerning an accident.

So, krw, are you speaking from direct knowledge, some authoritative reference that others can see, rumor, or personal opinion?

Or in a car with air bags, crumple zones, and a rigid passenger compartment--IOW anything made in the previous 15 years or so. The old Beetle was a deathtrap.

Cheers

Phil Hobbs

Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com

The guy I knew had a new car. But in any case it doesn't mean Pease wasn't qualified to write a book on driving. He was just too much in love with that car.

People in the know. He was a well known drunk.

Especially when you don't wear a seat belt.

John Larkin Highland Technology, Inc lunatic fringe electronics

I did this 2-teminal version with one transistor sometime in 2005. Version 4 SHEET 1 880 680 WIRE 96 64 48 64 WIRE 208 64 96 64 WIRE 304 64 208 64 WIRE 96 96 96 64 WIRE 208 112 208 64 WIRE 304 128 304 64 WIRE -32 144 -32 64 WIRE -32 144 -96 144 WIRE 32 144 -32 144 WIRE 96 208 96 192 WIRE 96 208 -96 208 WIRE 208 208 208 192 WIRE 208 208 96 208 WIRE 304 208 304 192 WIRE 304 208 208 208 FLAG -96 144 In IOPIN -96 144 In FLAG -96 208 In IOPIN -96 208 In SYMBOL diode 288 128 R0 SYMATTR InstName D1 SYMATTR Value 1N4007 SYMBOL voltage 208 96 R0 WINDOW 3 -47 135 Left 2 SYMATTR InstName Vm SYMATTR Value Rm=16.3K SYMBOL npn 32 96 R0 SYMATTR InstName Q1 SYMATTR Value TIP50 SYMBOL res -48 80 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R1 SYMATTR Value 3.58K TEXT -112 176 Left 2 ;Vin TEXT -88 272 Left 2 ;2-terminal negative resistance\n used for meter protection.\n (plot Vm VS Vin)

Also at DC, see my posting in this thread.

But I am le tired.

Alright go take a nap ZEN PUT ZE BEADS ON ZE LEADS!!!

(To paraphrase an old video)

Tim

Seven Transistor Labs, LLC Electrical Engineering Consultation and Design Website: https://www.seventransistorlabs.com/

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required