Looking for Transistor based Gyrator info. Any "Wireless World" collectors out there?

[Hearinspace]

I'm trying to find detailed design information on Transistor based Gyrators but web searches turn up very little.
I did find some references to articles and I'm wondering if anyone has either of:

Electronics World and Wireless World, May 1992

Wireless World, Feb 1967

and also

Electronics Letters, Vol. 3, No. 2, Feb 1967

and if so could you be persuaded to post a scan?

Thanks for any and all help.

[tinears02]

http://www.corybas.com/Papers/Publications.htm

[scott wurcer]

Wow, the three-legged op-amp dates back to 1967 (probably before).

[Hearinspace]

yeah, the earliest Gyrator reference I've found so far is
Tellegen, B.D.H., "The Gyrator, a New Electric Network Element," Philips Research Reports, Vol. 3, No. 2, Apr 1948 !

. . . .but coming up with the actual articles is another story. IEEE Explore has a lot of them locked up.

[Pjotr]

Originally posted by scott wurcer
Wow, the three-legged op-amp dates back to 1967 (probably before).

Yes, in the early '60-ties Analog Devices did put complete differential amplifiers made of discrete components in small potted black boxes. These were intended for use in the “Analog Computers” of those days. I think Anolog Devices was it that called them “Operational Amplifier” because they were ready to use on an analog computer bread board.

[scott wurcer]

Originally posted by Pjotr


Yes, in the early '60-ties Analog Devices did put complete differential amplifiers made of discrete components in small potted black boxes. These were intended for use in the “Analog Computers” of those days. I think Anolog Devices was it that called them “Operational Amplifier” because they were ready to use on an analog computer bread board.

Ooops, foiled by my own jokes. I was referring to the input stage with three outputs the middle one is common mode feedback, the picture is buried in that link somewhere.

[The Electrician]

Originally posted by Hearinspace
yeah, the earliest Gyrator reference I've found so far is
Tellegen, B.D.H., "The Gyrator, a New Electric Network Element," Philips Research Reports, Vol. 3, No. 2, Apr 1948 !

. . . .but coming up with the actual articles is another story. IEEE Explore has a lot of them locked up.

I have a .pdf of Tellegen's paper. Post an email address, and I'll send it to you (it's about 1.7 megabytes). You might want to doctor the email address so the spammers can't harvest it.

[forr]

Hi Hearinspace,

I have this one :

"The inverted world of gyrators"
by Dr C.O. Anazia
Electronics World and Wireless World, May 1992, pp414-417
Just the time to scan it.


Maybe the following ones would interest you too :

"Negative resistance in AF filters"
by John Dent
Electronics World + Wireless World, December 1989, pp1203-1207

"Lower THD form vintage designs"
(FDNR circuits)
by Rick Downs (EDN designers companion)
Electronics World, January 1995, pp52-54.

Another reference but I do not have the text :
"Modeling of a gyrator circuit"
by A. Antoniou
Wireless World, September 1973.

Email me.

[poynton]

What about this :?

http://www.epanorama.net/documents/telecom/gyrator.html


Andy

[Hearinspace]

Originally posted by poynton
What about this :?
http://www.epanorama.net/documents/telecom/gyrator.html
Andy

Hi Andy,
Thanks!
That's an appealing circuit but I like to learn how to make something I can use for high bandwidth and more current and the drop across that (47 Ohm) series resistor makes for a loss I'd rather do without. I'm guessing that whatever it is will have to use more than one transistor.
This is all coming out of Rod Coleman's filament supply and it has me interested in learning more about Gyrators in general. On a search I did a while back I found a couple of older articles that put the capacitance multiplier in the Gyrator category - but as the Gyrator is called an impedance inverter (ie. use C as L or L as C) I think that might be argued. Anyway, the whole thing's is fascinating and I'd like to learn more. . . .


Hey Pjotr!
First use of "Operational Amplifier" was in 1947 !