Search found 8 matches

by plupo
Tue Sep 12, 2017 5:19 pm
Forum: The Peabody Lounge
Topic: "The View from Chaos Manor" RIP Jerry Pournelle
Replies: 2
Views: 3339

Re: "The View from Chaos Manor" RIP Jerry Pournelle

Great respect for the man !I returned to Italy from Seattle in the '84 with a clear idea: have a Byte subscription at home and read Chaos Manor.
RIP Jerry and put a LAN down there !
by plupo
Sun Jul 30, 2017 3:10 am
Forum: Document
Topic: Bootstrapped Op Amp Articles
Replies: 33
Views: 37418

Re: Bootstrapped Op Amp Articles

Thank JR , yeah darlingtons are not nice guys, those are out of a sort of lazy behavior I have in counting" how many soldering I have to do today". Clearly developed when I was young, but hard habit to fight, so i still go for the lower part count the better. Anyway , the correct biasing is hard in ...
by plupo
Fri Jul 28, 2017 5:50 pm
Forum: Document
Topic: Bootstrapped Op Amp Articles
Replies: 33
Views: 37418

Re: Bootstrapped Op Amp Articles

"I have one example where the output devices are coupled to the driver by LED/Solar cells. I should scan it. I think it had a 1 kV range."
Mediatechnology


the 4N35 are fairly linear in some way and are deadly cheap

PL
by plupo
Fri Jul 28, 2017 5:43 pm
Forum: Document
Topic: Bootstrapped Op Amp Articles
Replies: 33
Views: 37418

Re: Bootstrapped Op Amp Articles

The evergreen Jim Williams always gives some useful tips: i've read almost anything from him and Pease too. What I have to learn from that article is to avoid my habit to use monolithic darlingtons, that narrows the range of devices available. What i don't like is to have emitter outputs: in case of...
by plupo
Fri Jul 28, 2017 10:12 am
Forum: Document
Topic: Bootstrapped Op Amp Articles
Replies: 33
Views: 37418

Re: Bootstrapped Op Amp Articles

That is exactly the configuration I use all the time: sometimes is good go through the PS lines, but in case of very fast amps is better to take the current out of the collectors of two followers PNP NPN connected at the output of the OPAMP so that you don't include in the path the idle current of t...
by plupo
Thu Jul 27, 2017 2:30 pm
Forum: Document
Topic: Bootstrapped Op Amp Articles
Replies: 33
Views: 37418

Re: Bootstrapped Op Amp Articles

well... what can I say if not "thank to this forum !" couple of days i'm in and you all went up with plenty of tricks. FYI the 20 mSec 100W amp was probably copied after you by a HiFi power amp on a magazine quite popular in the mid '80 in Italy: today there' plenty of caps' pumping for Cmos gate dr...
by plupo
Thu Jul 27, 2017 9:54 am
Forum: Document
Topic: Bootstrapped Op Amp Articles
Replies: 33
Views: 37418

Re: Bootstrapped Op Amp Articles

Thank JR for the reply. I was referring to one of the designs that had a non inverting input and a usual opamp feedback configuration (with gain) That was misleading, as well as the first one, with a grounded positive input: clearly shifting the PS will do the job, but then everything is bootstrappe...
by plupo
Thu Jul 27, 2017 8:27 am
Forum: Document
Topic: Bootstrapped Op Amp Articles
Replies: 33
Views: 37418

Re: Bootstrapped Op Amp Articles

Dears I'm quite new on this forum, full with interesting stuff, however this "boosted opamp" series of articles are showing since the start an input positive node that can swing more than the absolute maximum rating vs the power supplies of the OPAMP itself , and you know this' no good. Those schema...