The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: "Marc H.Popek"
Subject: Re: amplifiers high gain low current
X-Newsreader: Microsoft Outlook Express 5.50.4133.2400
X-MIMEOLE: Produced By Microsoft MimeOLE V5.50.4133.2400
Date: Wed, 18 Sep 2002 17:17:30 GMT
NNTP-Posting-Date: Wed, 18 Sep 2002 17:17:30 GMT
Organization: AT&T Worldnet
Use discrete components! Actually DESIGN the multistage amplifier, just like
you learned in class. All the things you learned are true :-) Bias the
first stage Jfet (optimized for high Zin), couple to an intermediate gain
stage, BJT, and then decide on your output strategy. Class A for simplistic
low lower drive OR class AB for a more efficient higher power output level.
Draw out the system block diagram using the characteristic amplifier metrics
( Rin, Rout, Gv) as a start. Examine the signal levels as it propagate
through the chain, now add Vssi ( small signal threshold) analysis to insure
that one of the stages doe not saturate "too soon".
Implement each block into an amplifier.......
Professor :-) Marc
"Samuel Kristanto" wrote in message
> My name is Samuel, I have a problem with my final project.
> I have a power supply that step up from battery 3V to 50V(10mA)--> I
> use boost regulator from Mic2570-2BM.
> Now I have to make an amplifier using the output from my soundcard to
> the input of my amplifiers, I want to use maybe an OP-AMPS but its
> very difficult to find the OP-AMPS that fit with 50V and need better
> power than 500mW. Please help me to solve this amplifiers problem.
> please reply me at : email@example.com
> Thanks a lot
> Samuel Kristanto
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup