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From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: Transistor Switching
Date: Wed, 11 Sep 2002 11:20:19 GMT
NNTP-Posting-Date: Wed, 11 Sep 2002 04:20:19 PDT
Kevin Aylward wrote:
> "Chuck Simmons" wrote in message
> > Tim wrote:
> > >
> > > My electronics instructor demonstrated a transistor amplifier
> > > that had a small gain. He used a signal generator to apply
> > > a ac signal to the base. Later he mentioned something about
> > > a transistor oscillator than had a frequency of 20 KHz. He totally
> > > lost me. How can a bipolar transistor be configured to self
> > > oscillate at 20 KHz.
> > You only really need a gain of one or slightly more to make an
> > oscillator. Then the output is connected to the input with a circuit
> > that selects the desired frquency. You would be surprised at how often
> > this happens by accident. I don't know how much you know about AC
> > circuits so I can't detail an example. Except for a very unusual case,
> > single transistor oscillator will require at least an inductor and a
> > capacitor in addition to bias resistors. (Unless someone knows about
> > another exception not involving mechanical resonators.)
> Er... You can use a 3 stage RC from collector to base to make a single
> transistor oscillator.
Oops! forgot that one. The one I was thinking of is even simpler but I
haven't seen it in years.
... The times have been,
That, when the brains were out,
the man would die. ... Macbeth
Chuck Simmons firstname.lastname@example.org
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