LF: Tuesday's riddle (part 2)

To:	[email protected]
Subject:	LF: Tuesday's riddle (part 2)
From:	"Rik Strobbe" <[email protected]>
Date:	Wed, 13 Nov 2002 13:35:23 +0100
In-reply-to:	<[email protected]>
Reply-to:	[email protected]
Sender:	<[email protected]>

Hello Marcus,

very interesting.
I did the experiment with a BC547c and as Andy I got a negative voltage.
While playing with it I reduced the voltage to +/- 5V and saw an even more interesting effect, over a range of a few 10mV I got a nice sawtooth signal. I wonder if someone can reproduce it ...

73, Rik ON7YD

At 14:58 11/11/2002 -0500, you wrote:

Hi group,

this little experiment was pointed out to me by Ralph, DL2NDO a few years ago:

You need an ordinary NPN transistor (eg. 2N2222), a 9V battery, a 1k resistor and a voltmeter. Connect the negative battery terminal to the base and the positive to the emitter, via the resistor. Now predict the voltage drop between collector and base. Can't be too hard...

Then measure it - you'll be surprised. Any explanations? We finally ended up opening the poor transistor's case.

Have fun
Markus, DF6NM

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