21 Dec
2007
21 Dec
'07
8:21 a.m.
From: mcguire at neurotica.com
Date: Fri, 21 Dec 2007 08:52:06 -0500
To: cctech at classiccmp.org
CC:
Subject: Re: The 2N2/256-BSCP [was: Homebrew Drum Computer]
On Dec 21, 2007, at 2:07 AM, dwight elvey wrote:
Hi
To better approximate a tunnel diode, you'd have
to put a resistor in parallel. I don't recommend doing
this as it only degrades the negative resistance.
Still, if one was to use a pair of these for a flop, it
might be more stable since at the higher voltages,
unlike a real TD, it completely shuts off. Without the
shunt resistors to bypass some current the circuit
might oscillate.
Dwight
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As a cheaper alternative to a tunnel diode, do a
search for
a Lambda Diode. I used one of these circuits once to make an
oscillator that ran at over 100MHz.
Oh my, there IS an almost-equivalent-to-a-tunnel-diode circuit!
That looks really, really neat...I will have to play with that!