New idea sawtooth generator
sscprick at horus.sara.nl
Mon Jul 10 09:52:38 CEST 1995
I just had a new idea to get rid of the discharge time in
a sawtooth generator. Why not take TWO integrating capacitors
and switch the charging current and output for each half of
the wave. This way one capacitor gets linearly charged while
the other can be relatively slowly discharged. It sure will
be utterly discharged the moment the other integrator reaches
peak level. I propose to use 1% styroflex capacitors for this
purpose, which are easy to get.
Each integrator has its own comparator, one controlling the set,
the other controlling the reset of a flipflop. The Q and !Q of
the FF control some 4066 switches.
There's a gif of this in:
I hope switching of the charging current works with 4066 switches.
Usually the switching of currents is tricky, but it might work
in this case. The other thing is that there still is the reaction
time of the comparator/FF/switches. It can be compensated with a
potmeter for each comparator, but that may get difficult to adjust,
rick at sara.nl http://www.sara.nl/Rick.Jansen
S&H's a module and s&h's looking good
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