Am 12.01.2016 um 22:34 schrieb Mal
Hamilton:
Wolf
What is the comparater chip u use
to conv 706 sine wave to sq wave
Mal/g3kev
an antique NE529 (in the *switching mode linear* as described on my
website). I only used it because it was in the junk box, but would
not recommend them for a new design if you had to order parts. The
three supply voltages are a plague, especially the negative 'analog'
supply. Use a modern rail-to-rail comparator with a few
nanoseconds, for example LT1016.
If I was to build such a PA again, I would now use a simple linear
regulator instead of the switching-mode DC modulator, since *most*
of the time the output amplitude is near 'full power' anyway.
Or use a dsPIC to provide the control signals for the RF driver and
the modulator instead of the 'mass grave' of digital gates.
73,
Wolf .
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