"H.C. Croon" writes:
>I would ask your attention for the 74HC4316, made by Philips and the
>M74HC4316 made by SGMicroelectronics. I have the idea the SGM has a
>little bit beter specs. Their advantage is that they switch signals
>which are symmetrical to ground, without the need to change the
>level. The supply voltages are + and - 6.5V max. (+ and -6V
>recommended)
Many thanks, also. Choppers are interesting circuits to play
with in electronics because they can turn DC signals in to AC which
can then be amplified as AC and then turned back in to DC if desired
by running the signal through another chopper synchronized to the
first. I believe that some extremely high gain low-voltage DC
amplifiers use this principle to avoid the problem of the offset null
drifting.
Years ago, it was also popular to use choppers, first
electromechanical, then electronic FET-driven circuits to turn DC in
to an audible signal.
The American Foundation for the Blind used to sell a DC
multimeter that had a Wheatstone Bridge which fed a chopper that ran
at about 300 HZ. The output of the chopper was clipped to accentuate
the null, and fed to a small amplifier and speaker.
If you were using such a multimeter, you turned the knob on
the face to balance the bridge which caused the tone to null out.
Martin McCormick WB5AGZ Stillwater, OK
OSU Information Technology Division Network Operations Group
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Author: Martin McCormick
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