PH meter (CB20731E)

This circuit was obtained in an old American documentation. The integrated circuit used is uncommon today. Modern equivalents can be searched.

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Supply for photo multiplier tube (CB8123E)
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This circuit was found in the 1991 Electronics Experimenters handbook. It can be used to display RGB...
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This sinusoidal oscillator was found in Radio Electronics in 1989. It uses a 741, but other...