pH meter (CB21196E)

This circuit was found in documentation from Analog Devices. The circuit is based on an AD795 and a commercial pH probe.

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Filter analyzer (CB8227E)
Found in a 90s Popular Electronics, this circuit is interspersed between the filter and the...
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This circuit is from an 80's documentation. The integrated circuit is from the time and the...
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This circuit was found in a 80s American documentation. The zener diodes determine the points of...