Averager and Peak Hold/Extender Signal Conditioner

A signal averager circuit can be formed by an amplifier and active signal rectifier, which is implemented using two operational amplifiers in this circuit. The first op-amp is configured as inverting amplifier and the second forms an active half-wave rectifier. The half cycle signal is then filtered by an RC (resistor-capacitor) filter to get the average value. The gain of […]

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Digital pH Meter Signal Conditioner with Pulse/Frequency Output

A signal conditioner for pH meter probe is required to have high input impedance. The signal conditioning of the pH meter probe is done by providing a buffer with gain, offset, and volatge to frequency converter. High input impedance requirement for pH probe while maintaining low cost constraint is given by 3130 CMOS opamp. Output of probe, is amplified by […]

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Heart Monitor (ECG Sensor Signal Amplifier/Conditioner)

Using the circuit depicted in the schematic diagram below we can monitor the heart pulses of patient. This circuit buffer and amplify the heart pulses, and the amplification bandwidth ranges from DC to 3 kHz. For the core of the isolation, a Burr-Brown BB3656 isolation amplifier integrated circuit (IC) is used in this circuit. With internal transformer inside, this integrated […]

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