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 circuit give protection from inadvertent applications of defibrillation pulses while patient is being monitored. The datasheet of this IC stated that the isolation is tested with 8000 Volts source. This circuit uses carbon-composition types resistors. Here is the schematic diagram of the circuit: