Heart Beat Monitor Sensor Circuit diagram : Here is a simple and low-cost cir-cuit of heart beat monitor using readily available components. It uses the piezo electric plate of audible piezobuzzers as the sensing device, which can be purchased for around Rs 2 only from component vendors. The sensor is pressed against human body near the heart region. It should make a solid contact with your palm to convert heart beat sound into low-frequency electrical variations. These electrical variations are amplified by transistor T1 that is configured as a common-emitter amplifier. Amplified signals are coupled to tran sistor T2 for driving the audio power amplifier stage. The speaker reproduces heart beat notes as audible sound.
Heart Beat Monitor Sensor Circuit diagram :
Heart Beat Monitor Circuit-Diagram
The two BEL188 silicon transistors used in the power output stage are freely available. In case you use AC188/128 germanium transistors in place of BEL188 silicon transistors, replace 220-ohm resistors with 47-ohm resistors and 680-ohm resistors with 1-kilo-ohm resistors.
Author : Pradeep G. - Copyright : EFY
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