Summary of DSPIC30F2012 ELECTRONIC STETHOSCOPE AMPLIFIES
This article describes an electronic stethoscope project using the dsPIC30F2012 microcontroller. It utilizes the MCP6S26 Programmable Gain Amplifier to suppress microphone noise and handle temperature signaling, while the MCP6022 op-amp serves as a four-pole active filter for anti-aliasing. The system also includes a three-pole filter with the MCP608, a digital potentiometer (MCP4011), an LM386 audio amplifier, a digital display, and an LF50 power supply.
Parts used in the DSPIC30F2012 Electronic Stethoscope:
- Programmable Gain Amplifier – MCP6S26
- Four pole active filter – MCP6022
- Core – dsPIC 30F2012
- 3 pole active filter – MCP608
- Digital Potentiometer – MCP4011
- Audio amplifier – LM386
- Digital display
- Power supply – LF50
Programmable Gain Amplifier – MCP6S26; Microchip’s PGA, MCP6S26, is misused to dynamically suppress microphone realise and to multiple temperature device signaling to ADC manoeuvre of the set. This PGA is configured to jazz acquire 1 at DC and s/w… Electronics Projects, dsPIC30F2012 electronic stethoscope amplifies “dspic projects, microchip projects, microcontroller projects,
Programmable Gain Amplifier – MCP6S26; Microchip’s PGA, MCP6S26, is misused to dynamically suppress microphone realise and to multiple temperature device signaling to ADC manoeuvre of the set. This PGA is configured to jazz acquire 1 at DC and s/w manageable advance for AC signaling. This mixed get mode is achieved by bypassing VREF pin to primer thru a capacitance (C32). This capacitance book as brief for AC sign effectively attachment the VREF pin thereby providing wax as per turn show worth. During unfluctuating tell DC signaling this capacitance acts as afford circuit thereby signaling selection. Author: Sivakumar Govindarajan
Digit tangency agile strain – MCP6022
Microchip’s Rail-to-Rail dual op-amp, MCP6022, is old as quick filter to bound the sign signalise bandwidth and to engage anti-aliasing filter purpose. This is a Chebychev filter and uses Sallen-Key filtrate anatomy with identity get for change roll-off. This filter is designed with the serve of Semiconductor’s Strain Lab. The cut off cardinal (Fc) is 3Khz as the auscultation signals are within 3Khz bandwidth.
Hardware Design
Please refer Appendix A for complete schematic.There are fundamentally eight blocks in this system
1. Programmable Gain Amplifier – MCP6S26
2. Four pole active filter – MCP6022
3. Core – dsPIC 30F2012
4. 3 pole active filter – MCP608
5. Digital Potentiometer – MCP4011
6. Audio amplifier – LM386
7. Digital display
8. Power supply – LF50
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Source: DSPIC30F2012 ELECTRONIC STETHOSCOPE AMPLIFIES
- How does the MCP6S26 suppress microphone noise?
The MCP6S26 is configured to acquire DC signals at a gain of 1 and uses software-managed gains for AC signaling by bypassing the VREF pin through a capacitance. - What is the cutoff frequency of the four-pole active filter?
The cutoff frequency (Fc) is 3Khz because auscultation signals are within the 3Khz bandwidth. - Which component acts as the core of the system?
The dsPIC 30F2012 serves as the core of the electronic stethoscope system. - Does the MCP6022 perform anti-aliasing filtering?
Yes, the MCP6022 is used as a quick filter to bound the signal bandwidth and engage the anti-aliasing filter purpose. - What type of filter anatomy does the MCP6022 use?
This is a Chebychev filter that uses Sallen-Key filtrate anatomy with identity gain for change roll-off. - Can the gain of the MCP6S26 be adjusted via software?
Yes, the PGA is configured for software manageable advance for AC signaling. - How many blocks are fundamentally in this system?
There are fundamentally eight blocks in this system. - What is the function of the capacitor C32 in the circuit?
The capacitor acts as a brief for AC sign effectively attaching the VREF pin, while acting as an afford circuit during unfluctuating tell DC signaling.
