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Medical Electronics / Biomedical Circuits
Medical / Biomedical:  #'s - G       H - O       P - S       T - Z 
Sensors / Detectors -- Main Page

 

Last Updated: December 07, 2017 02:05 PM

Circuits Designed by Dave Johnson, P.E. :

Medical_Corona_Monitor  -  The circuit is powered by +5v and has an on-board voltage regulator as a reference voltage.  The current from a reversed biased photodiode is converted into a voltage using an op amp circuit.  That output voltage is fed to a voltage comparator circuit.  Included is an adjustment in the current to voltage converter, to calibrate the installed circuit . . . Dave Johnson, Lubbock TX (Mar 30, 2010)-DC Magazine - Issue 8 Apr 2010

Medical Fluid Detector  -  A simple 40KHz 12v peak to peak square wave signal generator, using a 555 timer oscillator, was fed to the metal needle and the whole vertical indexing system, which was electrically isolated from everything else.  On the receiver end, a copper foil electrode, which was designed to fit snugly on the bottom of a plastic cup, acted as a holder for the fluid container. . . . Dave Johnson, Lubbock TX-DC Magazine - Issue 11 July 2010


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

 

Hand-to-Hand Body Composition Meter Reference Design with BLE Connectivity -  This reference design is for a complete hand-held body composition or fat loss monitor end equipment featuring TI signal chain, power, and connectivity components. With TIs AFE4300 body composition AFE, you can accelerate your body composition design to develop more quickly. This reference design also includes the full BLE connectivity design for easy interface to BLE enabled smartphones, tablets, etc.__ Texas Instruments

Hearing Aid -  This low-cost, general-purpose electronic hearing aid works off 3V DC  (2x1.5V battery) .In this circuit, transistor T1 and associated components form the audio signal preamplifier for the acoustic signals picked up by...__ Electronics Projects for You

Heart rate measurement from fingertip. Part 1. Schematic -  Introduction Heart rate measurement indicates the soundness of the human cardiovascular system.  This project demonstrates a technique to measure the heart rate by sensing the change in blood volume in a finger artery while the heart is pumping the

Heart rate measurement from fingertip. Part 2. Software -  Part 1.  Schematic Software The firmware does all the control and computation operation.  In order to save the power, the sensor module is not activated continuously.  Instead, it is turned on for 15 sec only once the start button is pressed.  The

Heart Rate Monitor based on a dual op-amp IC -  Strictly speaking, this simple circuit shouldn't work! How could anyone expect an ordinary light dependent resistor photo cell to 'see' through a fingertip in natural daylight and detect the change in blood flow as the heart pulsates? The secret is a high gain circuit, based on a dual op amp IC which can be either the low power LM358 or the JFET TL072.  __ Learning Electronics

Heart rate sensor -  Medical and health related electronic circuit diagrams / circuit schematics

Heartbeat Sensor (Tranduscer) -  To build a heart-beat transducer not as difficult as imagined.  Circuit below shows a simple heart-beat transducer.

Heartbeat transducer using infrared LED / Detector -  Medical and health related electronic circuit diagrams / circuit schematics

How to Understand Non-Invasive Breath Analyzers -  Breath Analyzers are used to descry and quantify the alcohol content in the subject's breath non-invasively.  These are invented by Robert Frank Borkenstein.  These__ Dilin Anand

Human-Machine Interface through Electromyography -  Electromyography  (EMG) is a technique of recording muscular activities by measuring the potential difference across a muscle of interest.  EMG signal acquisition is the latest trend as it paves way for...__ Electronics Projects for You

Inductive sensing with left-handed antenna for biomedical applications -  05/15/14 EDN-Design Ideas Could an inductive sensor help assay biological and other substances? A left-handed  (LH) antenna based biosensor is developed to investigate the near-field electromagnetic interaction between antenna and sample with different dielectric properties.  These dielectric properties can be determined by analyzing the electromagnetic coupling between the antenna and the test samples without labeling or chemical reaction.  It has the advantages of real-time detection, small feature size, reduced sample volume, and minor environmental disturbance.  Such an antenna sensor can be effectively used to measure both liquid and solid biological samples.   __ Circuit Design by Chii-Wann Lin

Jogging Timer -  3V Battery powered; Beeps after a fixed minutes delay __ Contact: Flavio Dellepiane, fladello @ tin.it

Laser Light Show -  A programmable laser light show that allows the user to specify the pattern displayed via three motor speeds and the length of time that this pattern is held. __ Designed by Matt Melynk and Josh Silbermann

Lie Detector -  Here's a simple lie detector that can be built in a few minutes, but can be incredibly useful when you want to know if someone is really telling you the truth.  It is not as sophisticated as the ones the professionals use, but it works.  It works by measuring skin resistance, which goes down when you lie __ Designed by Aaron Cake

Lie Detector -  The circuit diagram of the Lie Detector is shown above.   It consists of three transistors  (TR1 to TR3) , a capacitor  (C1) , two lights or LEDs  (L1 & L2) , five resistors  (R1 to R5) , and a variable resistor  (VR1) .  This circuit is based on the fact that a person's skin resistance changes when they sweat  (sweating because they're lying) .  Dry skin has a resistance of about 1 million ohms, whereas the resistance of moist skin is reduced by a factor of ten or more. __ Designed by  Hack Canada

Low Power EKG & Heart Rate Monitor using the MSP430FG439 -  This design details how to build a digital heart-rate monitor using a MSP430FG439 microcontroller  (MCU) . The heartbeat rate per minute is displayed on an LCD and generates a digital data stream via an RS232 serial port to allow EKG waveform display on a PC. The entire application runs using a CR2032 3-V lithium battery.__ Texas Instruments

Low Power Pulse Oximeter & EKG Reference Design -  This reference design details non-invasive optical plethysmography pulsoximetry using the MSP430FG437 microcontroller  (MCU) . The pulsoxi-meter consists of a peripheral probe combined with the MCU displaying the oxygen saturation and pulse rate on a LCD glass. The same sensor is used for both heart-rate detection and pulsoxi-metering in this application. A custom LabVIEW GUI has been developed for this application to display the heart signal, heart rate and % SaO2 number. All the necessary files and steps to get this GUI up and running have been provided along with this report.__ Texas Instruments

Low-Cost Hearing Aid -  Commercially available hearing aids are quite costly.  Here is an inexpensive hearing aid circuit that uses just four transistors and a few passive components.  On moving power switch S to on position,...__ Electronics Projects for You

Low-Cost Hearing Aid -  This hearing aid circuit offers the advantages of high sensitivity, low current consumption, low cost and light weight.Audio signals are sensed by the condenser microphone and amplified by two op-amps built...__ Electronics Projects for You

Medical_Corona_Monitor  -  The circuit is powered by +5v and has an on-board voltage regulator as a reference voltage.  The current from a reversed biased photodiode is converted into a voltage using an op amp circuit.  That output voltage is fed to a voltage comparator circuit.  Included is an adjustment in the current to voltage converter, to calibrate the installed circuit . . . Dave Johnson, Lubbock TX (Mar 30, 2010)-DC Magazine - Issue 8 Apr 2010

Medical Fluid Detector  -  A simple 40KHz 12v peak to peak square wave signal generator, using a 555 timer oscillator, was fed to the metal needle and the whole vertical indexing system, which was electrically isolated from everything else.  On the receiver end, a copper foil electrode, which was designed to fit snugly on the bottom of a plastic cup, acted as a holder for the fluid container. . . . Dave Johnson, Lubbock TX-DC Magazine - Issue 11 July 2010

Medical timer warns when pills are due -  05/10/01 EDN-Design Ideas Some people need to take medication at precise, regular intervals.  When you're in a hospital, a medical staff is present to ensure that you take your medication on time.  But when you're taking medication at home, you must frequently look at the clock-a clear annoyance.  When my wife was pregnant, she needed to take medication every two hours from 8 am to 10 pm.  To help her time the two-hour intervals, I built the battery-powered circuit in Figure 1.  The circuit derives its power from a 9V PP3 battery.  All the ICs are CMOS -based; the low power consumption of the circuit allows one-week autonomy.  When you press the start button, BP1, a two-hour delay commences.   __ Circuit Design by J Terrade

Medicine-Time Reminder -  We are all so busy with our daily lives that we forget to take our medicines on time, which can have several ill effects on our health.  The circuit described here...__ Electronics Projects for You

Model 2030 XRAY Monitor instruction manual including Schematics -  Medical and health related electronic circuit diagrams / circuit schematics

Muscular Bio-Stimulator -  Particularly suitable for cellulitis treatment; 3V battery supply, portable set __ Contact: Flavio Dellepiane, fladello @ tin.it

Muscular Bio-Stimulator 2nd Version -  Improved version of the popular circuit.  Increased output voltage, More complex output wave forms __ Contact: Flavio Dellepiane, fladello @ tin.it

Muscular Stimulator -  Here is a circuit that stimulates nerves of that part of your body where electrodes are attached.  It is useful to relieve headache and muscular pain and revive frozen muscles that...__ Electronics Projects for You

OpenEEG open hardware EEG project -  Medical and health related electronic circuit diagrams / circuit schematics

Optical Heart Rate Monitor -  Medical and health related electronic circuit diagrams / circuit schematics

Optical Heart Rate Monitor Reference Design with BLE Connectivity -  This reference design is for a complete Optical Heart Rate Monitor wrist watch  (no chest strap!) end equipment featuring TI signal chain, power, and connectivity components. With TIs AFE4400 AFE, you can accelerate and simplify your wrist based HRM design while still ensuring measurement performance needed for serious Fitness designs. This reference design also includes a full BLE connectivity design for easy interface to BLE enabled smartphones, tablets, etc.__ Texas Instruments


Medical / Biomedical:  #'s - G       H - O       P - S       T - Z 


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