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

 

Last Updated: October 09, 2017 03:39 PM

Circuits Designed by Dave Johnson, P.E. :
Power Loss BeeperFor some medical equipment it is important for an operator when power is lost to the machine.  The beeper is powered from a 9v battery and requires the machine to have a power switch with a third set of contacts. . . Circuit by Dave Johnson P.E.-March, 1999

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

PC thermometer using PC game Joystick Port -  A method of measuring temperature using the PC Game port.   Display is via the program dialog or in the System tray.  V2.2.5 supports timed FTP to a web server __ Designed by andrew  AT AndysWorld

PC-Based heart rate Monitor using Arduino & Easy Pulse sensor -  The heart rate, also referred to as pulse rate, has been recognized as a vital sign since the beginning of medicine, and it is directly related to a person’s cadiovascular health.  Today, we are going to make a PC-based heart rate monitor system using an Arduino board and Easy Pulse V1.1 sensor.

Pedometer -  Pedometer has a range of 9.950 meters with2-digits.  Slip it in pants pocket for walking and jogging __ Contact: Flavio Dellepiane, fladello @ tin.it

Periodically on-off Mosquito repellent -  Here is a circuit that automatically switches on and off the mosquito repellent after preset time interval, thus controlling the release of toxic vapours into the room.  __ Electronics Projects for You

Personal Noise Source for Tinnitus Sufferers -  Portable device generates soothing pink or white noise to mask out unwanted sounds.__ SiliconChip

Pills Reminder -  468122448 hours setting; LED or Beep Alert9V Battery Supply __ Contact: Flavio Dellepiane, fladello @ tin.it

Pills reminder Alarm using CMOS logic gates -  A Pills Reminder is a device that operates a flashing LED  (and/or a beeper) at a fixed hour interval.  A choice of time-intervals as wide as possible is available with this circuit, namely 4, 6, 8, 12, 24 and 48 hours.  At first you must choose the hour interval by switching SW1 to the desired value, then apply power by means of SW2.  After the hour delay chosen has elapsed the LED will start flashing at 2Hz, i.e.  two times per second__ Learning Electronics

Pocket TENS Unit for Pain Relief -  Little Jim AM Transmitter__ SiliconChip

Positive Feedback for Isometric Muscle Experiments -  Here I present my 2'nd year university physics project, undertaken while at Imperial College, London university. Unlike the 1'st and 3'rd year projects, which were my own proposals, this one was selected in the more usual way from a list of undergraduate projects provided by the physics department. __ Designed by Hans Summers

Power Loss Beeper -  For some medical equipment it is important for an operator when power is lost to the machine.  The beeper is powered from a 9v battery and requires the machine to have a power switch with a third set of contacts. . . Circuit by Dave Johnson P.E.-March, 1999

Powering an ECG Front End in Battery Powered Patient Monitoring Applications  -  Figure 3 shows a typical screen capture using the evaluation board software with a patient simulator attached to the evaluation board.  , CIRCUIT EVALUATION AND TEST, Noise Measurements The evaluation board software was used to capture the peak-topeak noise performance of the ECG lead path using the ADAS1000 evaluation board__ Analog Devices from the Lab

Pulse Oximeter via Finger Clip Reference Design with BLE Connectivity -  This reference design is for a complete SPO2 Pulse Oximeter finger clip end equipment featuring TI signal chain, power, and connectivity components. With TI’s AFE4490 Pulse Ox AFE, you can accelerate and simplify your pulse ox design while still ensuring the highest of quality clinical measurements. This reference design also includes a full BLE connectivity design for easy interface to BLE enabled smartphones, tablets, etc.__ Texas Instruments

Pulse Rate Monitor -  This simple circuit enables you to listen to your heartbeat, for instance, while you are exercising.  The transducer used for detecting the pulse is an electret microphone, X1 in the diagram.  The model used has two  (polarized) terminals.  As usual with this type of microphone, it functions via a series resistor, R1.  The potential drop

Pulse rate Monitor using TLC274 opamp -  This simple circuit enables you to listen to your heartbeat, for instance, while you are exercising.  The transducer used for detecting the pulse is an electret microphone, X1 in the diagram.  The model used has two  (polarized) terminals.  As usual with this type of microphone, it functions via a series resistor, R1.  The potential drop across this resistor__ Learning Electronics

Rain sound effect Generator -  Agreeable, relaxing effect, helping to fall asleep; Small portable unit, 3V battery powered __ Contact: Flavio Dellepiane, fladello @ tin.it

Ridiculously Sensitive Electric Charge Detector -  This simple circuit can detect the invisible fields of voltage which surround all electrified objects.  It acts as an electronic "electroscope.  "  __ Designed by William J. Beaty

Salt-Taster -  Detects the amount of salt contained in liquid foods; Three-level LED indicator __ Contact: Flavio Dellepiane, fladello @ tin.it

Simple Circuit 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

Simple Circuit 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  © Hack Canada

Simple Circuit pulse oximetry for wearable Monitor -  EDN-Design Ideas 09/14/2014     Use this circuit as the “heart” of a pulse oximeter and oxygen saturation monitor. __ Circuit Design by Martin Jagelka , Martin Daricek & Martin Donoval

Skin Rensponse Meter -  Human skin offers some resistance to current and voltage.  This resistance changes with the emotional state of the body.  The circuit proposed here measures changes in your skin resistance following changes...__ Electronics Projects for You

Sleeping aid -  Many people experienced sleeping well in natural surroundings, into a tent or a wooden hut.  This fact is due not only to the healthy atmosphere but also from our unconscious ability to perceive natural Earth's magnetic-fields.  The circuit generates this type of Geo-magnetic-fields and lets us perceive them: in this manner our brain is surrounded by an ideal environment for a sound sleep.   (N.B.  Basic ideas for this circuit are coming from German papers) .__ Learning Electronics

Sleeping Aid -  Based on electromagnetic-field radiation; Place it under the pillowBuilt-in timer __ Contact: Flavio Dellepiane, fladello @ tin.it

Sleeping-Aid -  Based on electromagnetic-field radiation.  Place it under the pillowBuilt-in timer.  Circuit diagram: Parts: R1, R5 1K 1/4W Resistors R2 10K 1/4W Resistor R3, R6 10M 1/4W Resistors R4, R7 2M2 1/4W Resistors R8, R9 4K7 1/4W Resistors C1, C7 47µF __ Designed by Flavio Dellepiane

Smart Hearing Aid -  Normally, hearing aid circuits consume battery power continuously once they are switched on.  The circuit given here saves battery power by switching on the sound amplifier section only when sound is...__ Electronics Projects for You

Snore Alarm -  The idea behind this snore alarm, is just to rouse the snorer, not the entire household.  To wake the sleeper, vibration is used, not an audible alert.  The vibration is provided by a small motor housed in a small 35mm film case, which can be placed under the sleepers mattress or pillow.  This circuit has a level control and peak display indicator, a variable trigger __ Designed by Andy Collison

Snore Alarm Electronic Device -  Here I describe a little electronic device that detects snoring.  The principle though very simple is efficient and well protected against false triggerings.  Upon detection, it generates a noisy and painfull alarm.  Just what's necessary to wake up everybody except the snorer.   __ Designed by chabin laurent

Step Km Counter Max -  Pedometer has a range of 9.950 meters with2-digits.  Slip it in pants pocket for walking and jogging __ Contact: Flavio Dellepiane, fladello @ tin.it

Stress Meter -  This project comes with all parts, PC board and a pre-programmed chip for STRESS METER.  But you are encouraged to add more sub-routines to the program and learn to program the chip yourself.  You will need the "Chip Programmer Model F" and the software provided below
 __ Contact: Collin Mitchell

Stress Meter Circuit Diagram with Full Explanation -  ContentsWhat is a Stress Meter? Stress Meter: Circuit Explanation Assembly and usageStress meter lets us access our emotional pain in an electronic format.  With the help of this device one...__ Electronics Projects for You

Sudden ionospheric disturbance (SID) receiver -  The AAVSO SID Program consists of solar observers who monitor very low frequency  (VLF) radio stations for sudden enhancements of their signals.  Earth's ionosphere reacts to the intense X-ray and ultraviolet radiation released during a solar flare.  The ionospheric disturbance enhances VLF radio propagation.  By monitoring the signal strength of a distant VLF transmitter, sudden ionospheric disturbances  (SIDs) are recorded and indicate a recent solar flare event. __ Contact: AAVSO SID Program

Sun tanning timer -  This timer was designed for people wanting to get tanned but at the same time wishing to avoid an excessive exposure to sunlight.  A Rotary Switch sets the timer according to six classified Photo-types  (see table) .  A Photo resistor extends the preset time value according to sunlight brightness  (see table) . __ Contact: Flavio Dellepiane, fladello @ tin.it


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

 


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