| Circuits Designed by Dave Johnson, P.E. : |
|
Unplugged Power Cord Alarm - Many medical devices, such a portable X-ray and ultrasound equipment, carry their own batteries. However, the frantic pace of some hospital emergency rooms might cause the device to be shoved off into a corner without being plugged back into an AC power source to recharge their batteries. So, I designed this circuit to emit an audible alarm whenever the device’s power cord was unplugged from the wall for a period of time. . . Circuit by David Johnson P.E.-July, 2000 |
|
|
|
Tablet Reminder that Uses Watch Module - This device is used as a reminder to take medicine every day. This device actually contains a crystal watch and a 4001 quad 2-input NOR gate with two of the gates (IC1a & IC1b) wired as an RS flipflop. The watch is set to "tablet time", usually mornings, when an alarm is activated with a high signal fed via diode D1 which sets the RS flipflop and enables the oscillator comprising gates IC1c & IC1d. __ Designed by Rasim Kucalovic Tan Timer - Six timing positions suited to different skin types Timing affected by sunlight intensity Circuit diagram: Parts: R1 47K 1/4W Resistor R2 1M 1/4W Resistor R3, R5 120K 1/4W Resistors R4 Photo resistor (any type) C1, C3 10µF 25V Electrolytic __ Contact: IQ Technologies
TENS for muscle stimulation - Medical and health related electronic circuit diagrams / circuit schematics. These circuit are to be used at your own risk And I "DO NOT" imply any medical benefit can be obtained from their use. __ Designed by G.L. Chemelec |
|
The ESP SIM (Sound Impairment Monitor) - The smallest variation in amplifier performance is shown with this simple circuit __ Designed by Rod Elliott ESP The HeartMate Heart Monitor - Build it and keep tabs on your ticker. It's just a shot for monitoring your heart rate during exercise, so you dont overdo it.__ SiliconChip
The SID Seizer-monitor SIDs - The SID Seizer is a VLF/LF receiver project for monitoring Sudden Ionospheric Disturbances, typically caused by solar flares. This article assume the reader has basic knowledge of the effects of solar flares on the ionosphere. (A web search will yield a wealth of information on SID reception, including other simple designs, typically employing loop antennas.) Breaking with tradition, the SID Seizer uses a vertical whip antenna with a tuned amplifier, instead of a tuned loop. My house and neighborhood have so much magnetic noise that a vertical whip antenna is significantly superior to a loop. __ Contact: Charles Wenzel of Wenzel Associates, Inc. |
|
|
|
|
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. Design by J Terrade Tiny EEG interface schematic - Schematic Only
Transcutaneous Electrical Nerve Stimulator (TENS) - A Transcutaneous Electrical Nerve Stimulation (TENS) device is, put bluntly, a machine for giving electric shocks. The author was prescribed such a device on loan by his orthopaedic specialist. The unit has a large number of programmes, of which he used only one. Measuring the signals at the output of the device in this mode revealed damped oscillations at a frequency of approximately 2.5 kHz, with a repetition rate of approximately 100 Hz __ Designed by Klaus Rohwer© Elektor Electronics Magazine
Unplugged Power Cord Alarm - Many medical devices, such a portable X-ray and ultrasound equipment, carry their own batteries. However, the frantic pace of some hospital emergency rooms might cause the device to be shoved off into a corner without being plugged back into an AC power source to recharge their batteries. So, I designed this circuit to emit an audible alarm whenever the device’s power cord was unplugged from the wall for a period of time. . . Circuit by David Johnson P.E.-July, 2000
Vital-signs Monitor consumes less than 50µA - 02/02/98 EDN-Design Ideas A remote data-acquisition circuit for monitoring a patient's vital signs--pulse rate, respiration, and temperature--uses very little power as well as inexpensive sensors and circuits (Figure 1) . The. Design by Leonard Schupak, Discovision Associates, Irvine, CA
Wart Zapper - The Wart Zapper uses a single CMOS
7555 oscillator (IC1) , for dual purposes, as follows: First, it pumps up a standard voltage tripler circuit, represented by the capacitor-diode network to the right of IC1 in the circuit diagram. This takes the voltage up to about 25V, if not a little more. The purpose of increasing __ Designed by Rev. Thomas Scarborough
Yoga Breathalyzer - 13-Jun-14 -Design News: The yoga breathalyzer is a breath visualization tool to help you understand and get in touch with your breathing. __ Gadget Freak-Case #256
Zapper for Electrotherapy - NOTE
: Must register on this site __ Designed by Published in Elecktor July/Aug, 2010 |
