delabs Circuits

Saturday, October 28, 2017

ECG EEG EMG bio-amplifier

i need to build a bio-amplifier capable of amplifying ecg, eeg & emg signals and displaying the corresponding waveforms on a computer monitor. the bio-amp has to be accompanied by a software program built using QBasic/QuickBasic. the bio-amp must use an rs232 serial interface port.

mail from AM


Study all these resources, that will help you with your project and learn the science.

Electrocardiogram (ECG) circuit

This application note makes use of a DrDAQ Oscilloscope / Data Logger to read and store electrocardiograms but this can be subsituted by any of the PicoScope range of oscilloscopes.

Electrocardiogram

A Portable, Low-Power, Wireless Two-Lead EKG System - PDF

Sensor devices (“motes”) which integrate an embedded microprocessor, low-power radio and a limited amount of storage have the potential to significantly enhance the provision of emergency medical care.

Zigbee- based Low- cost, Low- Power Wireless EKG

Electrocardiogram (EKG) monitoring is of prime importance in the medical world. Using the state of art technology to take it to a wireless platform can open up a broad spectrum of wireless medical devices.

ECG Monitor - Abstract - PDF
This project deals with an application of H3687 from Renesas H8 series of processors in the Medical field to record ECG.

PC based ECG Monitoring System
A project on creating and research the framework needed for building a PC based ECG monitoring system.

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Friday, October 27, 2017

Scart to RGBS Circuit

Question - scart to rgbs circuit - SCART Connectors were used for Video and TV -  mail from KU


Have a look at these examples

SCART RGB interfacing

SCART connectors used with many European video equipments is designed to carry composite video and RGB video signals.

SCART Connectors for Video and TV

SCART - Wikipedia

In Europe, SCART used to be the most common method of connecting AV equipment, and was a standard connector for such devices; it was far less common elsewhere. As it was designed to carry analog standard-definition content, SCART has become obsolete

A Single SCART Interface for Video - Maxim/Dallas

In many SCART applications, specialized ICs are used for the SCART interface because of the complicated switching required. This is not cost effective for single SCART implementation.

Now that HDMI and HD Videos have come, these issues may not bother much.

Friday, October 20, 2017

Visual Inspection for Quality Control

Wanted a system for detecting: "missprinting cartons reject" in production - Message: pls give me help about mention subject.

Mail from SS


You can scan the manufactured objects with a camera connected to computer USB. Then compare the scans got with a reference standard. Apply a tolerance for acceptance or rejection. Based on the quantity of rejections improve process, till faults are within acceptable limits.

The scanned object must be in same position and same angle for proper results. This depend on some guiding system in conveyor to make object position properly.

Machine vision (MV) is the technology and methods used to provide imaging-based automatic inspection and analysis for such applications as automatic inspection, process control, and robot guidance, usually in industry.

Machine vision is a term encompassing a large number of technologies, software and hardware products, integrated systems, actions, methods and expertise.

Machine-Vision in Genomics Research

A novel machine-vision-based facility for the a.utomatic evaluation of yield-related traits in rice.

Machine-Vision in Genomics Research

The evaluation of yield-related traits is an essential step in rice breeding, genetic research and functional genomics research. A new, automatic, and labor-free facility to automatically thresh rice panicles, evaluate rice yield traits, and subsequently pack filled spikelets is presented in this paper.

Details of the inspection unit. The inspection unit consisted mainly of a three-stage conveyor, two line-scan cameras, two LED light sources, a wind separator and an unfilled spikelet outlet.

Inside the Box Winn Hard

Machine-vision system validates barcodes on packages within carton. The cameras take images of the open shipping container, locate individual packages inside, and then locate the product labels on the individual packages. The information along with images for archive and audit is returned via Ethernet to the Numina Group’s Carton Audit and Validation System (CAVS).

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Thursday, September 28, 2017

Mains Stability and Supply Regulation

I have problem with my power supply... . The power supply uses LM317 and TIP2955 and the unstable AC net here causes the output to drop sometimes below 5V. The normally output is 13,5V. I like to look at your schematics to improve my power supply.

Mail from WV

See some circuits here ...

See the Insides of a DIY Ham Radio Power Supply

DIY Ham Radio Power Supply

You have to ensure at least a min of 15V AC to the Bridge or diodes on transformer. Only if a DC of around min 17V is available at input DC of 13.5 can be managed by this circuit. This circuit will not boost a voltage from a lower value for that you need Switching Boost Supplies.

Use AC Voltage Stabilizers or ServoStabilizers to maintain a stable AC Supply.

WorkBench Dual Power Supply
LM317 - Simple Workbench Dual Power Supply

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.....I like to compare with my schematics from our power supply. We have something very strange.. the backup battery takes over and don't cause a voltage drop when I disconnect power supply from 220V AC lines.. but the backup battery can not anticipate the disturbances in the 220V AC lines and gives a very short power drop at the output..

We have sometimes very short power drops at the output of the power supply.. Do you have any idea what is wrong? The transformer is 16V AC 3A
Reply from WV

You can double the size of filter caps at input. use something like 10,000uF, if you draw 3A a 10000uf across the input rectifier may help. Or you have to use a battery of 12V after the LM317. So that the battery can supply the short outages.
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But that is exactly my problem, we have a large battery after the power supply of 13,5V 5,5Ah, but it doesn't help to avoid the powerdips after the power supply..
Reply from WV

I feel you have a ground loop problem, The wires to the battery seem thin. I feel the potential across a ground wire must be lifting up when mains fluctuates.

The PCB ground plane may be thin or absent, check all ground and supply wires. Make all supply wires and Tracks thick and radiate from a center copper lug reference. Both positive, negative and ground tracks reinforce with lead or copper braids. Use decoupling caps at every stage.

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