delabs Circuits

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).


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


.....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.

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.


Wednesday, September 27, 2017

BioMedical Circuits and Electronics

Circuit: biomedical circuits email: AA
Message: I'm a student in technical studies college, and i need to study medical circuits for my Graduation.

letter from - AA

Look here ...

Biomedical Circuits Technical Committee - The goal of the Biomedical Circuits and Systems (BIOCAS) Technical Committee is to foster research, development, education and industrial dissemination of knowledge relating to the emerging field of microelectronics and nanotechnology in biological and medical applications.

BioMedical  Electronics

BioMedical  Electronics

Bioelectric recordings - The instrumentation amplifier circuit normally used in bioelectric recordings is improved for measurements under difficult circumstances. Another application is a low-cost 64 channel amplifier for multichannel ECG recordings. The third application is a device that can be added to bioelectric measurement systems and will provide a major reduction in interference.

Neurostimulation of the spinal cord - The wireless system includes a wearable recording module, a wearable stimulation module and a transceiver connected to a computer for real-time and off-line data processing, display and storage.


Friday, September 22, 2017

8254 Programmable Interval Timer Counter

I am doing final year, i am doing project on 8254 controller. please can u give me information about it. -thanks in advance.

from SA 

8254 Timer and Counter Board - This is a photo of a general purpose timer/counter card you can wirewrap in a weekend. It plugs into your PC's ISA bus just like a sound or modem card. It gives high-resolution timing (microseconds). Because of its programmablity, it is very powerful and flexible.

8254 Programmable Interval Timer Counter

C8254 Programmable Timer/Counter Core - The C8254 core implements a high performance programmable interval timer/counter device, which is designed to solve the common timing control problems in microcomputer system design

Using the 8254 Timer-Counter - Understanding the role of the system’s 8254 programmable Interval-Timer/Counter.

8254 Timer Datasheet - pdf  - The Intel 8254 is a counter/timer device designed to solve the common timing control problems in microcomputer system design. It provides three independent 16-bit counters, each capable of handling clock inputs up to 10 MHz.


Tuesday, August 29, 2017

DC Motor Speed Control

The following was submitted on February 1st, 2006 at 08:49AM (PST).- Subject: delabs Schematic Source Request. Circuit: speed motor control dc

mail from MD

Study Resources Below

Speed Controllers - The purpose of a motor speed controller is to take a signal representing the demanded speed, and to drive a motor at that speed.

FC's Pulse Width Modulator Circuits - Power your PWM circuits with solar power by using a CirKits solar kit.

DC Motor Speed: Simulink Modeling - A common actuator in control systems is the DC motor. It directly provides rotary motion and, coupled with wheels or drums and cables, can provide translational motion.

DC Motor Speed Control

Arduino/Motor Control - DC Motor Tutorials, Servo Motor Tutorials, Stepper Motors.


Monday, August 28, 2017

Fuzzy Logic and Control Systems

Could you tell me more about Fuzzy logic control, kindly share the web resources with me. Thanks.

mail from MA

some fuzzy logic control Resources in the web

The Fuzzy Logic Concept

The way that people think is inherently fuzzy. The way that we perceive the world is continually changing and cannot always be defined in true or false statements.

Fuzzy Logic in Industrial Automation

Fuzzy Logic in Industrial Automation

In recent years, fuzzy logic has proven well its broad potential in industrial automation applications. In this application area, engineers primarily rely on proven concepts.

Fuzzy Logic Introduction

Fuzzy logic starts with and builds on a set of user-supplied human language rules. The fuzzy systems convert these rules to their mathematical equivalents. This simplifies the job of the system designer and the computer, and results in much more accurate representations of the way systems behave in the real world.

Fuzzy Logic - Omega

Fuzzy Logic is a particular area of concentration in the study of Artificial Intelligence and is based on the value of that information which is neither definitely true nor false.

Tutorial On Fuzzy Logic Jan Jantzen

A logic based on the two truth values 7UXH and )DOVH is sometimes inadequate when describing human reasoning. Fuzzy logic uses the whole interval between 0 ()DOVH ) and 1
(7UXH ) to describe human reasoning. As a result, fuzzy logic is being applied in rule based automatic controllers, and this paper is part of a course for control engineers.

Fuzzy Logic Stanford

It focuses on logics based on a truth-functional account of partial truth and studies them in the spirit of classical mathematical logic


Saturday, August 12, 2017

Build RFID transmitter and receiver

Guide on how to build my own RFID transmitter and receiver?

Post by C1

You will find them here ...some entities misuse this technology, hence people have become less interested in this as it is invasive. Properly used this technology is an asset, example - inventory or asset tracking and management.

RFID Circuits - - Low Power RFID Transponder -  For some time railroad companies have been wrestling with the problem of tracking rail cars.

Need help in RFID circuit - Electro Tech -  need the circuit for RFID receiver and transponder and any useful information regarding RFID. I thought i would use PIC controller to find out the distance b/w the product and the reader.

Build RFID transmitter and receiver

RFID - - Radio-frequency identification (RFID) uses electromagnetic fields to automatically identify and track tags attached to objects. The tags contain electronically stored information. Passive tags collect energy from a nearby RFID reader's interrogating radio waves.

Fall 2004 RFID Honors Project - RFID can be categorized as low frequency or high frequency and as passive or active. This project looks mainly at low frequency passive RFID because it is the least expensive and the most common.

Low frequency passive RFID works by magnetic induction. A reader device generates an alternating magnetic field from a coil of wire. A tag also has a coil of wire that induces current from the magnetic field. This current provides power to the passive tag. The tag then sends back its own varying magnetic field which is read by the reader device.

This is an answer of mine to an old post - Tuesday 27 June 2006