delabs Circuits

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.

delabs

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

delabs

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 - DiscoverCircuits.com - 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 - Wikipedia.org - 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.

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

Friday, July 21, 2017

Continuity Tester

Question - i want a continuity tester circuit or get one.

mail by RB

Here are some pages that might help

Simple Component and Continuity Tester - This simple project may be used for testing components, as well as checking circuit board tracks, wires and connections for continuity (conduction). It tries to pass a small current through the item being tested and the LED will light brightly, dimly or not at all according to the resistance of the item.

POPTRONICS Continuity Tester - This is another invaluable piece of test equipment for digital work. It has been designed by us to cater for a particular application . . . servicing digital projects sent in for repair. 

Continuity Tester, Smart - A tester by Tony Van Roon. This uses a 741 opamp and works off a dual supply and hence rather complex but more accurate. This may need some design changes too.

Silicon Chip Online - A Programmable Continuity Tester - Let's face it, almost every analog and digital multimeter does have built-in capabilities for testing continuity. However, this function is somewhat limited.

It would be a good idea to buy one like this

Continuity Tester CT6101

Heavy-Duty Continuity Tester CT6101- The Continuity Tester is very easy to use and is used to test for breaks in non-energized wires or cords. Continuity has a bright 360 degree visual indicator located near the tip along with a flexible lead for ease of use.

Thursday, July 20, 2017

Simple Battery Characterizer

I was reading about some IC's from Maxim/ Dallas saying " Simple battery characterizer" for plotting a charging/ discharging cycles & graphs are available on computer for study I want to plot an extensive data of these batteries.

From MO

This circuit is a battery characterizer that applies a fixed load to a charged NiCad or NiMH cell and measures milliamp-hour capacity as it discharges.

PIC-based circuit example from Westford MicroSystems - Battery Characterizer that determines milliamp

Simple Characterization Circuit

Simple Characterization Circuit for Rechargeable AA Cells - Maxim.

Abstract: This characterization circuit, plus a PC and some software, accurately measures the full discharge cycle for a rechargeable AA cell. Cell capacity and output resistance can easily be determined from the curve resulting from these measurements. 

delabs

Friday, July 14, 2017

Desoldering Methods

Dear Solderman, i hope you know how to dessolder a wave soldered component from a board. There is problem because the pins are two face soldered. - thanks

mail from JS

Sending a few sites, read them all and then tell me.

Desoldering - Wiki

A component with one or two connections to the PCB can usually be removed by heating one joint, pulling out an end of the component while the solder is molten (bending the other lead to do so), and repeating for the second joint. Solder filling the hole can be removed with a pump or with a pointed object made of a material which solder does not wet, such as stainless steel or wood.

Desoldering Methods

How to Desolder

One of the most frustrating parts of building electronic circuits is getting something wrong. For a board that should take ten minutes to put together, you could spend an hour just trying to fix a component that you got backwards. Sadly, desoldering it’s not as easy as soldering in reverse.

Desoldering requires two main things: a soldering iron and a device to remove solder. Soldering irons are the heat source used to melt solder. Irons of the 15W to 30W range are good for most electronics/printed circuit board work.

Desoldering THM and SMT

Desoldering is a topic that no one seems to get to excited about until the time comes when people discover that a lot of damage is being done during this operation.

delabs

Wednesday, June 14, 2017

Active Camera trigger shutter

well listen i read about an idea but i didn't get it so well and i want to develop it if i understood it with ur help active camera trigger shutter something like that i want to know input output solutions and i was wondering if i can send the picture to a mail and how

mail from MK


Is this what you are looking for....

The HSP DIY system must therefore be a control system. Suitable control systems range from amazingly simple to extraordinarily complex. The tips on the following sections are designed to help you select the type of control system you wish to build and us

Active Camera trigger shutter

Photoflash circuit from pocket camera - This schematic was traced from an electronic flash unit removed from an inexpensive pocket camera, a Keystone model XR308.  Errors in transcription  are possible.

Flash slaves are used when you need to supplement one flash unit with one or several more. This slave trigger simply triggers those other units.

Slave Flash Trigger - A Programmable Optical Slave Flash Trigger  for Digital Cameras with Processor PIC 12F675

delabs