Electronic Circuit Diagrams

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Electronic Circuits and Product Designs

Low Cost AM FM Stereo Receiver

FM stereo demodulation is accomplished by the use of the LM1800 phase locked loop, thereby eliminating the need for external coils. The AM function of the receiver is done completely with the LM3820 AM radio system. While designed for 3 section tuned superheterodyne application.The LM382 dual preamplifier was selected for its minimum parts count and low noise capability.

on: 5/16/2022

DMM with ICL7103A and ICL8052A

The purpose of this application note is to describe the operation and potential pitfalls of a 10V resolution (VREF = 100mV) 4 1/2 digit autoranging scheme using the ICL7103A/ICL8052A pair. Two auto-ranging circuits are included within the text. Each is discussed in terms of its advantages and disadvantages.

on: 11/2/2021

Battery Operated Auto Ranging DVM

This application note describes a technique for auto-ranging a battery operated DVM suitable for panel meter applications. Also, circuit ideas will be presented for conductance and resistance measurement, 9V battery and 5V supply operations, and current measurement.

on: 11/1/2021

ATmega328 Single Board Computer SBC

The Atmel 8-bit AVR RISC-based microcontroller combines 32 KB ISP flash memory with read-while-write capabilities, 1 KB EEPROM, 2 KB SRAM, 23 general-purpose I/O lines, 32 general-purpose working registers, 3 flexible timer/counters with compare modes, internal and external interrupts, serial programmable USART, a byte-oriented 2-wire serial interface, SPI serial port, 6-channel 10-bit A/D converter...

on: 10/23/2021

Universal Signal Conditioning

Here is a practical application of the dual differential amp. This circuit is for DC or slow moving DC like Strain Gauge and transducer signals. The RC and Zeners are for protection and clamping. Why and how has been described in other posts here. The high impedance op-amp input cannot face the real world unprotected. OP07 is always the selection due to the low offset. When the sensor generates data in mV, you cannot afford any error introduced in this front end, right.

on: 7/26/2019

LM331 A to D Mux Input Switch

This is the full circuit of a V/F convertor interface for 80C31 SBC. The Mux is configured for selecting between two inputs. It uses analog switch 4066. LF353 along with LM331 form the VCO, you can further study such configuration in the Application Notes of TI/NS.

on: 7/24/2019

Two Stage Sequential Timer

This is an example of a cascaded or sequential timer, here two CD4541 are forming a two stage timer. You can add more in a chain, but better to use a microprocessor or Microcontroller for such a purpose. But make sure EMI-RFI immunity is high for these circuits or wrong resets and sets can make a machine like an Oven or Environment Chamber malfunction and even ruin the job.

on: 7/24/2019

Analog Blind Dial On Delay Timer

It is called analog dial timer as it has no digital display, but the chip is digital it is CD4541. It is Mains operated, you could make on-delay or off-delay. By changing the caps and resistors or with even dip-switches you could get timing of few seconds to many hours.

on: 7/12/2019


delabs Technologies News

IrfanView for Images and Pictures

IrfanView is an image viewer, editor, organiser and converter program for Windows. It can also play video and audio files. IrfanView is named after its creator, Irfan Škiljan, from Jajce, Bosnia and Herzegovina, living in Vienna.

on: 11/2/2022

Vivaldi Browser with Mail and Calender

Most impressive is the Free pop3 email like simon@vivaldi.net and free wordpress powered blog like simon.vivaldi.net. Built-in ad blocker, pop up blocker and tracker blocker. It comes with built-in e-mail client with IMAP and POP3 support. The browser can be used as a feed reader to save RSS and Atom feeds. (vivaldi’s spirit in the center of the screenshot was added by me.)

on: 9/9/2022

Toucan synchronise and backup your data

Five synchronisation modes, Copy, Mirror, Equalise, Move and Clean. These can be combined with a variety of file checks such as File Size, Modified Time and a File Header Check to minimise the amount of copying needed.

on: 8/10/2022

The Classics Illustrated Collection

Classics Illustrated is an American comic book/magazine series featuring adaptations of literary classics such as Les Miserables, Moby Dick, Hamlet, and The Iliad. The series began publication in 1941 and finished its first run in 1971, producing 169 issues.

on: 7/20/2022

Stephen Ostermiller Code

Stephen Ostermiller has many interesting and innovative code that will help you learn the right way to write code in JavaScript or Perl . Some of the highlights are Scientific Calculator, Triangle Calculator, Contact Form, Tic-Tac-Toe Graphing Calculator Programs, Java Utilities, RSS Reader and Random Password Creator.

on: 5/21/2022

WordWeb dictionary and thesaurus

WordWeb is an international English dictionary and thesaurus program for Microsoft Windows, partly based on the WordNet database. Hundreds of thousands of definitions and synonyms. The latest international English words. Works offline, or reference to Wikipedia and web references.

on: 12/23/2021

The Oath of Aristotle

Cheer up the New Year by creating colorful, safe, ergonomic, affordable and innovative product designs. May the Force be with all of you. The Hippocratic Oath has been thrown aside by the Health Care Community. Engineers should follow Aristotle both in creativity and also ethics.

on: 12/18/2021

calibre e-book manager

calibre is a powerful and easy to use e-book manager. Free and open source and great for both casual users and computer experts. Save time on managing your e-book collection Use it everywhere and with anything, Comprehensive e-book viewer. pdf, txt, cbz, chm, docx, epub, html, rtf... It can also talk to many e-book reader devices.

on: 12/16/2021

Wikipedia free online encyclopedia

Wikipedia is an online free content encyclopedia project helping create a world in which everyone can freely share in the sum of all knowledge. It is supported by the Wikimedia Foundation and based on a model of freely editable content.

on: 12/7/2021

FileRun - File Sharing

Online File Sharing, Installs on any type of web server, Access your files from anywhere desktop, tablet or browser. Point FileRun to where you keep the files on your server and you will get instant web access to them. Sync files from your desktop using the Nextcloud desktop sync apps. 

on: 12/3/2021

Project Gutenberg Library

Project Gutenberg was the first provider of free electronic books, or eBooks. Michael Hart, founder of Project Gutenberg, invented eBooks in 1971 and his memory continues to inspire the creation of eBooks and related content today.Choose among free epub and Kindle eBooks, download them or read them online. You will find the world’s great literature here.

on: 11/29/2021

DokuWiki - Light Fast Portable

DokuWiki requires only a webserver and PHP; no database is needed. DokuWiki has an integrated indexed search with which a user can search for keywords and phrases on the wiki. DokuWiki was created by Andreas Gohr. Easy maintenance, backup and integration. Built in access controls and authentication. Many useful plugins.

on: 11/25/2021

SeedDMS Organize Documents

SeedDMS is a free document management system with an easy to use web based user interface. It is based on PHP and MySQL or sqlite3 and runs on Linux, MacOS and Windows. Powerful platform for sharing and storing documents. SeedDMS offers lots of features, while being simple to install and intuitive to use.

on: 11/23/2021

PluXml - Blog and CMS on XML

With just an Apache web server and PHP you can create a very fast website. It has a blog for articles and pages too. FlatFile xml database, there is a plugin for visual editing of articles. Mail notification for comments and an innovative captcha which is pleasant to use. Plugins for friendly URLs and other useful features. Thank You  - delabs 2020 

on: 11/20/2021

RainLoop - Simple and Modern Web-based Email

Administrative panel for configuring main options.  Managing folders list.  Simple look'n'feel customization.  Configurable multi-level caching system.  Extending functionality with plugins installed through admin panel.  Perfect rendering of complex HTML mails.  Drag'n'drop for mails and attachments.  Keyboard shortcuts support.  Autocompletion of e-mail addresses. 

on: 11/19/2021

XAMPP free and open-source web server

XAMPP is a completely free, easy to install Apache distribution containing MariaDB, PHP, and Perl. The XAMPP open source package has been set up to be incredibly easy to install and to use. WAMP or LAMP stack with OpenSS, FileZilla, phpMyAdmin, Mercury Mail, TomCat Java.

on: 11/12/2021