EE Resource Sites

The EE Resource Sites has been updated. These lists are now over a decade old. Many Broken Links have been removed. Some Resources that were listed have moved to the blogs.



Electronics Engineering Reference Resources

Electronics 1 - Hobby or DIY Electronics and Electronic Engineering Design.

Electronics Hobby or DIY Electronics and Electronic Engineering Design go hand in hand. Many inventions, discoveries and improvements in this technology has been done by Non-Engineers who acquired skills and built firms that created many positions for engineers to work in....

Ham Radio Enthusiasts improved the Communication Awareness and Science of RF Circuits. Now Communication Systems are built on Embedded Systems. In every niche of electronics, Microcontrollers, SoC and DSPs have become indispensable.

Understanding the behavior of Electronic Components. Learning the usage of Mechanical Tools and Equipment to build or manufacture Electronic Products or Prototypes. Mastering the use of the Test Bench and Test Instruments like the Scope and DMM. All these constitute the total skill set in electronics. 

Power Supplies and SMPS

Here are power supply, inverter, drives, chargers and high current equipment diagrams and links. There are Mosfet and Thyristor circuits too.

Power Electronics Section

Power Supplies, Inverters, UPS, Chargers, Electro Plating, Precision Welding-erosion, Coating Metals and many other Processes are made of high current circuits. Even in measurement of parameters like Micro-Ohm high currents are involved. Electronic Circuits are required in such products to give control to time, current, frequency and voltage in order to accomplish with the required precision a process or job.

In any power equipment, efficiency and reduction of bulk is crucial so SMPS and high frequency control is an important part of this domain. These products also generate EMI-RFI. Product Safety Study is also vital.

Power Electronic Circuits.

Basic Power Supply Designs - AC and DC voltage Regulators, Battery Backup Power Supplies. Battery Chargers, UPS and Inverters. Dual regulated Power Supplies. 5V and 12V Regulators. Benchtop Power Supplies.



Power Supplies Section.

Switching Supplies and SMPS - Circuits of SMPS, Power Supply, Switch Mode Power Supply are here. High Voltage Power Supply concept. DC Regulated 3 Pin Power Supplies like 7812 and 7805. Workbench Supplies.

• Regulated High Voltage Power Supply
• Switching Battery Charger with L296
• 100kHz Half Bridge Convertor SG3525
• Simple WorkBench Dual Power Supply

Solid State Relays - SSR.

Here are many Types of SSR or Solid State Relays. In this section you will find SSR designs and PCB layouts which you can study. These were made and sold by me years ago. So the PCB layouts have gone thru some revisions and they worked quite well.

High Energy Circuits

High Energy Power Circuits, Thyristor controls like AC and DC Drives, HV power Design, UPS and Mains Power Inverter. SCR control and Battery Chargers.

Happy New Twenty Fifteen

delabs circuits has been made Responsive. Tablet Computers, Laptops, Netbooks, Notebooks and Desktops will render most of delabs and dapj blogs/sites correctly. Other Devices like Smartphone and SmartTV are partially supported.

All blogs and sites of delabs are now SSL it looks like https://. That means more Security and Privacy. We have also removed most of third party scripts and social media links for the same reason.

These will be no New Year Card for 2021. Please Reuse the one below.  Wish all of you a Safe and Sensible 2021. Give importance to Nature, Environment, The Flora and Fauna. 

Protect and Preserve, Renovate, Revive and Resurrect Hills, Mountains, Lakes, Ponds, Rivers and Streams. If these deteriorate then the end of Mankind is certain.

Happy New Twenty Fifteen

 

Welcome an Era of new ways of Embedded Systems in Device Communication and Interface.

PLC based PID Controller

Below is a Electrical Control Panel, It has a Strip Chart Recorder which is electro-mechanical, It has a PLC Inside. A handheld PLC Programming unit. The computer is showing the Ladder Logic Program. PLC is based on a embedded uC. The DIN Controllers are Analog + Digital circuits.

Process Control Application Notes

So you see it is a Electrical Control Panel with Electronics and the PLC Ladder Logic means, Software too.



Electrical Control Panel Wiring

This is a PID Controller based Control Panel using a PLC. The Computer is a 386 40MHz with 40MB HDD. The printer Epson dot matrix, The worktable is an inhouse design made of steel and plywood, capable of withstanding heavy loads.

You can also see a Stripchart recorder for the temperature logging and PID curve study. This controls a Steam Valve with 4-20mA output.   

Design Service and Custom Projects

Some old examples of open custom designs. these were made to educate the customer and also study the capability  of online communication and and collaboration tools for such activity.

Two Stage Sequential Timer Docs - 

The circuit is a two stage sequential timer with auto reset. It can turn a Solenoid On/Off after a Sequence of delays that are preset. This is also a basic example of timer usage in automation.

Design Documents

• Discussion of Sequential Timer - A
• Discussion of Sequential Timer - B
• Sequential Timer Specs.
• Two Stage Sequential Timer.
• Li-Ion Battery Charger.

All Timers are 1 - 30 Secs Analog with Presets to adjust with a screwdriver. The Switch, Solenoids and Power supply has to be via terminal blocks or plug-jacks. The PCB may be upto six Square Inches for standard DIP components but with SMD it may be smaller.



Four Channel Temperature Alarm Docs

The temperature in a pipe is monitored with four RTD Pt-100 Sensors, The type of probe could be Extruder RTD probes with Bayonet or Compression Fitting, Get it from Omega. To keep costs low you can choose small thin film RTD sensors, they will be fast but on rough usage may break.

Design Documents

• Discussion of four Channel Alarm.
• Four Channel Temperature Alarm.
• RTD Pt-100 Four Point Alarm.
• Timer and Counter Modules.

The time taken to measure the temperature at the 4 points will be less than 4 seconds. An optional display of the measured temperature as shown above can be avoided by using a DMM to adjust the setpoint.

The Analog Timer Module can be set from 0- 30 minutes. If out-a remains high even after set time a out-b alarm goes on to sound a buzzer and flash a LED light.

The Timeless Performer 555 Chip

The Incredible 555 : Here are some 555 circuits, The most versatile and simple chip of all time !

Some of my 555 Circuits are at my blog - 555-Circuits - delabs Schematics

The best part of the 555 is that it has an voltage detection. It has a Versatile Logic which is defined by voltage comparators. The ability to loop it like an opamp for feedback makes it the first "Programmable" Mixed Chip. In short it make an ideal building block.

555 The most Incredible Chip - At my Learning-Teaching Blog Solderman Basics.

Signetics made the 555, This is one IC that is like a E-LEGO, this along with Op-Amps and other components can make many interesting projects. On some pins like Control Voltage it responds to analog signals and on Reset and Output the signals are Digital like. The 7555 a CMOS version consumes lower power and oscillates at higher frequencies.

555 Timer Circuits at delabs



555 Timer based Circuits

• Pulse width modulation using 555.
• Fixed frequency variable duty cycle 555.
• 555 watchdog for uC and uP systems.
• OR gate with two 555.
• Drive SCR thyristor with 555.
• LM555 Voltage Doubler.
• 555 based Reset Generator.

delabs PDF Circuits

I am now Organizing and Updating my main product design sections. Many Useful Websites and Nice Firms have gone over the last few years. I had to update to remove many broken links and improve navigation. These parts of my websites partially represents my Test-Measurement and Instrumentation firm i ran for some years. It also contains many of my designs and circuit innovations from my early days.

2020 -  The HTML pages are now Responsive from Computer Tablets, Notebooks to Large Monitors. All sites are SSL means https: Private and Secure.

delabs PDF Circuits

In 1999 most of my circuits in the OrCad and PDF Formats were uploaded as zip files in free websites of Netscape and Tripod. Then i got suggestions, Feedback and Thank you letters from all round the world. Later some support, encouragement from enthusiasts and engineers in the US and Europe made me improve the Websites "CMS" and content organization. I am now updating my Plain old HTML Pages for the 4th time in 15 Years.



Some parts of delabs/dapj use the CMS Technologies of The LAMP Stack  that arrived later. The New Tech Blog areas link  many EE firms and Resources all over the world. The tech cladistics i developed and used to organize my content is intensive.

Please note these technical pages are for Electronic Enthusiasts and Engineers around the globe for Reference and to improve basic Design capabilities.

These pages or ideas of delabs technologies and dapj tech cannot be copied, replicated or used for content development online or offline print materials.

Instrumentation and Industrial Design

• Analog Circuits - OpAmp, Signal Condition, Mixed Signal.
• Digital Circuits - Logic, CMOS, Counters, Timers, 555.
• Power Electronics - SMPS, Regulated Supply, SSR.
• Microcontroller - 8051, 8052, OpCodes, Analog Interface.
• Test Measurement - Multi-Meters, Small Test Tools.
• Data Interface - Virtual Instrumentation, Device Networking.
• Custom Projects - Sequential Process Timers, Chargers.
• Hobby Projects - Insulation tester, LED Circuits, Meters.
• Theory Tutorials - Basic Electronics, Instrument Design.
• Electrical Diagrams - Control Panels, Reference Tables.
• Resources - Electronic Firms and Electronic Projects

EE Design Library

This is a curated list of EE Pages from delabs websites and blogs. It is an attempt to organize delabs created ee reference pages in one place.

Analog Product Design - Here are design aspects of circuits using Op-amps and Comparators. Discrete Semiconductor Circuit design like using Transistors and Diodes. RLC parts.

 Electronic Design  - Things related to Electronic Design in all its aspects. That includes the prototyping, mechanical, electrical and PCB. Product Safety, EMI-RFI, Reliability and Robustness.

Embedded Systems - This Section is related to Microcontrollers and Related Resources. Microcontroller, SOC, FPGA, ASIC. From 80C31 to the Latest  chips will be the scope of this section.

Power Electronics - The design of Power Supplies, DC to DC and AC to DC Convertors, SMPS, High Voltage and High Current equipment. Mosfets, Thyristor, Schottky Diodes, Ferrite Magnetics and Chokes are the various components used.

Components Materials  - Electronic Components and Engineering Materials. The parts, kits, tools that are used in designing and manufacturing electronic products. The Mechanical Nuts-Bolts and Raw Materials used in Electronic Manufacturing.

EE Design Library - Electronic Product Design Resource.

Measurement is everything, and an Oscilloscope is a EE Stethoscope.

delabs Technologies - Product Design - Industrial Automation and Instrumentation. delabs Technologies uses the brand names delabs and dapj in its Web Services and Resource Sites. These together form an Electronics Informatics and Product Design Technologies Web Consultatory.