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Schematics of delabs

Electronics Circuits

Here you will find some of the product and circuit designs of delabs. Some are Educational, Generic and few others are related to Application Notes. Electronics Circuits is the new face that is representing the older archive Electronics Circuits Archive. This archive was built as early as the Nineties  ..  means 90s, when the web was growing at a fast pace. Donate to delabs to help improve and maintain our services. Contact delabs.


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Your activity must be related to Industrial Products, Firms, Engineering, Technologies, Electronics or Hobby DIY. The community is focused in Electronics Industrial Engineering and Technologies. Hobby Electronics and Learning Electronics.

This website useful for Engineers, Firms, Electronic Enthusiasts. Students and Ham Radio. If you have used a Soldering Iron or Multimeter, you qualify. If you understand Diodes and Resistors you are most welcome.

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About delabs

Creative Work, ideas and documents of delabs can be used for Product Design and Development by R&D Engineers, Hobbyists, Students and even firms for creating useful products. These cannot be used for reprint, replication or publishing online or offline.

About dS EC

History – delabs designs and notes are from the Engineering Records of delabs since the late 80s. delabs published some circuits online in 1999 in the web spaces provided free by netscape and tripod. delabs websites in its own hosted space and domains happened after 2001.

delabs Circuits – Circuit and product design archive. Most of delabs circuits, projects and docs can be found here delabs Content Map it also has the blogs and other services.

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Circuits of delabs

Tech Blogs

These are Tech Blogs i maintain to jot products and services of various firms in relation to Electronics Product Design and Development. You will also find here some of my product and circuit designs. Some of my design, manufacturing experience and learning notes too are being recorded.


The new responsive HTML pages of the Electronic Designs are preserved as a reference for Firms, Engineers and Enthusiasts. Most of the designs are related to my own creations for my Manufacturing Firm in the 90s. The Web and the Electronics world is much different now, but the product design and circuit design basics remain the same.

Circuits Archive

Instrumentation and Industrial Design
  • Analog Circuits – Opamps, Comparators, Small Instruments, Mixed Design Circuits.
  • Digital Circuits – Logic Circuits using 74 and 40 series of TTL and CMOS Chips.
  • Power Electronics – Power Supplies, SMPS, Switching Supplies, Inverters, Energy.
  • Microcontroller – 8051, 8951. Analog Interface, Single Board Computer. Firmware.
  • Test Measurement – Basic DMM, Insulation Tester, AVO Meter, Small Tools.
  • Data Interface – Printer Port Interface. Serial Port Circuits, Virtual Instruments.
  • Hobby Projects – DIY Projects for a Lab. Basic Transistor Circuits for Learning.
  • Custom Projects – Custom Design Examples including specification development.
  • Theory Tutorials – Learning Electronics, Instrumentation and Industrial Controls.
  • Electrical Diagrams – Control Panel Diagrams, Industrial Automation Designs.

From the feedback i have got since the 90s, these sites and pages of delabs have helped many product design engineers and companies.