Content Map

Analog Circuits

Temperature Measurement and Control.
Instrumentation Circuits.
Industrial Process Control Circuits.
Analog Circuits added after 2004

Microcontroller

Microcontroller

Microcomputer Circuits of the 90’s
Interface a 89C51 to ICL7135 A-D 4-1/2.
80C39 based industrial process controller.

Embedded Microcontroller Links

MCS48 Code for 80C39 Microcontroller

Tools

Test Measurement

DMM or digital multi meter

LM3914 analog display, resistance measurement.
Analog and 3-1/2 digital display for +/- 199.9mV.
Power supply with battery backup for DMM.
DMM range and AC-DC mode, logic control.
AC conversion and continuity buzzer test.
Voltage  measurement attenuator amp.
Current Shunt Amplifier with digital control.
Resistance measurement with Current Source.
Analog Buffer and Inverter Switching with logic.

Low cost Dial AVO meter.
 
Low cost Dial AVO meter. Amps Volts Ohms.

Hobby DIY

Hobby DIY Circuits

insulation tester - tera ohm meter
High Resistance Indicator.
Digital Potentiometer.
Function Generator using ICL8038.
Battery Level Indicator.
Optical Obstacle Switch.

Electrical

Electrical Diagrams. 

Control Panel Diagrams.
Mains Voltage Stabilizers.

Design Service

Open Source Projects 2004-2006 - delabs

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

Discussion of Sequential Timer - A
Discussion of Sequential Timer - B
Sequential Timer Specs.
Two Stage Sequential Timer.
Li-Ion Battery Charger.
Electronic Circuit Links

New Posts

Diode Thermometer
Voltmeter Attenuator Rectifier
Dual Power Supply
Voltage to Current Convertor using LM723
Tubelight Electronic Choke
Single Chip dual power supply
Blind Temperature Controller
Battery Backup for Microcontroller
Millivolt Circuit ICL7129
FET Current Source
LM555 Voltage Doubler

RTD PT100 Transmitter
Mini RTD Pt100 Three Wire Transmitter
DPM based on ICL7107
80C51 Operating System
Build a Digital Random Dice
Simple WorkBench Dual Power Supply

Custom Search

Winnowing Magpie 
Cyber Chimp 
Design Gopher 
Hobby Hound 

Digital Circuits
Digital Timers and Counters.
Digital Circuits of the 90’s
Digital Circuits added after 2004

Circuit Archives Links

Power

Power Circuits

Power Electronic Circuits.
Power Supplies Section.
Solid State Relays - SSR.
High Energy Circuits.

DC Load DC Control Solid State Relay.
DC-AC Solid State Relay or SSR.
NO AC Load SSR with DC control.
PCB AC Load SSR with DC control.
NC AC Load SSR with DC control.
AC-AC Solid State Relay or SSR.

Regulated High Voltage Power Supply
Switching Battery Charger with L296

Power Electronics Links 

Tutors

Electronic Theory

Tutorials on basic electronics

Product Development Fundamentals.
Design of a Constant Current Source.
Optical Proximity Switch.
Design of a Thermocouple Amplifier.
Design of a ADC Interface, Microcontroller.
Basics of Electronics.
Electronic Product Production.
Precision Attenuator Amplifier.

Interactive tutorials - digital electronics

Digital up down counter CD4029
Astable 555 Timer
Running lights with CD4017 

Computer Data Interface

Computer Data Interface

Analog Interface for PC Ports.

ICL7135 to Printer port 4-1/2 DVM.
Milli Volt Source for Printer Port.

Control Interface to PC Ports.

Simple Printer Port Interface, Input-Output.
Test Circuit for Logic Analyzer software.
Printer Port, 256 Relays - 16K Dot Matrix.
Byte Blaster Clone for use in Quartus

delabs

Design Service
Contact delabs
Search delabs

Link to delabs
Useful Electronics Links
More Electronics Links

Gadgets
Preset Digital BCD Counter
LED Running lights CD4017
Astable Multivibrator with 555
Digital Clock Gadget 
Alarm Clock Gadget 

Applications

Diagrams and Docs product photos, circuit scans.
delabs News  updates, information and news.
Resources extension of links section.
delabs Projects  Product design Community.
Amps Volts eMag  Interactive Magazine.
Codes delabs

Weblogs

Schematics of delabs
Solderman’s Basics
Hyper Embedded
Components Materials
Electronics News
 Elex Quna
delabs Circuits updates