Electrician Tool – Continuity Tester

I had gone to buy some long wires at a electrician shop, when a terminal box had to be tested, he used a continuity tester.

When i used to buy electrical parts in the past, they used a tester box, made of wood. This had a bulb and a tubelight starter and two long wires (230v AC). The Continuity tester would light up a 40w lamp. Now he had a LED based one, so i got one for myself.

Electrician Tool - Continuity Tester

All it had, was two small cells in a plastic box with a LED, i was just flashing the LED as it looked nice thru the transparent box, it failed. The LED had burnt, the battery used. This product was not for monkeying around.

Now i performed a tiny design upgrade, I used a extra-bright 3mm Red LED with a 47 ohm resistor. Now it is robust, at least for continuity. The battery life can be good only if you make quick checks.

Improvements –

More protection may be needed to avoid damage to LED when this tester is applied across a battery by mistake. LED can flash to save battery power, one SMD – LM339 can be used for flashing and a more efficient short-leakage detector. A small oscillator with a neon may be more efficient and bright. This can also double up as a hidden Live wire or Mains AC detector.

Continuity Tester Circuit

A single chip metal detector with a range of a few inches. This is useful for detecting nails or screws in walls and floors, or for locating buried mains cable.

Continuity Tester

This article describes a simple continuity tester, based on an ATtiny85 and a piezo buzzer, designed for checking circuit wiring, or tracing out the tracks on a PCB:

Electronic Fifteen LED Roulette

The following was submitted on July 11th, 2007. Message: I want to combine Ne555 with 74154 IC.The indication of the outputs must be shown with LED’s but up to so far it need 15 outputs ,is it possible the way i did? if not i will need your assistance

Mail from CY

LED running lights are used to decorate Christmas Trees, Festival Surroundings and even  Buildings. A Clock and a counter are basically required. Many LEDs can be used in parallel with driver transistors. Upto 15 count is is good enough. Many colors can be used and with a PWM or VCO you can make it Audio or Music effects lights like strobe lights.

Electronic Fifteen LED Roulette

Electronique Réalisations – Roulette

Multi-Colored LEDs and drivers and even PIC microelectronics with Visual Effects in the form of ROM tables can make Alphabets and Numbers appear in LED arrays. Some have made Mini Ocillosocpes and Toy Spectrum Analyzers too in LED DOT Matrix Arrays.
LED Sequencer Circuit

The above circuit is another variation of a basic LED sequencer circuit. Note again the use of the 555 as a clock. The 555 is likely one of the most versatile chips ever invented. The output of the 555 is coupled to a 4017 Decade Counter Divider another very widely used chip

555 and CD4017 Running Lights

delabs

Proto-PIC – Prototyping for Hobbyists

eShop and How-To Videos for anyone who has an interest in Microcontroller Programming & Development. Components and Kits for the Electronics Enthusiast.

Proto-PIC – Prototyping for Hobbyists

A site designed for electronics and prototyping hobbyists and enthusiasts. This site has grown and is now a useful knowledge base and online shop for anyone who has an interest in Microcontroller Programming & Development or for anyone who has a love of electronics.

BBC Microbit

BBC Microbit – Accessories, Board & Kits for the Micro Bit

The BBC micro:bit is a tiny little computer, that is easy to program and small enough to fit in your pocket. It has built in Bluetooth , motion detection, a  compass,  and an LED display.  We manufacture our own range of micro:bit Accessories and Kits right here in sunny Scotland.

RelChron Limited
Unit 17, Kirkcaldy Enterprise Centre, Myregormie Place, Mitchelston Industrial Estate
Kirkcaldy, Fife, Scotland, KY1 3PF

PIC Microcontroller Tutorials

These are Tiny Chips that integrate the Microprocessor and Peripheral chips in a compact size with low power consumption. PIC Microcontrollers from Microchip are the evolved computing digital devices that go into many gadgets and intelligent equipment. These are easy to program and reprogram and even protect your code or IP.

The PIC has the math power. The memory, the I/O ports are integrated in the chip like 8051. Some may remember that Microprocessors like 8085 and Z80 had all these functions in chips outside and used to consume more power. Then came CMOS and better IC technology. The 8051(now avr, atmega)and PIC Micro are entire boards in one chip.

PIC microcontrollers for beginners too – Author: Nebojsa Matic

The above tutorial gives the History of computers, microprocessors and the details of PIC Micro’s Internals.

”..what microcontrollers are and how they operate. Numerous illustrations and practical examples along with a detailed description of the PIC16F887 microcontroller will make you enjoy your work with PIC MCUs.”

PIC Microcontrollers – Author: Milan Verle

PIC Tutorials and Gooligum baseline and mid-range PIC training and development board.

PIC Training Course

Gooligum PIC training board

Introduction to PIC Microcontrollers,Baseline PIC Architecture and Assembly Language, Baseline PIC C Programming, Mid-range PIC Architecture and Assembly Language – Quite a few are free and can be read online.

Starting with PICmicro controllers by Wouter van Ooijen. PICmicro is the brand name for a family of microcontrollers manufactured by Microchip. The PIC acronym stood for Peripheral Interface Controller, but recently Microchip has renamed their chips to PICmicro. Within this family the flash-microcontrollers (16×84, 16f62x, 16f87x) are ideal devices for hobbyists and low-volume professionals.

Learn to program in C with FED – This manual will take you through the process of learning C from variables through constants to pointers and then structures and unions. Most of the examples are standalone and are as small as possible to enable the purpose and effect to be easily understood.

Programming and Customizing PICmicro – Myke Predko