Hobby Projects - Insulation tester, LED Circuits, Meters.

Saturday, April 15, 2017

Development boards and Tools - OLIMEX

Designs, prototypes and manufactures printed circuit boards, sub-assemblies and complete electonic products.

Development boards and Tools - OLIMEX

64MB SDRAM, 512MB NAND Flash. Ethernet 100Mbit controller, USB host, USB device, RS232 and 40 pin extension port with all unused SAM9261 ports available for add-on boards. Runs Linux, WindowsCE and other RTOS natively. RTC - 3V Li battery.

SAM9-L9261 Development Platform with ARM9

SAM9-L9261 Development Platform with ARM9

SAM9-L9261 is development platform with ARM9 microcontroller, TFT LCD 3.5" 320x240 pixels with TOUCHSCREEN.
  • MCU: AT91SAM9261 16/32 bit ARM9 180MHz operation
  • On board voltage regulator 3.3V with up to 800mA current
OLIMEX Ltd.
89 Slavjanska St., P.O.Box 237, Plovdiv 4000 BULGARIA

555 and CD4017 Running Lights

This is a Gadget Tutorial for this Article LED Running lights CD4017 - Live Gadget Page.

Red Button Powers LED Running Lights, 555 Clock is counted by CD4017. Adjust R2, See ToolTips. This Demo shows LM555 running a CD4017 Counter to drive Ten Leds sequentially.

Press the Red button below to turn on the circuit press it again to turn off, i have put a new battery and did the wiring for you. The Red LED will flash according to the state of the 555 output at pin 3. The decade counter-divider CD4017 has 10 outputs, for every low to high transition, rising edge, the counter advances one LED. After going one full circle the the first LED lights again and it goes on.....

LED Running lights CD4017

The 10 outputs have 10 green LEDs. The current thru the LED is limited by R1, the current can be calculated like this (9V - 1.6V) / 1K = 7.4mA this is within 20mA which is the danger limit of the CMOS output. You want it to be bright use transistors for every output.

Friday, April 07, 2017

Build Electronic Circuits Like a Pro

If you want to build electronic circuits, you need to connect the components of your circuit somehow. If you expect to make your circuit work more than just a few times, you need a solid way of connecting them. You need to create a printed circuit board (PCB).

"I started playing with electronics as a hobby when I was 14. Since then I have finished a Master's degree and founded two electronic design companies."

Build Electronic Circuits Like a Pro

Build Electronic Circuits Like a Pro

The radar sensor uses a Ultra-Wideband (UWB) chip from Novelda. It sends out electromagnetic pulses and analyzes the pulses that are reflected back. In the video above, a part of the electromagnetic pulse will be reflected back when it hits the wall and a part of it penetrates the wall and is reflected from the cabinet behind the wall.

Radar Circuit Enables See-through Wall Robot

delabs Notes

This is a nice Educational Website built by Oyvind from Norway. Only when we read and learn from the experience and views of others, our brain opens up to new ideas and we develop a wide perspective.

Friday, March 17, 2017

Allied Electronics - Electronic Components Distribution

Allied Electronics is a small order, high service level distributor of electronic components and electromechanical products with 55 sales branches across the United States and in Canada.

Allied Electronics - Electronic Components Distribution
  • Actives & Passives
  • Enclosures & Cooling
  • Switches, Relays & Control
  • Connectors, Wire & Cable
  • Prototyping & Production
Pomona Electronics 72902 - Test Clips Sets

Pomona Electronics 72902 - Test Clips Sets

Kit of 12 Micro SMD Grabbers in 6 colors. Grabbers are designed for easy attachment to SMD chips with pitches down to 0.008" (0.20 mm). Thin yet durable design permits attachment in tight areas.

History of Allied Electronics -

1928: Allied Radio was established as the radio parts distribution arm of Columbia Radio Corporation. The company was soon to become one of the most recognizable names in the electronics industry.

1995: Allied is the first electronics distribution company to come out with a CD-ROM catalog and quickly followed-up by entering the e-commerce arena with the launch of a web site.

Allied Electronics, Inc.
7151 Jack Newell Blvd. S. Fort Worth, Texas 76118 U.S.A.

Saturday, March 11, 2017

Dontronics - PIC and AVR Kits Shop

Dontronics World's largest range of Microchip (PIC) and Atmel (AVR) Hardware and Software. They have many kits for Embedded SBC from small ones to the powerful types that run Linux.

Dontronics - PIC and AVR Kits Shop

Dontronics - PIC and AVR Kits Shop

They supply many boards from Olimex. One is shown here. MCU: PIC18LF8490 16KB Flash memory, 768 B RAM memory, LCD driver, 10 bit ADC, PWM, SPI, I2C, EUSART, TIMERS, COMPARATORS, up to 40MHz operation.

Dontronics is a small family owned business run by Don McKenzie, and operated from Tullamarine Australia. Currently Don is providing product support, and his daughter Penny, is handling all on line sales.

Dontronics
P.O. Box 595 Tullamarine 3043 Australia

Monday, March 06, 2017

FM Remote Speaker System

A high quality, noise free, wireless FM transmitter/receiver may be made using the LM566 VCO and LM565 PLL Detector. The LM566 VCO is used to convert the program material into FM format, which is then transformer coupled to standard power lines. At the receiver end the material is detected from the power lines and demodulated by the LM565.

National Semiconductor Application Note 146 June 1975

The important difference between this carrier system and others is its excellent quality and freedom from noise. Whereas the ordinary wireless intercom uses an AM carrier and exhibits a poor signal-to-noise ratio (S/N), the system described here uses an FM carrier for inherent freedom from noise and a PLL detection system for additional noise rejection.

Carrier System Transmitter

Carrier System Transmitter
Two input terminals are provided so that both LEFT and RIGHT signals of a stereo set may be combined for mono transmission to a single remote speaker if desired. The input signal level is adjustable by R1 to prevent overmodulation of the carrier. Adding C2 across each input resistor R7 and R8 improves the frequency response to 20 kHz as shown inFigure 5. Although casual listening does not demand such performance, it could be desired in some circumstances.

Carrier System Receiver

Carrier System Receiver
The receiver amplifies, limits, and demodulates the received FM signal in the presence of line transient interference sometimes as high as several hundred volts peak. In addition, it provides audio mute in the absence of carrier and2.5W output to a speaker

Friday, February 03, 2017

Franks Electron tube Pages

"At the age of 10 we moved to Copenhagen for about 2 years. I had some friends there who knew that I liked old radios so regularly someone brought me one. (See my picture at the main page) Among them was the Bang & Olufsen - Grand Prix 48 K (photo). I liked this radio so much that I wanted to make it work again. There was not much wrong so I got it working. Later when we were back in Eindhoven, I made so many ......."

Franks Electron tube Pages

Franks Electron tube Pages

Frank Philipse - Waalre, the Netherlands.
  • Tube Number Systems
  • American Substitutes for Foreign Types
  • Foreign Substitutes for American Types
The tube data resides on several mirror sites in several countries and they are exactly equal, except for the Poland site which additionally has been equipped with a tube search.

More about Frank's Experiments

"Back in Eindhoven, there where the 60's. Radio Luxembourg on my B&O etc. I got interest in guitars and amplifiers. I built several Amps. My first amp was something with the EF11 and the EL3. I also built a copy of the Philips EL6431 Amplifier. (That's where the output transformer of my B&O radio went) In Eindhoven there was a repair shop called 'De Radiodokter'. He had some old TV chassis in the display for 5 guilders each. When I had saved enough money, I bought some. Then when I was about 16 I made my first really working TV from these parts."