Hobby Projects - Insulation tester, LED Circuits, Meters.

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