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MCM Electronics Daily Deal and Bulk Bargain

Real vs. Fake Audiophile Op-Amps: OPA627

Posted March 25, 2016 by Chris

"Walking around ebay I noticed insanely cheap OPA627’s. It’s rather old, popular and high-quality opamps, often used in audiophile gear. Manufacturer (Texas Instruments / Burr Brown) sells them 16-80$ each while on ebay it’s cost was 2.7$, shipping included. Obviously, something fishy was going on. I ordered one, and for comparison – older one in metal can package, apparently desoldered from some equipment. Let’s see if there is any difference."

eLearning Series: Getting started with CPLDs

Posted March 3, 2016 by Chris

"Here you will find links to all the articles that make up our CPLD for beginners guide. We’d love to hear your feedback about this guide. If we’ve got something wrong or if there’s anything specific you’d like us to cover, please don’t hesitate to get in touch."

Prankophone with Synthesizer

Posted February 11, 2016 by Chris

"Prankophone is a sound object being a hybrid of synthesizer, telephone and logic module. The main principle of the object’s functioning is as follows: depending on the current mode, the apparatus calls to random or pre-defined recipients and plays them algorithmic melodies created from their phone numbers. The speakers transmit both the synthesized sounds and the sound from answering person."

Comparing Different Types of Capacitors

Posted January 29, 2016 by Chris

"Capacitors are filtering devices with are used abundantly in electronic circuits and applications. There are many different types of capacitors. We will discuss some of them in this article."

PWM Halogen Lamp Dimmer

Posted January 15, 2016 by Chris

"High Current PWM Halogen Dimmer controller project is designed around SG3525 IC and High current MOSFET. Project can handle lamp up to 5 Amps (10Amps Possible with big heat sink) and supply 12-24V DC .Ideal for Halogen Dichroic Lamp or Halogen Lamp."

Gate Level Hardware Random Bit Generator

Posted January 9, 2016 by Chris

"These are some notes about building a hardware random bit generator. Johnny von Neumann once said that anybody who contemplates arithmetic methods for the generation of random numbers is in a state of sin. What he meant by that is this: if you try to generate random numbers using only software, the results will necessarily depend on the state of your machine at the outset of the process, and are therefore insecure. That is, somebody could conceivably reconstruct your allegedly random bitstream. "

Electrostatic/Smoke Precipitator – A Simple One

Posted December 8, 2015 by Chris

"A smoke precipitator, or an electrostatic precipitator, is a device which removes smoke or other particles from the air using high voltage electrostatics."

The Occam’s Microcontroller

Posted November 18, 2015 by Chris

"’Occam’s Microcontroller’ is my article in the Autumn 2013 edition of the G-QRP Club’s ‘SPRAT’ Journal – and the subsequent presentation at The G-QRP Club’s Rishworth QRP Convention, 26th October 2013. This page exists to provide supporting resources for the article (and for subsequent presentations associated with it). These resources include code, schematics and PCB design files."

Build A 3D Printable Toy Platform

Posted October 21, 2015 by Chris

"The modular robot or toy platform is essentially built off of a chassis that enables the user to add any number of 3D printed toy housings to it ranging from the aforementioned bulldozer, tank, digger toy or anything else that a user wants to program it as using the code that was generously provided by hobbyman."

FreshRoast SR500 Teardown

Posted September 29, 2015 by Chris

"This article will explain how to teardown a FreshRoast SR500 roaster and probably an SR300 as well. If you are looking to modify an SR500 the following content will be useful as well. It will include technical information about the components that make the SR500 work and suggestions of where modifications will need to take place if you wish to split fan and heater control to external dimmers, VARIAC devices, or otherwise control your SR500 with a Microchip PIC, Arduino, or other microcontroller or PID controller device."