Understanding silicon circuits: inside the ubiquitous 741 op amp

Ken Shirriff’s writes, “The 741 op amp is one of the most famous and popular ICs with hundreds of millions sold since its invention in 1968 by famous IC designer Dave Fullagar. In this article, I look at the silicon die for the 741, discuss how it works, and explain how circuits are built from […]

App note: Hardware security ICs offer large security returns at a low cost

An application note from Maxim: Hardware security ICs offer large security returns at a low cost In the face of security vulnerabilities in health and safety applications, governments and industry leaders have focused on security weaknesses in the design and protection of electronic devices. This article explains how using hardware security ICs dramatically reduces the risk […]

Madparts, the functional footprint editor

Here’s an open source functional footprint editor the Madparts by Andete, that is available at github: Being somewhat annoyed with the cumbersome task of creating footprints for ICs I decided to make my own program for it two months ago. Last Friday I finally released version 1.0 as fully open source software Via the forum.

7-channel relay and inductive load sink driver ICs

Uwe tipped us to Texas Instruments’ low power 7-channel relay and inductive load sink driver ICs: TI offers two rather new low power 1,8V & 3.3V & 5V 7-channel relay and inductive load sink driver ICs: – ULN2003LV (Output/Switching Voltage max. 8V – e.g. for 5V relays) – ULN2003V12 (Output/Switching Voltage max. 16V – e.g. […]

Bus Pirate: MMA7456L three-axis accelerometer

Starlino used the Bus Pirate to explore a Freescale MMA7456L, a three-axis accelerometer with both I2C and SPI interfaces. The surface mount chip is on a homemade though-hole breakout board, there’s also a tutorial on this handy adapter. You can get a Bus Pirate for $30, including worldwide shipping at Seeed Studio. Adafruit also has […]

Chips: 24AA02E48 I2C EEPROM with MAC address

See the latest version in the documentation wiki. The 24AA02E48 is an I2C EEPROM with 256bytes of data storage. It’s similar to other EEPROMs we’ve looked at in the past, but this chip has a 48bit EUI-48 ethernet MAC address permanently burned into the upper-most six bytes. This is an easy and cheap way to […]