A current-sensor would be useful in a lab power supply. This app note is about chaining two current-sense chips to use at high voltages: [via]
Using a transistor as shown, you can double the allowed voltage limit on a current-sense amplifier by stacking two such amplifiers one upon the other. The voltage signal from the bottom amplifier then represents current as the voltage across the sense resistor, times the product of the gains of the two amplifiers.
App note: Extend range of current-sense amplifiers – [Link]
dangerousprototypes.com writes: [via]
Beth from scanlime has posted a detailed explanation of her development of an S/PDIF encoder object for the Parallax Propeller.
The source code is open under an MIT-style license. If you’re a Propeller enthusiast it should be easy to implement this code to give your next sound project a digital output. Beth hopes that this code will inspire non-Propeller users to explore digital audio on a different microcontroller platform!
S/PDIF Digital Audio on the Parallax Propeller – [Link]
EDN reviewed the Oscium logic analyzer and oscilloscope for the iPhone/centiPad. It uses the Cypress PSoC 3, which is a CPU+FPGA hybrid. Cool tech, but too closed and pricey for us: [via]
The $297.99 device comprehends one analog and four digital channels, touts 5 MHz analog bandwidth and 12 million sample/sec specifications
Oscium iOS oscilloscope review – [Link]
Here’s a video of Jeri Ellsworth’s latest project for element14, a shooting arcade game using the MachXO2 CPLD. The game is simple in principle: use an LED light gun to shoot the light sensors representing the bad guys when they appear at windows in the target house. The implementation is more challenging, with the heavy logic being handled by Jeri’s homebrew MachXO2 CPLD board, with National LED drivers and motor drivers.
This is a game prototype, so no code or schematic yet.
Shooting arcade game using CPLD – [Link]
TLC59108 I2C controlled LED driver. [via]
The TLC59108 is an I2C bus controlled 8-bit LED driver that is optimized for red/green/blue/amber (RGBA) color mixing and backlight application for amusement products. Each LED output has its own 8-bit resolution(256 steps) fixed-frequency individual PWM controller that operates at 97 kHz, with a duty cycle that is adjustable from 0% to 99.6%. The individual PWM controller allows each LED to be set to a specific brightness value. An additional 8-bit resolution (256 steps) group PWM controller has both a fixed frequency of 190 Hz and an adjustable frequency between 24 Hz to once every 10.73 seconds, with a duty cycle that is adjustable from 0%to 99.6%. The group PWM controller dims or blinks all LEDs with the same value.
TLC59108 simple 2-wire LED driver for color mixing – [Link]
dangerousprototypes.com writes: [via]
Nanode is a low cost Arduino-like sensor node board intended for web connectivity applications. It allows you to develop web based sensor and control systems – giving you web access to six analogue sensor lines and six digital I/O lines. The schematic and other details can be found on the project’s Thingiverse page. The code can be found here.
This is an open source project conceived, designed, manufactured and coded by London Hackspace members.
Nanode: networked Arduino node – [Link]
I made this circuit to support the backlit of my Servo Actuated Keycode Lock project. I wanted to add backlit to the touchpad, but the LEDs should turn on only if the ambient light is not sufficient. The project runs on batteries so the current consumption is critical. The door is located in front of an East window, so there is enough light during day. Only during night the backlit is necessary.
Automated Light Controller with adjustable Sensitivity and Hysteresis – [Link]
Dave Jones from the Electronics Engineering Video Blog shows us what tools he recommends for a starter electronics lab. He makes a few surprisingly inexpensive recommendations for multimeters, oscilloscopes, function generators, bench power supplies, soldering stations, and many other tools and supplies. I, for one, am taking very careful notes on this excellent video since I’m moving from basic to more advanced electronics design. [via]
How-To: Set Up An Electronics Lab – [Link]