By Jim Wilson Allied Healthcare Products Electronic Design Europe Most microcontrollers have a pulse-width modulator (PWM) output that can effectively drive variable output loads such as proportional solenoid valves, motors, or light dimmers. You ...
13-05-2012
MiniLA is a project of simple and cheap logic analyzer designed for amateur and semi-professional work. Features: Up to 32 channels 128 Kb of memory for each channel Sampling rate up to 100 MHz (timebase in 1-2-5 sequence) External clock input ...
13-05-2012
Vladimir Oleynik, Moscow, Russia EDN The added output has its own voltage regulation Designers use step-up-converter ICs in battery-powered portable equipment. These chips usually provide one output with a fixed or an adjustable voltage. Some chips ...
27-04-2012
This project didn’t look complicated but it was. The MCU part is really simple: just some code for the Display, Keypad and DDS Communication. A DDS AD9833 from Analog Devices is a chip that is driven by a hi-frequency oscillator. I used a 50 ...
23-04-2012
Luca Matteini, Agliana, Italy; Edited by Paul Rako and Fran Granville -- EDN You can get isolation with low power consumption using this simple circuit The circuit in this Design Idea generates a zero-crossing pulse off the ac mains and provides ...
17-04-2012
Part 1 - Specifications and Schematic The data is recorded as the Comma Separate Value (CSV) file to the SD/MMC memory card. The interval between sample is programmable from 10 secs to 60 mins. The optional digital input signal, pulse, and ...
13-04-2012
Build a lab-grade data logger with PIC microcontrolller and a 20-bit delta-sigma converter. A new design of a lab-grade data logger has been developed using a PIC microcontroller and a 20-bit delta-sigma converter. The data logger provides ...
08-04-2012
This experiment shows how to turn LEDs into light sensors. Since the Blinkenlight Shield has 20 of them this turns the Blinkenlight Shield into a 20 pixel „camera“. Schematics Before I explain why the schematics got their current form ...
06-04-2012
Jordan Dimitrov, Toronto, ON, Canada Design Idea reveals a VFC (voltage-to-frequency converter) circuit that provides good performance at a low price. You can obtain all of the parts for a few dollars from a local electronics shop. Figure 1. Three ...
03-04-2012
William Grill, Riverhead Systems, Greeley, CO; Edited by Paul Rako and Fran Granville -- EDN An eight-pin micro multiplies, monitors, and delivers a boosted voltage to a load The circuit in this Design Idea uses a Microchip PIC12F510 controller to ...
30-03-2012
Part 1 - Schematic Part 2 - Construction Notes, Fan Types and temperature sensors A new version (v1.1) of the Windows desktop application is available. The significant differences from the first version (v1.0) are: A new menu item (Program ...
15-03-2012
Part 1 - Schematic Buck Converters This is a simple buck converter design and the output contains a lot of switching noise and is not very linear with respect to the control signal. This does not matter as a fan is just an electric motor and does ...
15-03-2012
The Intelligent Fan Controller is designed to control the noise generated by the fans inside your computer. It does this by varying their speed based on temperatures measured inside the case. When it is cool the fans will run slowly and they will ...
15-03-2012
John Lo Giudice, STMicroelectronics Eliminating excess noise from an oscilloscope probe yields better measurements You must minimize noise when measuring ripple in power rails because the ripple’s amplitude can be low. Oscilloscope probes are ...
12-03-2012
Zoltan Gingl, Katalin Kopasz, Hungary Cornell University Abstract A very low-cost, easy-to-make stopwatch is presented to support various experiments in mechanics. The high-resolution stopwatch is based on two photodetectors connected directly to ...
07-03-2012
Jefferay Lawton, Microchip Technology Varactor (or “varicap”) diodes are used primarily in radio-frequency (RF) circuits to provide a capacitance that can be varied by changing the applied voltage. These types of diodes often are used ...
29-02-2012
This project describes an easy and inexpensive way of adding a digital thermometer and data logging feature to a PC. It involves a PIC microcontroller that gets the surrounding temperature information from the Microchip MCP9701 sensor, and sends it ...
27-02-2012
Vassilis Serasidis Introduction This mini Logic analyzer is a tool for you to watch on LCD the logic transitions 0 or 1 of a digital data signal. A digital data signal can be found on the output pin of TSOP-1736 Infrared Receiver, on the Transmit ...
26-02-2012
Shyam Sunder Tiwari It generally isn’t safe to connect programmable logic controller (PLC) and industrial sensor outputs directly to microcontrollers that need transistor-transistor logic (TTL) or CMOS signals, which can make such sensors ...
23-02-2012
Part 1 - Theory Part 2 - Schematic, Firmware for the PIC microcontroller to initialize the GLCD In the first part of this tutorial, we discussed about Winstar’s WDG0151-TMI GLCD module, which is a 128×64 pixel monochromatic display ...
10-02-2012
