In the previous part we have familiarised with the scheme of the four channel PWM controller, have considered principles of work and the basic characteristics of the device. All of the ATMega32 software was written in assembler within the AVR ...
08-02-2010
Pulse width modulation (PWM) is a useful control technique for such applications as light dimming and motor speed control. The aim of this project was to design a low cost PWM controller that would be useful in many areas where PWM is employed. The ...
01-02-2010
Circuit : Andy Collinson Description: This is a single channel (on / off) universal switch that may be used with any Infra Red remote control using 36-38kHz. (This is a very common remote handset frequency). In place of IR1 a TSOP1738 receiver may ...
30-01-2010
Circuit : Andy Collinson Description An electronic version of a chirping canary. May be used as an alarm, a sound effects generator or perhaps a replacement doorbell. Circuit Notes This circuit is a modified hartley oscillator with a couple of ...
29-01-2010
John Samin The original diode in the Microwave detector has been hard to find. I have found a supplier for the diodes... Purchased here: http://www.xs4all.nl/~barendh/Cateng/Cateng_diode.htm Site Main Page : ...
26-01-2010
Adding a cheap LCD to your PC is a popular diy project for many beginners in electronics. The parallel port however, is dead. It's obsolete. It's big...ugly and just awful. The solution? Add a USB interface to your existing LCDs. The circuit ...
15-01-2010
Simulators for Calibration and Alternative Barometer Designs The design presented in the schematic above is not the only possible barometer that can be constructed with this printed circuit board. Not only is the printed circuit board designed to ...
12-01-2010
David W. Bray This article describes details for constructing a 1-Wire Barometer which will work on a Dallas Semiconductor Corporation 1-Wire network. It differs from the popular Version 1.1a in that it has more than twice the resolution. As with ...
10-01-2010
UPDATE 05/17/07 Here is a photo of me setting up the wind turbine on my remote property during our May 2007 trip to Arizona. I had left most of the equipment on-site in Arizona. I only brought the turbine head and charge controller back home with ...
25-12-2009
AD630
Generate a pair of quadrature-phase digital signals. Stefano Salvatori and Marco Girolami The circuit in this Design Idea realizes a simple, low-cost lock-in amplifier employing an Analog Devices AD630 balanced modulator-demodulator IC (Reference ...
24-12-2009
Jerry Wasinger I. Introduction In the Midwest, the main topics of conversation may include the local football team or how the crops are doing. Inevitably though, the conversation always leads to the weather. Most of us take the weather for granted ...
22-12-2009
Jim McLucas When you need a precision peak detector, you would usually implement it with one or several op amps and a few other associated components. This technique usually works well unless your design requires operation higher than a few ...
20-12-2009
Jerry O'Keefe The circuit tracer in Figure 1 is a handy tool for finding connectivity paths on a pc board. Because the sense voltage you use to measure the path is lower than a transistor's V BE voltage, you can use the design in circuits ...
18-12-2009
Here is a simple transmitter that when connected to a phone line, will transmit anything on that line (execpt the dial tone) to any FM radio. The frequency can be tuned from 88 to about 94Mhz and the range is about 200 feet. It is extremely easy to ...
16-12-2009
Miroslav Adzic - Serbia Montenegro Description A fast electronic fuse designed to operate on 230V AC with an adjustable trip current. Click to enlarge Notes When the current through the load exceeds a level determined by the position of the wiper ...
16-12-2009
This web site has become very popular. Thank you all for your interest and encouragement. I am getting tons of email questions from people about all sorts wind power related (and not so related) issues. Many are the same few questions asked over ...
15-12-2009
Miroslav Adzic - Serbia Montenegro Description A novel supply voltage monitor which uses a LED to show the status of a power supply. Notes This simple and slightly odd circuit can clearly show the level of the supply voltage (in a larger device): ...
15-12-2009
Andy Collinson Description An AM portable radio receiver made from the ZN414 IC. The ZN414 ic has now been replaced by the MK484 which is identical in performance and pinout. Click to enlarge Notes: Designed around the popular ZN414 IC this ...
14-12-2009
Andy Collinson Description: A microphone amplifier that may be used with either Electret Condenser Microphone (ECM) inserts or dynamic inserts, made with discrete components. Notes: Both transistors should be low noise types. In the original ...
14-12-2009
Using some shift registers and exclusive OR gates, it is possible to construct what is known as a psuedo random code generator. Depending on what taps are used on the shift register, a sequence of up to 2^n-1 numbers can be generated before the ...
11-12-2009
All
Schematics