Simple 12-180V boost converter using the 555 as controller
Posted by News
The most interesting aspect of the circuit is how an ordinary 555 is used to regulate the output voltage. Now, there are hundreds of switched mode controllers ICs on the market which are all better suited for this job than the 555. The problem with all these ICs is that if you build a nice NIXIE clock using them, and at one moment in the future the IC breaks down, it is more than likely that it is already obsolete and out of production. The 555 is (very) cheap, performs well enough and most likely will remain in production forever.
Read More Source:
http://www.dos4ever.com/flyback/flyback.html
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Pulse Width Modulators using LM339
Posted by News
The first example uses the standard op-amp oscillator circuit to generate a triangular waveform which is level-shifted and fed to a comparator (e.g. LM339) to give the PWM waveform. Most people will want to use two comparators rather than one op-amp and one comparator so that is what we show here.
Read More Source:
http://www.4qdtec.com/pwmmod.html
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Four-Channel PWM Controller
Posted by News
Author: John Giffard and Mark Lewin
The highly flexible Four-Channel PWM Controller is designed around the ATmega16L microcontroller. It has an RS-232 serial interface for computer control, a 12-button keypad interface, four 10-bit analog inputs, and an alphanumeric LCD interface (with backlight control). [source]
Four-Channel PWM Controller - [Download Project] [View Abstract]
Tags: controller, DIY, Electronics, LED, pwmRelated posts
AC Motor Speed Control by SCR
Posted by News
This circuit will allow you to control the speed of an AC motor, for example an electric drill. The way that this circuit works is as follows. The bridge rectifier produces dc voltage from the 120vac line. A portion on this current passes through the 10K ohm pot. The circuit comprised of the 10k pot, the two 100 ohm resistors and the 50uf capacitors delivers gate drive of the SCR. The diode D1 protects the circuit from reverse voltage spikes. The ratings of the bridge rectifier and the SCR should be 25 amps and PIV 600 volts. The diode D1 should be rated for 2 amps with PIV of 600 volts. The circuit can handle a load up to 10 amps. The SCR should be very well heat sinked.
Related Links
More circuit about Electronic Control
More Motor Speed Controller
More AC Dimmer Controller
Read More Source:
http://home.maine.rr.com/randylinscott/aug99.htm
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Universal Remote Control Tester - Ubicom SX28 Microcontroller based
Posted by Alan Parekh
If you have ever wanted to make a remote control project, this Universal Remote Control Tester project that uses the Ubicom SX28 Microcontroller could be a good starting point. This chip is now being sold by Parallax.
"This project use the Ubicom SX28 micro controller to made a test of the frequency and the complete wave taken form a IR remote control, could be an TV, Audio, VCR, or any type infrared. It consist of two parts, one is the hardware or the physical tester and the another one is the software.
The output state of the IR sensor will change from one to zero in a TTL level, the circuit will detect only this in the rb.4 SX pin , ( after a power on or reset ) starting at this point the RTCC register in zero, and while the rb.4 pin no change RTCC will increment by one each 16 times clock ( see option register configuration ) therefore 3.2 uSeg for a 50 Mhz clock, ok, while this happened the "veces" variable will increment by one many times as the RTCC produce an interrupt."