|
µC implements Pushbutton Light Dimmers: 06/18/98 EDN-Design Ideas / (added
08/05) A project required building a synchronous-demodulator circuit to track a line
drawn on paper. beauty of synchronous-modulator/demodulator approach is its
inherent noise rejection. method rejects nearly all out-of-band noise, wher from
internal drift or external illumination. This rejection is a boon in optical tracking,
where return signal is inevitably buried in 120-Hz ambient light, amplifier
offsets, and temperature drifts. circuit in Figure 1 is inexpensive, and it
operates from 5V dc. circuit scans eight LED/sensor pairs every 22 msec and
stores result in eight sample/hold (S/H) capacitors for interrogation by a
µP-driven ADC. purpose of circuit is to determine which sensor is above
line. |
|
12 Volt Lamp Dimmer: dimming d1-by controlling duty cycle of a
astable555 Timer oscillator (added 4/02) |
|
12 Volt Lamp Fader (Automatic ): (electronic (schematic / circuit added
11/05) |
|
120 VAC Lamp Dimmer (full wave SCR): (electronic circuit added 10/05)
|
|
120 Volt AC Lamp Dimmer (full Wave SCR) : (circuit added 7/02) |
|
2 Wire DC Lamp Dimmer Replaces Rheostats: 10/23/97 EDN-Design Ideas / (added
08/05) Originally for use in commercial trucks, a low-cost dc lamp dimmer (Figure 1)
can control more than 100W of incandescent panel lighting and replaces a high-power
rheostat, whose heating darkens instrument panel. circuit has several
unique advantages: A two-wire connection means no change to existing wire harnesses,
high efficiency means minimal heat sinking, and a typical circuit costs less than
rheostat it replaces. |
|
230 Volt Dimmer: A reliable and efficient all-around performer. I bought
kit because it didn't cost me much more than components were worth and I also
got a nice professional-made PCB inside. As you can see, this is a tried-and-true diac
& triac combination that offers both simplicity and high performance. With a load up
to 3.5A, power rating is 750W at 230V. A heat sink on triac is a must!
Note: for 110V operation, add a 220k resistor in parallel with 470k pot. No or
modification is necessary. But since maximum allowed current is still 3.5A,
highest possible power output will drop to 380W. (added 11/05) |
|
25-Pin PC Serial Port to MIDI Synthesizer Interface Cable: (circuit /
schematic design added 6/06) |
|
4 Channel dimmer rack: (electronic circuit added 4/05) |
|
8 Bit Digital Light Intensity Controller : (design circuit added 8/02) |
|
A Ballast that can Be Dimmed from a Domestic (Phase Cut) Dimmer.: A system
has now been developed, based around IR2156, where ballast is able to
operate with minimal flicker over a considerable portion of adjustment range of
a dimmer and light output may be controlled over this range from maximum output
down to around 10%. (added 6/06) |
|
ABR-42021 / Control Interface for Standard 0 - 10VDC Dimmers: Fairchild
Application Notes / (app note added 6/06) |
|
AN809: Digitally Addressable DALI Dimming Ballast App.: Microchip Application
Note Published 10-Apr-02 (app note added 6/06) |
|
Ballast that can Be Dimmed from a Domestic (Phase Cut) Dimmer.: A system has
now been developed, based around IR2156, where ballast is able to operate
with minimal flicker over a considerable portion of adjustment range of a dimmer
and light output may be controlled over this range from maximum output down to
around 10%. (added 6/06) |
|
Circuit Delivers Dimming Control for White LED Driver: 10/28/04 EDN Design
Ideas / (added 1/05) The demand for power in color cell-phone handsets is
constantly increasing. New applications steadily emerge, making it imperative to
reduce power consumption in the design. Examination of usage data shows that more than
50% of the power consumed is in providing backlighting for the color screen. People
use the phones for playing games and MP-3s and a multitude of other heavy-duty,
multimedia f... |
|
Circuit optimizes PhotoTransistor Bandwidth : 04/09/98 EDN-Design Ideas /
(added 3/03) |
|
Control Interface for Standard 0 - 10VDC Dimmers / ABR-42021: Fairchild
Application Notes / (app note added 6/06) |
