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Electronic Night Light - This circuit for an electronic night
light was submitted by Adam from Canada. I have provided the notes [Andy
Collison's design]
Electronic Transformer Dims Halogen Lamp - 05/11/00 EDN-Design
Ideas.....(jkj0 Switched-mode power supply for a halogen lamp, commonly
known as an electronic transformer, is a clever and simple device which
can be enhanced with dimming control..... EDN is migrating links. This
link is not verified. Google the "title" EDN for new link.
Emergency Backup Lamp - This back-up lamp stays off as long as light falls
on the CdS photocell from either the NE-2 or from room ambient light. So, if the power
fails at night, the lamp will light. The 6 volt lamp should be directed away from the
photocell.....(electronic circuit added 7/03)
Emergency Light - A simple circuit that activates a light when the
power is out. A version with a lightbulb and another with white LED light
included….
Emergency Lighting Systems & Battery Powered Fluorescent Lighting -
Zetec Semiconductors Applications Notes An overview of the principles
behind typical emergency lighting systems, fluorescent tube behaviour, and
the requirements of the transistors for efficient voltage inversion. The
note also includes two "Royer" based designs for low voltage systems.
(app note added 2/06)
Emergency Strobe Flasher Generates 250V - 08/05/99 EDN-Design
Ideas.....Figure 1 shows a complete circuit for an emergency lamp that operates from a
12V automotive battery. The xenon flash tube requires a 250V-dc anode voltage and a
4-kV trigger pulse. To generate the 250V dc, IC1, [Design Idea by Jose Luis Arce,
Tecnosuma Havana, Cuba]
Expandable 16 Stage LED Sequencer - The circuit below uses a hex Schmitt
Trigger inverter (74HC14) and two 8 bit Serial-In/Parallel-Out shift registers
(74HCT164 or 74HC164) to sequence 16 LEDs. The circuit can be expanded to greater
lengths by cascading additional shift registers and connecting the 8th output (pin 13)
to the data input (pin 1) of the succeeding stage. A Schmitt trigger oscillator
(74HC14 pin 1 and 2) produces the clock signal for the shift registers, the rate being
approximately 1/RC. Two additional Schmitt Trigger stages are used to reset and load
the registers when power is turned on. Timing is not critical,..... [Bill Bowden]
Experimental Cross Fader - ideas to modify simple rotary light dimmers to
make a cross-fader (added 4/02)
