|
|
|
Two Transistor LED Flasher - This 1.5 volt led fasher runs more
than a year on a single 'd" cell and alternately flashes 2 LEDs at about a
1 second rate. The circuit employs a 74HC14 CMOS hex inverter that will
operate at very low voltages (less than 1 volt). One section is used as a
squarewave oscillator (pins 1 and 2), while the others are wired to
produce a short 10mS... [Bill Bowden design this one] |
|
Two Transistor LED Flasher - This is a classic 2 transistor
astable multivibrator. Many other NPN small signal or switching
transistors can be used, including 2N4401, PN2222 or 2N2222 using the
circuit on the left. The circuit can also be inverted using PNP
transistors such as 2N3906, 2N4403, PN2907, or 2N2907... [from Bill's
Electronics Reference Library] |
|
Two Wire DC Lamp Dimmer replaces Rheostats - 10/23/97 EDN-Design
Ideas.....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 the instrument
panel...... [Design Idea by Kevan O'Meara, KO Systems, Chatsworth, CA] |
|
|
|
Two-wire Lamp Flasher (redcircuits) - This circuit has been designed to
provide that continuous light lamps already wired into a circuit, become flashing.
Simply insert the circuit between existing lamp and negative supply. Especially suited
for car or panel pilot lights, this device can drive lamps up to 10W(design added
11/06) |
|
Typical 120 Volt AC Dimmer Circuit - This is the type of common light dimmer
widely available at hardware stores and home centers. The circuit is a basic model for
light dimmer for120V AC voltages. This basic design can handle light bulbs at
power range of around30W to few hundred watts (depends on construction). (added 2/03)
|
|
Typical Strobe Light Trigger Circuit - 555 based Timing circuit which
triggers a SCR which controls the trigger transformer (added 4/02) |
|
Ultra-Bright LED Lamp - ..... |
|
Ultracapacitor powers bicycle light - 09/28/00 EDN-Design Ideas.....The
circuit in Figure 1 represents a simple and inexpensive way to provide additional
bicycling safety. A conventional bicycle-generator lighting system works with the
circuit to provide safety lighting for several minutes after the bicycle has stopped.
Energy storage uses an ultracapacitor rather than a battery to avoid the typical
battery problems of limited life..... [Design Idea by Dennis Eichenberg, Parma
Heights, OH] |
|
Universal Input Linear Fluorescent Ballast using the Ir2166 - The IR2166
Demo Board is a high efficiency, high power factor, fixed output electronic ballast
designed for driving rapid start fluorescent lamp types. The design contains an EMI
filter, active power factor correction and a ballast control circuit using the IR2166.
(added 3/05) |
|
Use a CFL ballast to drive LEDs - 26-Apr-07 Issue of EDN A CFL ballast
can drive a string of as many as 64 LEDs..... [Design Idea by Christian Rausch,
Unterhaching, Germany] |
|
Using a Light Dimmer IC for AC Motor Speed Control - This circuit example
uses LS7231 Light Dimmer IC (added 6/06) |
|
Using The 555 Timer With Photocells - This page shows three circuits for
using the 555 timer IC as a photocell controlled train detector.
Scroll down for this circuit design…..Circuit for model railroad trains…. |
|
UV Light Box - Electroinic circuit design…. [from Harry Lythall's website] |
|
|
